2020 AIR MONITORING NETWORK REVIEW and 2021 PLAN Final Lead Author: Ceresa Stewart Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 1 of 204 This page left intentionally blank Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 2 of 204 ACKNOWLEDGEMENTS In 2020, the Maricopa County Air Quality Department’s Air Monitoring Division maintained 22 ambient air monitoring sites throughout Maricopa County. Air Monitoring Division team members include: one manager, one quality assurance officer, two technician supervisors, two air quality planners, one management analyst, and thirteen technicians. Maricopa County Air Quality Department would especially like to thank air monitoring personnel and atmospheric scientist for their excellent job in helping to maintain the County’s air monitoring program. Respectively, they are: Ben Davis, Gary Ensminger, Reynaldo Santillano, Robert Dyer, Ceresa Stewart, Hirna Patel, Nikki Peterson, Alex Herrera, Andy Clifton, Carlos Ramos, Chris Pestka, Chris Holderead, Daniel Daniels, David Dubiel, Freddie Alejandro, John Neff, Jose Bravo, Miguel Reyes, Ralph Lucero, Rene Rodriguez, and Ron Pope. Maricopa County Air Quality Department extends a special thanks to the Maricopa County Flood Control District for hosting and maintaining the interactive air quality web map provided for the public by the County. The Maricopa County Air Quality Department gratefully acknowledges the assistance of other agencies, which provided data and helpful comments to this review. These may include the Arizona Department of Environmental Quality, Pinal County Air Quality Control District, the Maricopa Association of Governments, and the Tribal air monitoring organizations adjacent to Maricopa County. Last, we would like to thank the United States Environmental Protection Agency’s Region 9 personnel for their guidance and support regarding our air monitoring program. Maricopa County Air Quality Department respectfully submits this 2020 Air Monitoring Network Review and 2021 Plan to Region 9 for review. Cover photos: From the left: West 43rd site - new shelter North Phoenix site - new shelter West Phoenix site - small sensor for Phase III U.S. EPA Project Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 3 of 204 Table of Contents ACKNOWLEDGEMENTS .................................................................................................. 3 ABSTRACT .......................................................................................................................... 7 INTRODUCTION TO THE AIR MONITORING NETWORK PLAN ............................ 8 Overview of the Clean Air Act and Criteria Pollutants ......................................................................... 10 The National Ambient Air Quality Standards ......................................................................................... 12 Forecasting and Reporting Air Quality Conditions................................................................................ 13 Information Regarding the Causes, Characteristics, and Compliance of Criteria Pollutants........ 18 AIR MONITORING STRATEGIES AND SURVEILLANCE SYSTEM DESIGN............ 26 Overview of Air Monitoring Requirements and System Design......................................................... 26 Overview of the Air Monitoring Sites ....................................................................................................... 30 2020 SUMMARY OF NETWORK RESULTS AND REQUIRED INFORMATION ......... 33 Determining Data Quality and Acceptability........................................................................................... 33 Summary of 2020 Criteria Pollutant Data ................................................................................................ 35 Summary of 2020 Criteria Pollutant NAAQS Status ............................................................................. 53 2020 O3 Exceedance, Violation, and Exceptional Event Information .............................................. 54 2020 PM10 Exceedance, Violation, and Exceptional Event Information .......................................... 58 2020 PM2.5 Exceedance, Violation, and Exceptional Event Information ......................................... 62 NETWORK MODIFICATION PROCESS .........................................................................63 Summary of 2020 Network Changes and Supporting Documentation ............................................. 63 Proposed Network Modifications and Projects ...................................................................................... 64 Information Regarding Maricopa County’s Supplementary Air Monitoring Programs................. 65 Shared Air Monitoring Responsibilities .................................................................................................... 67 Information Regarding Additional Air Monitoring within Maricopa County.................................. 67 REFERENCES ...................................................................................................................68 APPENDIX I - AIR MONITORING DATA BY SITE .......................................................70 APPENDIX II - EPA-REQUIRED SITE METADATA .....................................................94 APPENDIX III - 2020 DATA CERTIFICATION DOCUMENTATION ........................ 152 APPENDIX IV - EPA CORRESPONDENCE ................................................................. 165 APPENDIX V - ARIZONA INTERAGENCY CORRESPONDENCE............................ 190 APPENDIX VI - PUBLIC NOTICE AND COMMENT INFORMATION ..................... 192 APPENDIX VII - GLOSSARY .......................................................................................... 196 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 4 of 204 List of Tables Table 1. National Ambient Air Quality Standards.......................................................................................... 12 Table 2. Basic SLAMS Air Monitoring Objectives......................................................................................... 27 Table 3. Monitor Types ........................................................................................................................................ 28 Table 4. Site Types ................................................................................................................................................. 29 Table 5. Spatial Scales of Representativeness .................................................................................................. 29 Table 6. 2020 Air Monitoring Site Information .............................................................................................. 31 Table 7. 2020 Criteria Pollutant Data Completeness for SLAMS............................................................... 33 Table 8. Approximate Amount of 2020 Data Produced............................................................................... 34 Table 9. 2020 8-hour CO Average Data Summary ........................................................................................ 36 Table 10. 2020 CO Data Required by EPA ..................................................................................................... 36 Table 11. 2020 NO2 1-hour Data Summary .................................................................................................... 38 Table 12. 2020 NO2 Data Required by EPA ................................................................................................... 38 Table 13. 2020 O3 Eight-hour Average Summary .......................................................................................... 40 Table 14. 2020 O3 Data Required by EPA ....................................................................................................... 41 Table 15. 2020 PM10 24-Hour Data Summary Including EE Data ............................................................ 44 Table 16. 2020 PM10 Data Required by EPA................................................................................................... 45 Table 17. 2020 PM2.5 24-Hour and Annual Averages Including EE Data ................................................ 47 Table 18. PM2.5 3-Year Annual Averages .......................................................................................................... 48 Table 19. PM2.5 3-Year 24-Hour Averages of the 98th Percentile ................................................................ 49 Table 20. 2020 PM2.5 Data Required by EPA .................................................................................................. 50 Table 21. 2020 SO2 Data Summary.................................................................................................................... 52 Table 22. 2020 SO2 Data Required by EPA..................................................................................................... 52 Table 23. 2020 NAAQS Exceedances and Violation Summary .................................................................. 53 Table 24. 2020 PM10 Exceptional Event Information ................................................................................... 58 Table 25. 2020 Violations of the PM10 24-Hour NAAQS Including EE Data........................................ 59 Table 26. 2020 Violations of the PM10 NAAQS Excluding EE Data ....................................................... 61 Table 27. 2020 Open Forum Meeting Attendees ......................................................................................... 195 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 5 of 204 List of Figures Figure 1. 2020 Air Monitoring Site Map ............................................................................................................. 9 Figure 2. MCAQD Clean Air Make More Website ........................................................................................ 13 Figure 3. The Air Quality Index.......................................................................................................................... 14 Figure 4. AirNow Air Quality Maps .................................................................................................................. 15 Figure 5. MCAQD Interactive NowCast Map ................................................................................................ 16 Figure 6. MCAQD Interactive Pollutant Map................................................................................................. 17 Figure 7. 2020 Air Monitoring Instruments by Site ....................................................................................... 32 Figure 8. 2020 CO Monitoring Site Map .......................................................................................................... 35 Figure 9. 2020 NO2 Monitoring Site Map ........................................................................................................ 37 Figure 10. 2020 O3 Monitoring Site Map.......................................................................................................... 39 Figure 11. 2020 PM10 Monitoring Site Map ..................................................................................................... 43 Figure 12. 2020 PM2.5 Monitoring Site Map ..................................................................................................... 46 Figure 13. 2020 SO2 Monitoring Site Map ....................................................................................................... 51 Figure 14. 2020 O3 Exceedance Days................................................................................................................ 55 Figure 15. 2020 O3 2015 NAAQS Violations Including EE Data ............................................................. 56 Figure 16. 2020 Ozone 2015 NAAQS Violations Excluding EE Data ..................................................... 57 Figure 17. 2020 PM10 Exceedance Days ........................................................................................................... 58 Figure 18. 2020 PM10 24-Hour NAAQS Violations - No EE Concurrence ............................................ 60 Figure 19. 2020 PM2.5 Exceedance Days ........................................................................................................... 62 Figure 20. 2020 EPA Data Certification Concurrence ................................................................................ 160 Figure 21. 2020 Non-Criteria Pollutant Data Certification Report .......................................................... 164 Figure 22. EPA Approval for 2019 Air Monitoring Review and 2020 Plan........................................... 179 Figure 23. Near-Road Network Changes Approval Letter......................................................................... 189 Figure 24. 2020 Public Comment Period Announcement.......................................................................... 194 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 6 of 204 ABSTRACT In 2020, the Maricopa County Air Quality Department (MCAQD) Air Monitoring Division (AMD) successfully operated a robust air quality surveillance system that monitored for regulated ambient air pollutants as per 40 CFR Parts 50 and 58. This 2020 Air Monitoring Network Review and 2021 Plan (AMNRP), or “Plan”, documents how the system performed during 2020. The air monitoring data produced are intended for regulatory compliance determinations regarding six regulated ambient air pollutants, known as the “criteria pollutants”. Except where otherwise noted, each monitor meets the requirements of 40 CFR Part 58 - Appendices A, B, C, D, and E, where applicable. The Plan covers changes made to the air monitoring network in 2020, and it provides supporting information for those changes. It also covers changes planned for 2021. MCAQD informs personnel at Environmental Protection Agency Region 9 (EPA R9) office of any significant data collection interruptions immediately. During 2020, some notable accomplishments were: • • • • • • • • • Receiving approval from the EPA R9 to temporarily relocate near-road pollutant monitors at the Diablo site to the Thirty-Third site to remain compliant with federal regulatory monitoring requirements; Removing the shelter and vacating the ADOT property that housed the Diablo near-road monitoring site, which closed in December 2020; Identifying a suitable replacement location for the Diablo site and receiving EPA R9 approval for the location; and securing a property use agreement with ADOT for the new site location and beginning construction; Submitting a request to EPA R9 for discontinuing delta T (temperature inversion) monitoring, and receiving approval to do so because the measurement system could not be easily replaced, and the data were no longer being used by customers; Completing the upgrades begun in 2019 at the West 43rd site by installing a new shelter and power supply; Replacing the ESC-8832 data loggers with the new AgiliareLLC/ESC-8864 data loggers at four sites; Implementing the use of TELEDYNE API T-series gaseous analyzers with the proprietary NumaView™ Software, which provided better data acquisition, logging, and graphing capabilities; and thereby, improved the QC and QA Units’ ability to analyze precision and multi-point verification/calibration data; Partnering with EPA’s Office of Air Quality Planning and Standards (OAQPS) on a threephase low-cost small air sensor research study designed to help determine each model’s data accuracy, plus how well and long each model functions in a hot, arid environment; and Improving the AIRNow and MCAQD’s online air quality maps for the public’s use and benefit. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 7 of 204 INTRODUCTION TO THE AIR MONITORING NETWORK PLAN Each year, MCAQD produces a comprehensive AMNRP, or Plan, that provides vital information regarding the air monitoring surveillance system operating within Maricopa County. The Plan addresses the United States Environmental Protection Agency’s (U.S. EPA) requirements for operating the surveillance system as per 40 CFR Part 58 - Ambient Air Quality Surveillance. As per 40 CFR Part 58, Subpart B §58.10(a)(1), the EPA requires each air monitoring organization (MO) operating within the U.S. and its territories to develop and submit this Plan annually by July 1st following a 30day public comment period. The Plan is complementary to the annual data certification process. It helps us continuously review, assess, and improve how well the County’s air monitoring surveillance system, or “network”, is performing. The design and performance of an ambient air monitoring network and data certification process are covered by the regulatory requirements found in 40 CFR Part 58 - Subpart A (general provisions), Subpart B (monitoring network), Subpart C (special purpose monitors (SPM)), Subpart D (comparability of ambient data to the NAAQS), Subpart F (air quality index (AQI) reporting), and Subpart G (federal monitoring). The Plan addresses other regulatory requirements found in 40 CFR Part 58 Appendix A (quality assurance requirements for state and local air monitoring stations (SLAMS), Appendix C (ambient air quality monitoring methodology), Appendix D (network design criteria for ambient air quality monitoring), and Appendix E (probe and monitoring path siting criteria for ambient air quality monitoring), and Appendix G (AQI and daily reporting). The Plan’s information includes, but is not limited to: • The purpose for monitoring and the type of monitoring conducted at each site; • Detailed descriptions and metadata about each monitoring site; • Metadata for each pollutant monitor that operated in 2020; • Three years of criteria pollutant (CP) data from each monitor; • Design value metrics that identify the monitoring site with the highest O3 and PM2.5 concentrations measured over the past 3 years; • The minimum quantity of monitors required for each CP network; • Summaries of pollutant data by network and required statistical analyses; • The quality and suitability of pollutant data for comparison to the NAAQS; • The compliance status of MCAQD monitors with the six CP NAAQS, including exceedance days and violations; • Proposed changes to the pollutant networks, sites, monitoring and analytical laboratory methods within the next 18 months; • Brief information regarding special purpose and/or research-driven air monitors, if operated; • The reporting of real-time pollutant and meteorological data to the public via our web map and AIRNow; • Any requests for waivers from specific air monitoring requirements; • Interagency correspondence regarding the air monitoring program; and • Public comments received regarding the final draft AMNRP and MCAQD’s response to the comments. Regarding public comments, each year MCAQD solicits comments from the public on the final draft AMNRP during a 30-day public comment period. We also hold an open forum meeting, which is Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 8 of 204 open to the public. As needed, MCAQD amends the final draft based on the comments received and submits the Final AMNRP to EPA R9 for review and approval. EPA R9 completes the review process within 120 days of receiving the Plan, and EPA R9 Administrator, or their representative, must approve the requests for network changes and waivers. If EPA does not approve the Plan, then MCAQD addresses the concerns presented by EPA R9 personnel and submits a revised Plan. Following EPA’s approval of the Plan, MCAQD posts it on our website. In 2020, MCAQD’s monitoring network was comprised of 22 monitoring sites. Figure 1 shows the location of MCAQD’s air monitoring sites discussed in this year’s Plan. Figure 1. 2020 Air Monitoring Site Map Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 9 of 204 Overview of the Clean Air Act and Criteria Pollutants Between the years 1900 and 1970, the emission of the six CPs increased significantly. These pollutants occur throughout the U.S., and are known to cause health problems, property damage, and harm to the environment. The first federal legislation involving air pollution control was the Air Pollution Control Act of 1955, which provided funds for federal air pollution research. Later, the Clean Air Act (CAA) of 1963 was passed, which was the first federal legislation to actually control air pollution. It authorized research into techniques for air monitoring and controlling air pollution. This led to the Air Quality Act of 1967 being passed, which expanded federal studies of air pollutant emission inventories, ambient air monitoring techniques, pollution control techniques, and initiated review of air pollution transport. The enactment of the 1970 CAA produced a major shift in the federal government’s role in air pollution. It authorized the development of comprehensive federal and state regulations to limit pollutant emissions from stationary and mobile sources. It also set forth four major regulatory programs affecting stationary pollution sources: • NAAQS, • State Implementation Plans (SIP), • New Source Performance Standards (NSPS), and • National Emission Standards for Hazardous Air Pollutants (NESHAPs). The 1977 CAA Amendments (CAAA) furthered air monitoring efforts related to the “Prevention of Significant Deterioration” (PSD). In short, PSD air monitoring data are used for permitting a new source wishing to start-up in an attainment area. Then, the 1990 CAAA increased the authority and responsibility of the federal government, and it established new regulatory programs for acid rain deposition, stationary source permitting, and expanding the NESHAPs program to control toxic air pollutants. It also included provisions for protecting stratospheric O3 and expanding air quality research programs. The CAA, and its amendments, provide the framework for pertinent State/Local/Tribal (S/L/T) agencies to assess and protect air quality through an air monitoring program. Unless generated for research, special studies, or unless otherwise noted, each monitor meets the requirements of 40 CFR Part 58 – Subpart G - Appendices A, B, C, D, and E, where applicable. This means that the data MCAQD produces are of acceptable quality for NAAQS comparisons and compliance determinations, which is the primary purpose for generating the data. Please note that Appendix B applies to PSD monitoring only and that no PSD monitoring was conducted within Maricopa County. MCAQD monitors for five CPs, which are: 1. Carbon monoxide (CO) 2. Nitrogen oxides (NOx) with nitrogen dioxide (NO2) used as the indicator compound 3. Ozone (O3) 4. Particulate matter ≤10 micrometers (PM10) and ≤2.5 micrometers (PM2.5) 5. Sulfur dioxide (SO2) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 10 of 204 The U.S. EPA regulates CPs using the NAAQS, which establish ambient levels for each CP using health and welfare-based criteria. There are two sets of NAAQS standards. As per CAA §109(b), the “primary” NAAQS are designed to provide an adequate margin of safety that is requisite to protecting public health. The “secondary” NAAQS are designed to protect public welfare from any known or anticipated adverse effects associated with the presence of a CP in the ambient air. The primary standards protect public health and secondary standards protect public welfare by preventing damage to property such as farm crops and buildings, visibility impairment in national parks and wilderness areas, and the protection of ecosystems. The NAAQS are not static. The CAA requires that they undergo periodic review using the most recent medical, epidemiological, physiological, and ecosystem research available. Historically, when a NAAQS level changes; the new level(s) is lower. Lowering a NAAQS level occurs when medical, epidemiological and other scientific research such as ecosystem and visibility effects demonstrate that NAAQS are not adequately protecting public health and welfare. Detailed information regarding the NAAQS development can be found in this section under each pollutant’s overview. The NAAQS review is a lengthy process that assesses the science upon which each NAAQS is based as well as the standard itself. The Clean Air Scientific Advisory Committee (CASAC) provides independent advice to the U.S. EPA concerning the need to change a standard. In addition, comments are solicited from the public. More information regarding the NAAQS review process is available at EPA’s website. U.S. EPA’s Regional Offices oversee the enforcement of the CAA, and MCAQD falls under the jurisdiction of EPA R9. U.S. EPA OAQPS oversees the air monitoring program at a national level, leads regulatory and/or policy changes affecting air monitoring operations and quality requirements, and engages in the review of the NAAQS. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 11 of 204 The National Ambient Air Quality Standards NAAQS are geared toward improving air quality in geographical areas where the current quality is unacceptable as well as preventing air quality deterioration in geographical areas where the air is relatively free of pollution. Since each CP has different health effects and environmental damage potential, NAAQS level(s) are different for each pollutant. Some pollutants have standards for both long-term and short-term averaging times. The short-term standards are designed to protect against acute health effects, while the long-term standards are designed to protect against chronic health effects. Table 1 shows a summary of the current primary and secondary NAAQS levels for each CP. Pollutant Carbon Monoxide (CO) Lead (Pb) Nitrogen Dioxide (NO2) Ozone (O3) Particle Matter (PM) PM2.5 PM10 Sulfur Dioxide (SO2) Table 1. National Ambient Air Quality Standards Standard Averaging Level Form Type Time 8 hours 9 ppm Not to be exceeded more than primary once per year 1 hour 35 ppm primary and Rolling 30.15 μg/m3 secondary month average Not to be exceeded primary 1 hour 100 ppb 98th percentile of 1-hour daily maximum concentrations, averaged over 3 years primary and secondary 1 year 53 ppb Annual Mean primary and secondary 8 hours Annual fourth-highest daily 0.070 ppm maximum 8-hour concentration, averaged over 3 years primary 1 year 12.0 μg/m3 Annual mean, averaged over 3 years secondary 1 year 15.0 μg/m3 Annual mean, averaged over 3 years primary and secondary 24 hours 35 μg/m3 98th percentile, averaged over 3 years primary and secondary 24 hours 150 μg/m primary 1 hour 75 ppb 3 Not to be exceeded more than once per year on average over 3 years 99th percentile of 1-hour daily maximum concentrations, averaged over 3 years Not to be exceeded more than once per year Source: Adapted from the table shown: https://www.epa.gov/criteria-air-pollutants/naaqs-table secondary Final – 2020 Air Monitoring Network and 2021 Plan 3 hours 0.5 ppm June 23, 2021 Page 12 of 204 Forecasting and Reporting Air Quality Conditions This section provides information regarding the use and reporting of continuous, real-time data at the County and national level. It also provides historical information on how the reporting of air quality conditions has improved over the years. Air Quality Forecasting Forecasting air quality depends upon having air quality data available that can be put into a model. The model generates information needed for meteorologists to make forecasts. For a decade or so, continuous analyzers and meteorological instruments have measured and reported hourly data to their monitoring organization (MO) for distribution and/or to AirNow. The readily available data are invaluable to air quality forecasters, because they can better predict what the air quality index (AQI) will be tomorrow. ADEQ and MCAQD developed a year-round air quality forecasting and “restriction” reporting process for the Phoenix metropolitan area. In Maricopa County, ADEQ is lead for air quality forecasting and issuing a “High Pollution Advisory” (HPA) or a “Health Watch” (HW), while MCAQD designates a “No Burn Day”. MCAQD’s CLEAN AIR MAKE MORE website provides a description of each of these restrictions; plus, loads of helpful information on improving air quality. Figure 2 shows an overview of the content available. Figure 2. MCAQD Clean Air Make More Website Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 13 of 204 The EPA Air Quality Index and NowCast Since the 1950s, as per 40 CFR Part 58, Appendix G, the Uniform Air Quality Index (AQI) and Daily Reporting, the EPA has required that MOs report air quality conditions to the public regarding CP health risks based upon data from their network. EPA requires that a MO within a metropolitan statistical area with a population greater than 350,000 report the AQI; otherwise, it is voluntary. To do so, EPA developed the AQI, which is a health risk communication tool that converts CP concentrations into six health-impact related color-coded indices based upon the NAAQS. Members of the public used the AQI forecast to reduce their exposure to air pollution and its associated health effects by modifying their daily activities. The AQI graduated color scheme is shown on Figure 3. Figure 3. The Air Quality Index Source: 40 CFR Part 58, Appendix G – Uniform Air Quality Index and Daily Reporting Air Quality Index (AQI) Basics In the early 2000s, AirNow began using “NowCast” values that tried to reflect current conditions. However, values were based upon each pollutant’s NAAQS averaging time, and it was recognized that these formulas do not respond well to real-time, rapidly changing air quality conditions. For instance, in the desert areas of the Southwest during the Monsoon Season, dust storms often emerge and dissipate within several hours. These events can drive PM10, and sometimes PM2.5, concentrations well into the unhealthy range. Since the NAAQS averaging time for PM10 is 24 hours, a dust storm the evening before can cause air quality conditions to show in the orange range or higher the following day even though the sky is clear; and, no impact for the prior day’s event is affecting present conditions. Smoke from a brief fire can adversely affect air quality for PM2.5 likewise. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 14 of 204 The abundance of continuous data in the last decade has furthered our understanding of pollutants, especially PM2.5. This information helped improve the NowCast formulas so values better reflect rapidly changing conditions. To develop the new formulas, EPA analyzed millions of data points gathered from all parts of the U.S. Since PM10, PM2.5, and O3 make up most air pollution concerns throughout the U.S., the updated NowCast reports on health risks related to these pollutants, only. The formulas use a shorter averaging time when a pollutant’s concentration is high and a longer averaging time when a pollutant’s concentration is low and conditions are stable. Also, U.S. EPA provides an online NowCast calculator. AirNow Web Maps In 2015, EPA began transitioning to the new formulas on the AirNow website. Figure 4 shows the newly updated AIRNow website that includes multiple maps, which communicate air quality throughout the country. The Current default map shown below provides the NowCast for O3 and PM pollutants. Again, the different AQI colors on the map indicate health risks using pollutant concentrations. Below, the combination of O3, PM10, and PM2.5 is showing moderate health risks in the yellow areas and an increased risk for unhealthy or sensitive groups within the orange area. The MCAQD has participated in the AirNow program since 2001. The MCAQD distributes 1-hour continuous CP and select meteorological data to the AirNow website. The AirNow maps cover a geographical area as far east as Queen Creek, as far south as Casa Grande, and as far west as the town of Palo Verde. Air quality data from ADEQ, Local, Tribal, and National Park Service air monitoring operations within Arizona populate the map as well. Source: EPA AirNow Figure 4. AirNow Air Quality Maps Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 15 of 204 The Maricopa County Interactive Air Quality Map The MCAQD also provides real-time data on our website using an interactive air quality map with three layers of information. Figure 5 shows the default Current Conditions map, which uses the latest NowCast formula to provide a site’s Maximum NowCast value for either PM10, PM2.5 or O3 , as well as the latest formulas for each of the three pollutants’ NowCast values. The second tab shows the AQI developed by an unofficial, rolling formula. The third tab shows the Raw Data map, which provides hourly CO, NO2, O3, PM2.5, SO 2, and 5-minute concentrations for PM10 and meteorological data from each site. Figure 5. MCAQD Interactive NowCast Map Source: MCAQD’s Air Quality Website Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 16 of 204 Figure 6 shows the Raw Data map for O3 concentrations. If a site does not have an O3 monitor, a gray cross “+” appears, indicating that no O3 monitor is operating at a site or it has not reported data for several hours. A gray cross on the PM10 and PM2.5 layers has the same meaning. Figure 6. MCAQD Interactive Pollutant Map Source: MCAQD Air Quality Website Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 17 of 204 Information Regarding the Causes, Characteristics, and Compliance of Criteria Pollutants Unless otherwise noted, the information regarding air pollutants in this section was compiled from various pages at the U.S. EPA’s Air and Radiation website. Carbon Monoxide (CO) Carbon monoxide is a colorless, odorless gas found in both outdoor and indoor air. Carbon monoxide is primarily formed by the incomplete combustion of fossil fuels, e.g., carbon-containing fuels, and the photochemical reactions of gases in the atmosphere. Concentrations of CO tend to peak in the colder, winter months. Carbon monoxide is produced by both natural and anthropogenic sources, aka, human activities. One of the more significant anthropogenic sources of CO is automobile exhaust. Concentrations of CO from motorized vehicles lowered considerably over the last three with cleaner fuels and substantial changes to automobile engines and exhaust emissions controls, all of which results in a more efficient use and combustion of fuel. Natural, or biogenic, sources of CO emissions include volcanic emissions and smoke from wildfires. Smoke from tobacco, cooking, fireplaces, and woodstoves contribute to indoor exposure to CO. In Arizona, the primary sources of CO are exhaust from motor vehicles, electricity generation, industrial and commercial boilers, and household natural gas burning. Carbon monoxide can be a minor contributor to the formation of ground-level O3. Carbon monoxide enters the body through inhalation, and the body eliminates CO primarily through exhalation and to a lesser extent through metabolic activity. After being inhaled, CO enters the bloodstream and binds to the blood’s hemoglobin; thereby forming carboxy-hemoglobin that displaces oxygen (O2) in the blood. This reduces the blood’s capacity to carry O 2 to organs and tissues and causes the body to become O2 deprived. This deprivation of O2 is called hypoxia. This can adversely affect those with anemia, because anemia already reduces the blood’s ability to carry O2. Exposure to CO can result in a type of cardiovascular disease called ischemic heart disease, especially for those with existing heart problems. The central nervous system is adversely affected by CO as well. Acute exposure to severely high levels of CO is toxic and potentially fatal, and its effects on the body are well-known and widely studied. According to the Agency for Toxic Substances and Disease Registry, severe acute poisoning can cause cardiac arrest, heart attack, seizers, hypotension, respiratory arrest, noncardiogenic pulmonary edema, and coma. Moderate exposure may include many symptoms, such as confusion, chest pain, and weakness. Mild exposure may lead to symptoms that include headache, nausea, vomiting, dizziness, and blurred vision. In 1971 U.S. EPA established identical primary and secondary standards for CO: an 8-hour primary standard at 9 parts per million (ppm) and 1-hour primary standard at 35 ppm. EPA has reviewed the CO NAAQS several times since 1971, which led to the secondary standard being revoked in 1985. The primary standard levels have not changed to date, and currently, CO concentrations nationwide are substantially lower than the CO NAAQS. No exceedances or violations of the CO NAAQS occurred at any site in 2020. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 18 of 204 Lead (Pb) Lead is a heavy metal that occurs naturally in the environment and it is used in manufactured products. The major sources of Pb emissions have historically been motor vehicles and industrial sources. In the early 1970s, EPA established national regulations to reduce the Pb content in gasoline, gradually. In 1975, unleaded gasoline was introduced for motor vehicles equipped with catalytic converters. The EPA banned the use of leaded gasoline in “highway motor vehicles” in December 1995. A highway vehicle includes, but is not necessarily limited to, passenger vehicles propelled by their own motor, whether such motor is powered by gasoline, diesel fuel, special motor fuels, electricity, or otherwise. Due to the phase-out of leaded gasoline, metals processing is the major source of lead emissions to the air today. The highest levels of Pb in air are generally found near lead smelters. General aviation airports are also a significant source of Pb, as general aviation fuel still contains Pb additives. Other stationary sources include waste incinerators, utilities, and Pb-acid battery manufacturers. Exposure to Pb has an array of adverse health effects. Once taken into the body, Pb distributes throughout the body in the blood and accumulates in the bones. Depending on the level of exposure, Pb can adversely affect the nervous system, kidney function, immune system, reproductive and developmental systems, and the cardiovascular system. Lead exposure also affects the O2 carrying capacity of the blood. Currently, the foremost health effects associated with Pb exposure to children are neurological and for adults cardiovascular, e.g., high blood pressure and heart disease. Infants and young children are especially sensitive to even low levels of Pb, which may contribute to behavioral problems, learning deficits, and lowered IQ. Lead is persistent in the environment and accumulates in soils and sediments through deposition from air sources, direct discharge of waste streams to water bodies, mining, and erosion. Ecosystems near Pb point-sources demonstrate a wide range of adverse effects including losses in biodiversity, changes in community composition, decreased growth and reproductive rates in plants and animals, and neurological effects in vertebrates. Following the removal of Pb in gasoline, Pb emissions decreased by 94 percent between 1980 and 1999. Air monitoring showed that Pb concentrations in Maricopa County were well below the NAAQS; thus, air monitoring discontinued in 1997. In 2008, the Pb primary standard was revised to better protect public health, especially for “sensitive” populations, which include asthmatics, children, and the elderly. The lowered NAAQS Level required Pb monitoring near sources that emitted more than one ton of Pb per year. The MCADQ conducted source-oriented Pb monitoring at Deer Valley Airport for more than ten years. The results showed that the ambient levels of Pb at Deer Valley Airport are well below the Pb NAAQS. In addition, Pb emissions from the airport have decreased since monitoring began. In lieu of this information, EPA R9 approved MCAQD discontinuing Pb monitoring at the airport. The last Pb air sample was collected on December 29, 2019. The revised Pb NAAQS requires Pb monitoring at NCore stations around the U.S.; and ADEQ continues to monitor for ambient Pb at the local NCore station at JLG Supersite (04-013-9997) in Phoenix. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 19 of 204 Nitrogen Oxides (NOX) with Nitrogen Dioxide (NO2) as the Indicator Compound Nitrogen dioxide belongs to a family of reactive gases called NOx. These gases are formed when fuel is burned at high temperatures, and they are primarily emitted from motor vehicle exhaust and power plants. Nitrogen oxides are key compounds in the production of ground-level ozone (O3). Nitrogen dioxide has been selected by EPA as the “indicator” compound for NOx. Unlike the other gaseous CPs, we measure the ambient levels of NOx indirectly. The analytical process involves determining the concentration of NO2, then nitric oxide (NO). NO2 and NO concentrations are summed to determine the NO X concentration. For most of the population, the primary route of NO2 entry into the body is inhalation. Current scientific evidence links short-term NO 2 exposures, ranging from 30 minutes to 24 hours, with adverse respiratory effects including airway inflammation in healthy people and increased respiratory symptoms in people with asthma. Studies show a connection between breathing elevated short-term NOx concentrations and increased visits to emergency rooms and hospital admissions for respiratory issues, especially asthma. Additionally, NO2 reacts with ammonia, moisture, and other compounds to form small nitrate particles. These small particles penetrate deeply into sensitive parts of the lungs and can cause or worsen respiratory disease, such as emphysema and bronchitis. They can aggravate existing heart disease, leading to increased hospital admissions and premature death, too. In 1971, EPA established the first primary and secondary standards for NO 2 at 53 ppb, averaged annually. EPA reviewed the standards in 1985 and 1996 and chose not to revise either standard. In January 2010, EPA retained the 1971 standards and added a 1-hour average limit of 100 ppb to the primary standard, determined as a three-year average of the annual 98th percentile value. Research indicates that individuals who spend time on or near major roadways can experience acute exposures to NO2 concentrations that are considerably higher than those measured by the NO2 network. “Near-roadway” means within about 50 meters of a major roadway. Research by the EPA shows that NO 2 concentrations inside vehicles can be 2-3 times higher than those measured at nearby area-wide monitors; and, MCAQD has found NO2 concentrations to be approximately 30 to 100% higher than ambient concentrations away from roadways. For this reason, in February 2010 the EPA revised the 1-hour NO2 NAAQS and promulgated requirements for monitoring NO2 near roadways in large urban areas. In response, AMD established two NO2 monitor sites: Diablo, which was located near I-10 and U.S. Hwy 60 - east of downtown Phoenix, and Thirty-Third, which is located off I-10 and 33rd Avenue - west of downtown Phoenix. In 2020, Thirty-Third was the only near-road site operating due to Diablo site closing for I-10 improvements. The AMD worked with ADOT to identify and secure a location in the same general area as the Diablo site based upon population and traffic counts. The location near I-10 and 36th Street was approved by EPA R9 in June 2020. Site build-out began following approval, was completed in early 2021, and is currently operational. In 2020, there were no exceedances of the 1-hour or annual NO2 NAAQS. Maricopa County is currently in attainment for the NO2 1971 and 2010 NAAQS. In fact, no area within the U.S. is in nonattainment with the NO2 NAAQS. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 20 of 204 Ozone (O3) Ozone is a colorless, slightly odorous, reactive gas molecule containing three oxygen atoms. Ozone occurs naturally in the Earth’s upper atmosphere, or the stratosphere, where it has a beneficial effect of protecting us from the Sun’s harmful ultraviolet rays. However, at ground-level, it is the main component of smog, and adversely affects public heath, vegetation and ecosystems, and can cause damage to man-made materials. Ozone is not directly emitted into the air but is formed by a complex photochemical reaction that involves sunlight, primarily ultra-violet light, or (UV), heat, and a “soup” of pollutants, especially volatile organic compounds (VOC) and NOx. Ozone is continually going through a rapid, natural cycle of being formed, then converted back to the more stable, “diatomic” oxygen molecule (O2). Anthropogenic activities have been a leading cause of ground-level O3 due to VOC and NOx emissions from industrial facilities, electric utilities, motor vehicles, and chemical solvent vapors. Ozone is likely to reach unhealthy levels on hot, sunny days in urban environments, but it can affect rural areas by being transported long distances by wind. Although the Phoenix metropolitan area has sunshine most of the year, shorter days and weak UV during the late fall and winter months keeps O3 from reaching unhealthful concentrations. Ozone causes significant physiological and pathological changes in both animals and humans at concentrations present in many urban environments. Ozone affects the respiratory system in people and animals, and it affects the growth of plants. The primary route of entry into the body is inhalation, and symptoms of O3 exposure generally involve the lungs. Symptoms can include coughing, a sore or scratchy throat, shortness of breath, chest pain on deep inhalations, increases in asthma attacks, and damage to the lungs. Children are the population at greatest risk due to several factors: their lungs are still developing; they are more likely to be active outdoors when O 3 levels are high; and they are more likely to have asthma than adults are. It has been widely documented that O3 even at low concentrations causes damage to plants and reduces crop yields, resulting in it being considered by plant scientists as the most important phytotoxic air pollutant. The first NAAQS regulating O3 levels was implemented in 1971. The 1971 NAAQS included a primary and secondary 1-hour level of 0.08 ppm (80 ppb) for “total photochemical oxidants” (TPO). This level could not be exceeded more than 1-hour per year. TPOs are “precursors” to O3 development and were used as the “indicator compound(s)” to ascertain O3 concentrations. These compounds are used widely in industry and include reactive VOCs. After scientific review, U.S. EPA revised the NAAQS in 1979, establishing O3 as the indicator compound, or chemical. Both primary and secondary NAAQS changed to an annual 1-hour level of 0.12 ppm (120 ppb) for O3 only. From 1979 to date, the O3 NAAQS levels have been established using O3 concentrations only. In 1997, EPA revised both O3 NAAQS by establishing an 8-hour level of 0.08 ppm (80 ppb). The 1997 NAAQS introduced a new averaging time for determining compliance. Compliance with the revised NAAQS was determined when the 4th highest daily O3 maximum 8-hour average over a 3-year period was less than or equal to 0.08 ppm (80 ppb). Note that the 8-hour average rounded to the nearest hundredth of a ppm, meaning an 8-hour average concentration had to be greater than or equal to 0.085 ppm for an exceedance of the 1997 NAAQS to occur. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 21 of 204 In March 2008, the EPA, again, further reduced the primary and secondary 8-hour O3 NAAQS from 0.080 to 0.075 ppm (75 ppb). Compliance with the NAAQS is determined by averaging the 4th highest 8-hour average over a 3-year period, which must be less than or equal to 0.075 ppm. In December 2015, the EPA lowered both the primary and secondary 8-hour O3 NAAQS levels to 0.070 ppm (70 ppb). Compliance with the NAAQS is determined by averaging the 4th highest 8-hour average over a 3-year period, which must be less than or equal to 0.070 ppm. Regarding Maricopa County’s status with the NAAQS, we have attained the 1979 1-hour standard. The EPA revoked the 1979 1-hour NAAQS for the Phoenix-Mesa nonattainment area in 2005. In addition, the Phoenix-Mesa nonattainment area for the 1997 8-hour O3 NAAQS is now in attainment. When the 2008 NAAQS became effective in May 2008, O3 concentrations in the County had improved, but exceeded the new level. This led to EPA designating portions of Maricopa and Pinal Counties as nonattainment for the 2008 O3 NAAQS in 2012. Otherwise, the EPA has redesignated the state of Arizona as in attainment for the 2008 O3 NAAQS effective October 17, 2014. In 2020, there were 34 days when at least one O3 monitor exceeded the 2015 8-hour NAAQS, and fifteen monitors violated the standard. If EPA R9 concurs with EE submittals for 2018 – 2020, then eight sites will violate. Information regarding EEs, and their effects on O3 exceedance days and NAAQS violation statuses, see the 2020 O3 Exceedance, Violation, and Exceptional Event Information Summary of 2020 Criteria Pollutant NAAQS Status section. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 22 of 204 Particulate Matter (PM) Particulate matter is a collective term describing very small solid or liquid particles that vary considerably in size, geometry, chemical composition, and physical properties. Numerous chemical components may be present in particle pollution including acids, nitrates, sulfates, organic chemicals, metals, soils, and finer dust particles. Particulates can be formed by natural processes, such as pollen production and wind erosion, and anthropogenic activities, such as commercial/industrial/agricultural operations and motor vehicle use. Particulates contribute to visibility reduction, pose a threat to public health, and cause economic damage. The EPA currently regulates PM pollution using two size categories: • “PM10”, particles with size range ≤10 micrometers (µm) in aerodynamic diameter; and • “PM2.5”, aka “fine particles”, particles with a size range of ≤2.5 µm in aerodynamic diameter. The larger particles that make up PM10 form through mechanical processes such as the grinding of matter and the atomization of liquids, natural weathering processes, and anthropogenic activities that disturb soil. In Arizona, elevated concentrations of PM10 are associated with people driving on unpaved roads, dusty industries, and dust storms related to high wind events. Fine particulates are formed by the incomplete combustion of fossil fuels, the condensation of vapors, and photochemical processes. Fine particulates are further classified as “primary”, meaning they are produced within and emitted directly from a source such as exhaust from a diesel engine or smoke from a fire. “Secondary” particulates form in the atmosphere from gaseous pollutants. Nitrates and sulfates are formed by the photochemical oxidation of gaseous NO2 and SO2, respectively. In addition, secondary organic carbon particles form through a photochemical transformation of gaseous organic compounds. The primary route of entry for PM10 into the body is through inhalation. The size, shape, and chemical composition of particulates determine the health effects that may result from PM exposures. The potential for causing health problems is directly linked to particle size. Smaller particles are more toxic than larger particles because of the higher relative content of toxic metals and ions combined with the increase of particle surface area. The EPA is concerned about particles ≤10 µm in diameter, because those are the particles that generally pass through the throat and nose and enter the lungs. Coarser particles are deposited in the upper parts of the respiratory system, but finer particles are deposited deeper into the respiratory system. Fine particles are small enough to be deposited in the lung’s alveoli, which are tiny air sacks deep inside the lungs. Some research shows that the smallest of particles may enter the bloodstream as well. Currently, research is underway to better understand the health effects of ultrafine particles. The populations most at risk from particulate exposure are older adults, diabetics, and children; because children tend to be more physically active and that causes them to breath faster and deeper. Once inhaled, these particles can cause serious heart and lung health effects that affect both humans and animals. Epidemiological studies show that long-term, chronic exposures, i.e., years of exposure to high levels of particulates, are associated with reduced lung function, the development of chronic bronchitis, and premature death. Studies show that short-term, acute exposures, i.e., hours to days of exposure to high levels of particulates, can aggravate lung disease, asthma attacks, acute bronchitis, Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 23 of 204 and may increase susceptibility of respiratory infections. For those with heart disease, it can induce heart attacks. Exposure to acidic aerosols, i.e., acidic particles with an aerometric diameter of about 0.01 – 100 µm, have been linked to the upper respiratory tract and pulmonary system’s inability to remove harmful particles. In 1987, U.S. EPA replaced the 1971 Total Suspended Particulates (TSP), i.e., particles around 40 µm and less in aerometric diameter, with the primary and secondary NAAQS for PM10. The EPA revoked the annual PM10 NAAQS in 2006. Currently, the 24-hour primary and secondary levels for PM10 are both 150 µg/m3 as per the 1987 NAAQS. In 2012, the PM10 NAAQS underwent review with exposure to PM10-2.5 also being considered. This review resulted in EPA retaining the existing primary and secondary 24-hour PM10 NAAQS, which is considered to provide for protection against effects associated with acute exposure to PM10-2.5 . In 1997, the U.S. EPA implemented a primary and secondary NAAQS for PM2.5 with an annual level of 15 µg/m3 and a 24-hour level of 65 µg/m3. In 2006, the annual NAAQS levels were not changed, but the 24-hour NAAQS level was lowered to 35.0 µg/m3. In 2012, the primary annual NAAQS was lowered to 12.0 µg/m3, but the secondary annual NAAQS and the 24-hour NAAQS levels were not changed. While Maricopa County is currently in attainment for PM2.5, we tend to experience 24-hour exceedances during the colder, winter months, especially from Thanksgiving into January. In colder months, smoke from residential fireplaces coupled with the temperature inversions tends to drive up PM2.5 concentrations throughout the metropolitan area. To address this problem, ADEQ and Maricopa County worked together on a public outreach campaign to reduce wood burning within the County around the fall/winter holidays. Maricopa County’s umbrella dust abatement rule, Rule 310 – Fugitive Dust From Dust-Generating Operations, has been revised many times through the years. Rule 310 regulates construction dust, trackout dust, and dust from unpaved parking and vacant lots. The recent PM10 SIP includes seventy-seven new measures to enhance enforcement of the rule, implementation of agricultural best management practices, diesel engine replacement and retirement programs, and requirements for cleaner burning fireplaces to further reduce PM2.5 emissions. The western U.S. has a unique problem with exceeding the PM NAAQS. It has been acknowledged for decades that exceedances of the PM NAAQS due to blowing dust and smoke from massive wildfires may be “exceptional” in nature, i.e., not expected to recur or caused by acts of nature that overwhelm emission controls. Initially by policy, and later by rule, EPA established procedures and standards for documenting whether an exceedance of the NAAQS is the result of an “exceptional event” (EE) and if the pollutant data should be excluded from NAAQS compliance determinations. In 2007, EPA adopted the Treatment of Data Influenced by Exceptional Events (EER) rule that covers how to prepare an EE package for EPA’s review and how to manage event-related data. In the past few years, most exceedances of the PM10 NAAQS within Maricopa County have been successfully shown to meet the EE requirements. Information regarding EEs, and their effects on exceedance days and NAAQS violation statuses, is provided in the Summary of 2020 Criteria Pollutant NAAQS Status section. In 2020, there were four unique days when at least one PM10 monitor exceeded the 1987 24-hour PM10 NAAQS level, but no monitors will violate the PM10 NAAQS if EPA R9 concurs with EE submittals. For PM2.5, there were eleven unique days when at least one monitor exceeded the 2012 24-hour NAAQS level, but no monitors violated the PM2.5 NAAQS. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 24 of 204 Sulfur Dioxide (SO2) Sulfur dioxide is a colorless gas with a pungent irritating odor at elevated concentrations. It is emitted primarily from the burning of high-sulfur coal, oil, and diesel fuel, and the smelting of metals like copper. Most fuels contain trace quantities of sulfur. When fuels burn, both gaseous SO2 and sulfate particles are released into the air. Consequently, separating the health effects of these two chemicals is difficult. Together, SO2 and PM2.5 act separately and together to threaten public health and can make up a major portion of pollution in many cities. Sulfur dioxide is removed from the atmosphere through dry deposition, and it is converted to sulfuric acid, and eventually sulfate particles. Both contribute to public health problems and negatively affect the environment. The SO2 and sulfate from vehicular emissions have been significantly reduced over the years through lowering the sulfur content in diesel fuel and gasoline. Sulfur dioxide’s primary route of entry into the body is by inhalation. It contributes to respiratory illness, particularly in children and the elderly, and aggravates existing heart and lung diseases. Sulfur dioxide contributes to the formation of acid rain, and it contributes to the formation of atmospheric particles that cause visibility impairment, most notably in national parks. Sulfur dioxide and the pollutants formed from SO2, such as sulfate particles, can be transported over long distances and deposited far from the point of origin. This means that problems associated with SO2 are not confined to areas where it is emitted. In Maricopa County, mobile and industrial sources emit the majority of SO2. The majority of statewide SO2 emissions occurs in eastern Arizona and is produced by coal-based electricity generation, the smelting of non-ferrous sulfide copper ore, and smoke from wildfires. Major controls were installed in Arizona’s copper smelters in the 1980s, which reduced SO2 emissions substantially. In addition, most of the copper ore smelters that previously operated have been shutdown, which reduced SO2 emissions in localized areas around the state. In addition, all of the coal-fired power plants in the State have installed scrubbers, which remove over 90% of the SO2 emissions. The U.S. EPA first established primary and secondary NAAQS for SO2 in 1971. The NAAQS levels changed in 1973 and 2010. In 2010, EPA revised the primary SO2 NAAQS by revoking an annual level of 0.03 ppm (3 ppb) and the 24-hour level of 0.14 ppm (14 ppb). In February 2019, EPA retained the 2010 NAAQS levels following CASAC’s most recent review. Currently, the primary SO2 NAAQS is a 1-hour level of 75 ppb, and the secondary NAAQS is 0.5 ppm (500 ppb). Compliance with the primary NAAQS is determined by averaging the 99th percentile of 1-hour daily maximum concentration average over a 3-year period, which cannot be greater than 75 ppb. For compliance with the secondary NAAQS, a 3-hour average cannot exceed a concentration of 0.5 ppm more than once per year. In 2020, there were no exceedances or violations of the primary or secondary SO 2 NAAQS. Currently, Maricopa County is in attainment for SO2. The AMD operates two year-round SO2 monitoring stations, and the siting of SO2 monitors meets EPA requirements. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 25 of 204 AIR MONITORING STRATEGIES AND SURVEILLANCE SYSTEM DESIGN Overview of Air Monitoring Requirements and System Design In 2020, the AMD monitored for five CPs by operating and maintaining 22 ambient air monitoring sites located throughout Maricopa County. The sites’ start-up dates range from 1961 for Central Phoenix to 2021 for new Eastwood site. Land use patterns around the sites vary from densely populated urban areas to sparsely populated rural settings. The sites’ elevations range from 845 feet above sea level at Buckeye to 5190 feet above sea level at the top of Humboldt Mountain. Some sites measure many pollutants, while others may only measure one or two. The MCAQD chose each site and its pollutant monitors based on specific EPA requirements as described below, special requests from EPA, and/or specific needs of the County. The 40 CFR Parts 50 and 58 provides the requirements for operating an ambient air monitoring program. The MCAQD is fully responsible for designing and operating the total air monitoring surveillance system and managing the pollutant data generated. The MCAQD holds the Primary Quality Assurance Organization (PQAO) designation for the County’s ambient air monitoring network, which basically means that we do not share QA roles and/or responsibilities with another MO. The MCAQD operates air monitors at EPA-approved State and Local Air Monitoring Stations (SLAMS), which includes the near-road stations. On occasion, special air monitoring initiatives involve temporarily operating CP monitors designated as Special Purpose Monitors (SPM), as well as PM speciation and air toxics monitors. This section details how each CP network is designed to obtain “representative” data. The 40 CFR Part 58 Appendix D covers the requirements for designing the air monitoring network and is summarized in this section. To determine compliance with the NAAQS, EPA-approved air monitors must collect the CP data. The EPA classifies approved monitor methods into one of three categories: a federal reference method (FRM), a federal equivalent method (FEM), or an approved regional method (ARM). The MCAQD uses FRM and FEM instruments. This practice ensures high-quality data of like kind are used for compliance-driven decisions. However, data from research monitors, e.g., non-compliance monitors, can be used to develop state and/or federal attainment and maintenance plans, further evaluate regional air quality models used in developing emissions control strategies, tracking trends in air pollution, and evaluating the impact control measures are having on improving air quality. Any short-term research data collected by the MCAQD can be made available to decision makers; but the data are not reported to AQS. Within Maricopa County, the ADEQ collects compliance data as well as research data at the JLG Supersite via the following EPA monitoring networks: National Core multi-pollutant site (NCore), Photochemical Ambient Monitoring Stations (PAMS), Chemical Speciation Network (CSN), and National Air Toxics Trends Stations (NATTS). The ADEQ also collects air toxics samples for the Urban Air Toxics Monitoring Program (UATMP) at MCAQD’s South Phoenix site. In addition, ADEQ collects PAMS data east of Maricopa County, near Queen Valley, which is in Pinal County. The data from these networks are reported to EPA and should be available in AQS and/or another EPA database. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 26 of 204 In addition to producing an annual network plan, the EPA now requires a five-year network assessment as per 40 CFR Part 58.10. The 5-year assessment is best served by collaborating with EPA, ADEQ, and other local and/or tribal MOs. The first assessment was produced in 2010 and the second was produced in 2015. The assessment process continues to improve, and MCAQD works with other MOs regarding CP network design issues as needed. The MOs within Arizona may provide support to each other by exchanging technical services and/or knowledge when problems arise with instrumentation or when conducting special studies. Basic Air Monitoring Objectives Each ambient air monitor must have a designated basic monitoring objective. The three objectives below apply to establishing required SLAMS monitoring stations and choosing the general locations for additional monitoring sites. This appendix further describes specific requirements for specific pollutants as well as other air monitoring networks not operated by the MCAQD such as NCore, PAMS, PM speciation and O3 precursors. The objectives are not listed based on importance or priority. Each objective is important and must be considered individually. Table 2 shows the three basic objectives. Objective Table 2. Basic SLAMS Air Monitoring Objectives Description Provide air pollution data to the general public in a timely manner Data can be presented to the public in a number of attractive ways including air quality maps, newspapers, MOs and EPA websites, and as part of weather forecasts and public advisories. Support compliance with ambient air quality standards and emissions strategy development Data from EPA-approved monitors for NAAQS pollutants will be used for comparing an area’s air pollution levels. Support for air pollution research studies Supplemental data useful with health effect assessments, atmospheric processes, or monitoring methods development work. Source: 40 CFR Part 58 Appendix D, 1.1(a – c) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 27 of 204 Monitor Types Each pollutant monitor must be designated one of three types. The monitor type is based upon how the data will be used and how long the monitor will remain in operation. Table 3 shows the three monitor types defined by EPA in 40 CFR Part 58. • The first type of monitor is a “State/Local Air Monitoring Station”, or SLAMS. The MCAQD’s air monitoring network is comprised of SLAMS, which gather data for comparison to the NAAQS. The monitors operating within the near-road, NCore, PAMS, NATTS, and UATMP networks are a subset of SLAMS. • The second type of monitor is a “Special Purpose Monitor”, or SPM. The MCAQD may operate SPMs temporarily; however, we did not in 2020. These monitors are useful for gathering and reporting preliminary information regarding air quality in a local area quickly and over a short-term period, which is less than two years. In the event of a geographical area’s population increasing or data indicating that a SLAMS is more appropriate; an SPM may be reclassified to SLAMS and potentially outfitted with a different method. The 40 CFR Part 58.20 Subpart C states that: “An SPM is defined as any monitor included in an agency’s monitoring network that the agency has designated as a special purpose monitor in its annual monitoring network plan and in AQS, and which the agency does not count when showing compliance with the minimum requirements of this subpart for the number and siting of monitor of various types. Any SPM operated by an air monitoring agency must be included in the period assessments and the annual monitoring network plan”. • The third type of monitor is a “Prevention of Significant Deterioration”, or PSD, monitor and it is operated for the purpose of establishing the effect on air quality of the emissions from a proposed source for purposes of preventing significant deterioration to a “protected” area, e.g., a Class 1 area. Class 1 areas include national parks and wilderness areas where a major effort is underway to improve visibility and air quality. There are no Class 1 areas within Maricopa County; however, Arizona does have twelve Class 1 areas under the protection of the Visibility and Regional Haze program. Table 3. Monitor Types Description of Use Name SLAMS EPA-approved, compliance monitor typically operated on a long-term basis. SPM* A monitor typically operated on a short-term basis and not necessarily EPAapproved. PSD A monitor typically operated for less than two years prior to a source opening in a protected Class A area and usually required by the permitting authority. * Reference 40 CFR Part 58 for important EPA’s requirements regarding SPM monitor operation. Usually, if the SPM operates for more than two years and meets 40 CFR Part 58 Appendix D siting requirements, removing it will need prior approval by EPA. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 28 of 204 Site Types To support the three basic monitoring objectives, each site must be identified as one of the six “site types” shown below. Site types may vary within each pollutant’s network. The site type is key to informing air quality professionals and the public about a pollutant’s peak concentration levels. Table 4 shows the site types as defined by EPA. Table 4. Site Types Determine the highest concentra tions expected to occur in the area covered by the network. Measure typical concentrations in areas of high population density (population exposure) . Determine the impact of significant sources or source categories on air quality. Determine general background concentra tion levels. Determine the extent of regional pollutant transport among populated areas and in support of secondary standards. Measure air pollution impacts to visibility, vegeta tion da mage, or other welfare-based impacts . Source: Adapted from 40 CFR Part 58, Appendix D.1 Monitoring Scales (Spatial Scales of Representativeness) To help link the site type with a monitor’s basic monitoring objective and physical location, EPA developed the “spatial scale of representativeness” concept. As per 40 CFR Part 58, Appendix D 1.2 (a) and (b): “The goal in locating air monitors is to correctly match the spatial scale represented by the sample of monitored air with the spatial scale most appropriate for the monitoring site type, air pollutant to be measured and the monitoring objective. Thus, spatial Scale of representativeness is described in terms of physical dimension of the air parcel nearest to a monitoring site throughout which actual pollutant concentrations are reasonably similar”. Table 5 shows six scales of representativeness that are of most interest for the air monitoring site types described above. Table 5. Spatial Scales of Representativeness Name Distance Micro Scale 0 to 100 meters Middle Scale 100 to 500 meters Neighborhood Scale 0.5 to 4 kilometers Urban Scale 4 to 50 kilometers Regional Scale 10s to 100s of kilometers Characterize the nation and the globe as a whole Adapted from 40 CFR Part 58, Appendix D 1.2 National and Global Scales Source: Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 29 of 204 Locating Air Monitoring Sites The air monitoring network is designed to provide pollutant data that represents County-wide “ambient” air quality. EPA defines ambient air as “the air to which the public has access”. Since it is physically and fiscally impossible to monitor the air in every location, each monitor’s objective, the associated site type, and corresponding spatial scale of representativeness most appropriate for the CP to be measured are foremost in determining each site’s location. In addition to correctly integrating the above considerations, a site’s location must also have reasonable accessibility, security, and operating feasibility, such as a property owner’s agreeability to have monitoring conducted on their land and a clean power supply. For example, consider the case where the objective is to determine NAAQS compliance by understanding the maximum O3 concentrations for an area. Such areas would most likely be located downwind of a metropolitan area in a suburban residential area where children and other susceptible individuals are likely to be outdoors. Sites located in these areas are most likely to represent an urban scale of measurement. In this example, O3 precursor emission patterns, public activity, and meteorological characteristics that affect O3 formation and dispersion were considered when selecting an O3 monitoring site’s physical/geographical location; and, the spatial scale of representativeness was a result of the selection process. When applying these principles, the total quantity of monitoring sites that will serve the variety of data needs is often substantially higher than federal minimum requirements. The optimal size of each pollutant’s network involves compromises among data needs and available resources; and, a network’s size can change over time. Each pollutant’s network must be dynamic enough to maintain a current representative sampling of the air quality. Overview of the Air Monitoring Sites According to the U.S. Census Bureau, Maricopa County’s most recent population estimate is 4,485,414 people (U.S. Census Bureau: Quick Facts 2019 Population Estimate for Maricopa County). As per 40 CFR Part 58, the EPA mandates the minimum quantity of monitors required by a pollutant’s network to properly represent the County’s population. As previously mentioned, the MCAQD pollutant networks are designed using the concept of spatial scale representativeness and monitoring objectives. This results in CP networks that meet, and in most cases exceed, the minimum quantity of monitors required by EPA. Additional information on the siting of air monitors can be found in the Appendix II. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 30 of 204 Table 6 shows details regarding the MCAQD’s site names and abbreviations (code), their AQS identification numbers, and geographic location information for site operating in 2020. Table 6. 2020 Air Monitoring Site Information Name Code AQS ID# Latitude Blue Point BP 04-013-9702 33.54558 Buckeye BE 04-013-4011 33.36985 Cave Creek CC 04-013-4008 33.82169 Central Phoenix CP 04-013-3002 33.45797 Durango Complex DC 04-013-9812 33.42650 Dysart DY 04-013-4010 33.63718 Falcon Field FF 04-013-1010 33.45224 Fountain Hills FH 04-013-9704 33.61092 Glendale GL 04-013-2001 33.30995 Higley HI 04-013-4006 33.30995 Humboldt Mountain HM 04-013-9508 33.98280 Mesa ME 04-013-1003 33.41018 North Phoenix NP 04-013-1004 33.56034 Pinnacle Peak PP 04-013-2005 33.70639 South Phoenix SP 04-013-4003 33.40314 South Scottsdale SS 04-013-3003 33.47968 Tempe TE 04-013-4005 33.41123 Thirty-Third TT 04-013-4020 33.46173 West Chandler WC 04-013-4004 33.40635 rd West 43 Avenue WF 04-013-4009 33.29896 West Phoenix WP 04-013-0019 33.48378 Zuni Hills ZH 04-013-4016 33.68719 Source: EPA AQS database – Site Description Report (AMP380) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Longitude -111.60972 -112.62068 -112.01726 -112.04659 -112.11821 -112.34185 -111.73327 -111.72534 -111.72003 -111.72003 -111.79871 -111.86536 -112.06627 -111.85575 -112.07526 -111.91711 -111.93471 -112.12796 -112.14426 -111.88426 -112.14256 -112.29416 Location Usery Pass & Bush Hwy. MC Hwy. 85 & AZ Hwy. 85 32nd St. & Carefree Hwy. 19th St. & Roosevelt St. 27th Ave. & Durango St. Bell Rd. & Dysart Rd. McKellips Rd. & Greenfield Rd. E. Palisades Blvd. & Fountain Hills Blvd. 59th Ave. & W. Olive Ave. Higley Rd. & Williams Field Rd. Top of Humboldt Mountain Broadway Rd. & Alma School Rd. 7th St. & Dunlap Ave. Alma School Rd. & Happy Valley Rd. Central Ave. & Broadway Rd. Scottsdale Rd. & Miller Rd. College Ave. & Apache Blvd. Interstate 10 & 33rd Ave. Ellis St. & Frye Rd. rd 43 Ave. & Broadway Rd. 39th Ave. & Earll Dr. th 109 Ave. & Deer Valley Rd. Page 31 of 204 Figure 7 provides the complement of air monitoring instruments operating at each site in 2020. Figure 7. 2020 Air Monitoring Instruments by Site Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 32 of 204 2020 SUMMARY OF NETWORK RESULTS AND REQUIRED INFORMATION Determining Data Quality and Acceptability This section details the results obtained from our 2020 monitoring year. The EPA has established data quality and measurement quality objectives for CP data. In addition to 40 CFR Part 58, the EPA QA Handbook for Air Pollution Measurement Systems: “Volume II: Ambient Air Quality Monitoring Program provides extensive information regarding the quality system and its components. There are seven data quality indicators (DQI) established by the EPA to determine the quality of ambient air data. Data must meet each indicator’s requirement to be certified and acceptable for use by decision makers for NAAQS compliance determinations, researchers, and the public. These indicators are precision, bias, completeness, comparability, detectability, representativeness, and sensitivity. “Timeliness” of data collection, validation, and upload to AQS are important as well. “Accuracy” is now defined as a measure of the overall agreement of a measurement to a known value and includes a combination of random error (precision) and systematic error (bias) components of both sampling and analytical operations. The AMD’s personnel evaluate data using these indicators, with precision, bias, and completeness being the most crucial to evaluate on an ongoing basis. Data Completeness Before considering any data set valid, it must first pass a data recovery, or completeness, test. The test requirements begin with checking completeness at hourly and 24-hour concentration values. These values may be referred to as “samples”. The CP pollutant data measurements from continuous analyzers are based on a valid hour, while filter samples from manual samplers are based on a 24-hour sampling period from midnight to midnight. Equation 1 shows the calculation for the data completeness percentage, which is the quantity of valid measurements divided by the quantity of scheduled measurements multiplied by 100. For CP data, completeness must be greater than 75% for a data set to pass the first validity test. Furthermore, CP data completeness requirements may vary and use multiple levels of data aggregation, e.g., 1-hour, 3hour, 8-hour, 24-hour, quarterly, annual, and multiple years. Equa tion 1: Qty. of Valid Measurements Data Completeness Percentage = Qty. of Measurements Scheduled (100) Table 7 shows the pollutant data completeness percentages for 2020. Table 7. 2020 Criteria Pollutant Data Completeness for SLAMS Pollutant CO O3 NO2 SO2 PM2.5 PM10 TOTAL Percent Complete 96.7 97.5 97.0 96.5 95.8 97.2 96.9 Source: EPA AQS database – 2020 Data Completeness Report (AMP430) Final – 2020 Air Monitoring Network Review and 2021 Plan June 23, 2020 Page 33 of 204 Increasing Data Volumes Due to increasing data requirements and the availability of FEM analyzers, the amount of data the AMD produces increased considerably over the past few years. Operating and maintaining the various components of each air monitoring network is an ongoing challenge. To remain current with EPA’s requirements and to meet decision makers and researchers’ data needs, AMD personnel adjust standard operating procedures according to EPA’s latest requirements and/or guidance to ensure only high-quality data are being produced. In addition to the increased amount of CP data generated and managed, supporting components of the surveillance system such as the communications system to the sites and the database used for data management also need continuing upgrades. So far, AMD has managed to make significant program changes to keep up with the increasing demand for data. By automating some processes, we have been able to successfully respond to data needs without increases to personnel. The following information summarizes a few notable changes that have been implemented to date. • The commercial database, AirVision™, has enhanced our ability to manage the increase in data volume. It has helped to advance data validation and dissemination, as well as data retrieval/storage/security. The database must be maintained and updated regularly to keep up with software changes involving data collection, validation, and reporting to AQS. • AirVision™ also allows AMD personnel to perform multiple data checks throughout the workday to help prevent bad data from being released to the public via the County and EPA’s websites. In addition, it is used to upload preliminary data to the MC website as close as possible to real-time. • A Rapid Response Notification System (RRNS) was implemented to better manage quickly developing pollution events. The RRNS uses automated alarms to monitor instrument performance and incoming pollutant concentrations. The triggering instrument warning and pollutant concentration levels can be adjusted as needed for each alarm. The AirVision™ database is programmed to automatically generate these alerts. Table 8 shows the approximate amount of hourly and 5-minute data produced in 2020. In addition, AMD is now producing 1-minute pollutant and meteorological data. Table 8. Approximate Amount of 2020 Data Produced Type 1-Hour CP Data 1-Hour CP and Met Data 1-Hour, 5-Minute and 24Hour CP and Met Data Amount ~568,679 ~1,010,000 ~10,000,000 Source: MCAQD AirVision™ database Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 34 of 204 Summary of 2020 Criteria Pollutant Data This section covers the 2020 data generated by each CP’s network. Carbon Monoxide (CO) Figure 8 shows the seven CO monitoring sites operating in 2020. The network is comprised of seven yearround CO monitors. A CO monitor is required at one MCAQD near-road site. Therefore, the Thirty-Third site began temporarily monitoring for CO while the new near-road site replacing Diablo is under construction. The CO data were reported to AQS, and the data are suitable for comparison to the NAAQS. There are two primary NAAQS levels for CO: an 8-hour average of 9 ppm and a 1-hour average of 35 ppm. A violation of either standard is based on two exceedances in a calendar year. Figure 8. 2020 CO Monitoring Site Map Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 35 of 204 The Phoenix metropolitan area was once designated as being in moderate nonattainment for CO for the 1971 primary NAAQS. A nonattainment SIP was developed by ADEQ that covered how to reduce and maintain CO concentrations. The area failed to reach attainment by the end of 1995, which caused EPA to reclassify the area to serious nonattainment in 1996, with a new attainment date of December 31, 2000. In response, the Governor’s Office, Legislature, Maricopa County, and other entities worked cooperatively to find ways to reduce CO that included implementing innovative programs such as a nationally recognized, enhanced vehicle emissions inspection program, a cleaner burning gasoline program, pollution reduction measures for commercial and industrial sources, and woodburning restrictions. As a result, CO concentrations declined, and data showed that the area had reached attainment with the 8-hour primary NAAQS. In April 2005, the EPA redesignated the Phoenix metropolitan area to attainment for CO and approved the attainment demonstration and maintenance plan, which shows how the area will maintain compliance with the CO NAAQS through 2015. However, Maricopa County must continue to show that the air quality is maintaining compliance with the NAAQS for a period of 20 years from the attainment determination. The area is now covered by a 10-year maintenance SIP. In 2020, no exceedances of the 1-hour or 8-hour CO NAAQS occurred at any MCAQD sites, and concentrations remained well below NAAQS levels. Since 1-hour CO concentrations have been significantly lower than the NAAQS level for many years, we have not included this metric on a table. Table 9 shows the maximum and second maximum 8-hour CO averages measured. Table 9. 2020 8-hour CO Average Data Summary CO 8-hour Average CO 8-hour Average 2nd Site Maximum Maximum (ppm) (ppm) Buckeye 0.7 0.6 Central Phoenix Mesa South Phoenix 1.9 1.6 2.2 1.9 1.2 1.8 *Thirty-Third 2.9 West Chandler 1.3 West Phoenix 3.0 * - Site temporarily monitoring for CO in 2020 Source: 2.6 1.3 2.5 EPA AQS database – 2020 Quicklook Criteria Report (AMP450) Table 10 shows additional CO information required by EPA for the Phoenix core-based statistical area (CBSA), which includes Maricopa and Pinal Counties. CBSA 38060 Source: Table 10. 2020 CO Data Required by EPA Population & Required Active Census Year Near-Road Near-Road (2019) Monitors Monitors 4,485,414 1 1 Additional Near-Road Monitors Needed 0 U.S. Census Bureau: Quick Facts 2019 Population Estimate for Maricopa County Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 36 of 204 Nitrogen Dioxide (NO2) Figure 9 shows the four NO2 monitoring sites operating at the beginning and end of 2020. The NO 2 monitors are designated as SLAMS; however, two are further sub-designated as being “near-road” monitors. At the Buckeye, Central Phoenix, and West Phoenix sites, the monitors are area-wide monitors and represent the NO2 concentrations within Maricopa County. The Thirty-Third monitor is a near-road monitor representing the microscale by collecting source-oriented emissions from vehicular traffic on heavily travelled highways within Maricopa County. The near-road network requires two NO2 monitors in the metropolitan area. The Diablo site replacement location was approved in 2020 by EPA R9. The new nearroad site will open in 2021 and will house the second near-road NO2 monitor. Figure 9. 2020 NO2 Monitoring Site Map Data from both the area-wide and near-road monitors were reported to AQS, and the data are suitable for comparison to the NAAQS. Maricopa County is in attainment for NO2. Compliance with the NO2 standard is achieved when the annual arithmetic mean concentration in a calendar year is less than or equal to 53 ppb. A new hourly standard for NO2 began in 2010; this regulation states that the 3-year average of the 98th Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 37 of 204 percentile cannot exceed 100 ppb. Table 11 shows that no exceedances or violations of the NO 2 annual or 1-hour NAAQS were recorded at Maricopa County monitoring sites in 2020. Site Name Table 11. 2020 NO2 1-hour Data Summary NO2 NO2 NO2. 3-Year Average of Maximum 98th Percentile the 98th (ppb) (ppb) Percentiles (ppb) NO2 Annual Average (ppb) Buckeye 45.0 36.0 34.3 8.12 Central Phoenix 61.0 54.0 54.0 15.93 Thirty-Third 65.0 57.0 59.0 25.11 West Phoenix 54.0 48.0 49.0 13.36 Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP450) Additional information required by EPA for the near-road NO2 monitors is shown in Table 12. The annual average daily traffic (AADT) count is provided by MAG. This year, as per MAG’s data, the highest AADT was 204,528 at the Loop 202/I-10 interchange. The Broadway Curve had the highest count in 2018, and if modelled may show the highest count in 2020. CBSA Population & Census Year (2019) Table 12. 2020 NO2 Data Required by EPA Max Required Active Needed Required AADT NearNearNearAreaCounts Road Road Road Wide (2019) Monitors Monitors Monitors Monitors 38060 4,485,414 204,528 Sources: 2 2 0 1 Active AreaWide Monitors Needed AreaWide Monitors 4 0 U.S. Census Bureau: Quick Facts 2019 Population Estimate for Maricopa County MAG - Transportation Data Management System for AADT Counts Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 38 of 204 Ozone (O3) Figure 10 shows the seventeen O3 monitors operating at the beginning and end of 2020. The O3 monitors are designated as SLAMS. The data were reported to AQS, and data are suitable for use with NAAQS comparisons. Figure 10. 2020 O3 Monitoring Site Map As stated in the O3 summary, compliance with the NAAQS is determined by averaging the fourth highest 8-hour average over a 3-year period. Currently, this 3-year average must be less than or equal to 0.070 ppm. The 8-hour NAAQS is violated when a 3-year average using the fourth highest concentration measured in each year exceeds 0.070 ppm. In 2020, thirty-four days exceeded the 2015 8-hour primary standard for O3 , and fifteen sites violated the 2015 NAAQS. In 2020, sixteen exceedance days appear to have been influenced by wildfire smoke. If EPA R9 concurs, the O3 concentrations affected by EEs will not be used to determine compliance with the NAAQS. To view EE information related to O3, see the 2020 O3 Exceedance, Violation, and Exceptional Event Information section. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 39 of 204 Table 13 presents the 2020 8-hour O3 data summary, including EE data. Site Table 13. 2020 O3 Eight-hour Average Summary 1st 8-hr 2nd 8-hr 3rd 8-hr 4th 8-hr Maximum Maximum Maximum Maximum (ppm) (ppm) (ppm) (ppm) Qty. of Days > 0.070 ppm Blue Point 0.094† 0.087† 0.087† 0.082† 16 Buckeye 0.084† 0.077† 0.070 0.069 2 Cave Creek 0.086† 0.084† 0.083† 0.079† 14 Central Phoenix 0.073† 00.073† 0.072† 0.072† 7 Dysart 0.091† 0.088† 0..085† 0.077† 15 Falcon Field 0.089† 0.088† 0.085† 0.084† 20 Fountain Hills 0.092† 0.088† 0.084† 0.080† 8 Glendale 0.086† 0.083† 0.077† 0.076† 5 Humboldt Mt. 0.078† 0.077† 0.074† 0.074† 6 Mesa 0.093† 0.089† 0.086† 0.081† 15 North Phoenix 0.094† 0.093† 0.090† 0.087† 15 Pinnacle Peak 0.094† 0.086† 0.083† 0.083† 13 South Phoenix 0.086† 0.085† 0.077† 0.075† 5 South Scottsdale 0.102† 0.093† 0.091† 0.084† 18 Tempe 0.080† 0.077† 0.077† 0.075† 11 West Chandler 0.081† 0.081† 0.077† 0.075† 5 West Phoenix 0.091† 0.089† 0.081† 0.079† 10 † - Indicates an exceedance of the 2015 8-hr NAAQS Source: EPA AQS database - 2020 Quicklook Criteria Report (AMP450) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 40 of 204 Table 14 shows additional information required by EPA. Table 14. 2020 O3 Data Required by EPA CBSA 38060 County Maricopa Population & Census Year (2019) 4,485,141 3-Year Design Value 3-Year Design Value Site(s) 0.079 AQS ID 04-013-2005 Site Name Monitoring Organization Pinnacle Peak MCAQD 8-Hour Maximum Concentration MCAQD 8-Hour Maximum Concentration Site(s) 0.102 AQS ID 04-013-3003 Site Name South Scottsdale MSA Maximum 8-Hour Concentration 0.102 AQS ID MSA Maximum Concentration Site(s) MCAQD 04-013-3003 Site Name Monitoring Organization South Scottsdale MCAQD Required Monitors 3 Active Monitors 18 Additional Monitors Needed 0 Sources: EPA AQS database – 2020 Quicklook Criteria Report (AMP450) U.S. Census Bureau: Quick Facts 2019 Population Estimate for Maricopa County Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 41 of 204 Lead (Pb) The primary and secondary Pb NAAQS levels are identical. Either is violated if a rolling 3-month average exceeds 0.15 µg/m3. The Phoenix metropolitan area is in attainment with the Pb NAAQS. The MCADQ conducted Pb monitoring at the Deer Valley Airport for more than ten years. The results showed that airborne Pb concentrations are well below the Pb NAAQS. In addition, Pb emissions from the airport have decreased since monitoring began. In lieu of this information, EPA R9 approved MCAQD discontinuing Pb monitoring at the airport. The last Pb air sample was collected on December 29, 2019. The 2008 Pb NAAQS requires ambient Pb monitoring at NCore stations around the U.S.; and ADEQ monitors for Pb at the local NCore station at JLG Supersite (04-013-9997) in Phoenix. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 42 of 204 Particulate Matter ≤10 Micrometers (PM10) Figure 11 shows the fifteen PM10 monitors operating at the beginning and end of 2020. The PM10 monitors are designated as SLAMS and data are suitable for comparison to the NAAQS. All PM10 monitoring stations operate continuous PM10 analyzers that collect 5-minute and hourly averaged data. It is worth noting that EPA does not require PM10 analyzers to be collocated at the PQAO level or the national level. Figure 11. 2020 PM10 Monitoring Site Map The PM10 NAAQS are violated when the expected number of exceedances at a monitor is more than one per year on average over three years. The expected number of exceedances for a site is estimated using a formula provided in 40 CFR Part 50 Appendix K. The formula takes into account the number of days sampling occurs and the number of valid samples that can be collected. A 3-year average of these estimated days is then used to determine compliance. Effective December 18, 2006, EPA revoked the PM10 annual primary standard; however, the annual weighted average is displayed on Table 15 for informational purposes. In recent years, some PM10 exceedances occurring in the Maricopa County CBSA have been successfully attributed to an EE. Again, as per the EPA’s Exceptional Event Rule, an EE is an uncontrollable event that was caused by natural sources of pollution or an event that is not expected to recur at a given location. ADEQ makes the determination of which events to classify as exceptional, then they submit documentation to EPA supporting the contention that the exceedance(s) was due to an EE. If EPA R9 concurs, the PM10 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 43 of 204 concentrations affected by EEs will not be used to determine compliance with the NAAQS. To view EE information related to PM10, see the 2020 PM10 Exceedance, Violation, and Exceptional Event Information section. In 2020, there were four exceedance days of the 24-hour PM10 NAAQS, and six sites had at least one exceedance day. The sites are: Buckeye, Central Phoenix, South Scottdale, West Chandler, West 43rd, and West Phoenix. Table 15 shows the 2020 PM10 24-hour maximum and second maximum daily averages and the expected exceedance rates by site, including EE data. Table 15. 2020 PM10 24-Hour Data Summary Including EE Data 2nd Maximum 24- Maximum Number of Expected 24-hour Hour Average 24-Hour Site Name Exceedance NAAQS Average Rate (µg/m3) Exceedances 3 (µg/m ) Buckeye 165†‡ 138 1 1 Central Phoenix 214†‡ 100 1 1 Annual Weighted Average (µg/m3) 45.8 37.4 Durango Complex 141 100 0 0 39.3 Dysart 136 94 0 0 28.0 Glendale 76 68 0 0 20.1 Higley 131 107 0 0 39.2 Mesa 129 76 0 0 21.5 North Phoenix 116 54 0 0 20.5 South Phoenix 98 94 0 0 34.2 South Scottsdale 192†‡ 107 1 1 28.3 Tempe 134 87 0 0 22.4 West Chandler 263†‡ 89 1 1.1 30.7 West 43 Avenue 226†‡ 199†‡ 3 3.1 58.2 West Phoenix 159† 120 1 1 30.8 Zuni Hills 111 88 0 0 † - Indicates an exceedance of the standard ‡ - Data are associated with exceptional event flag Sources: EPA AQS database - 2020 Quicklook Criteria Report (AMP450) 25.4 rd Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 44 of 204 Table 16 shows additional information required by EPA. Data include measurements submitted as EEs. Table 16. 2020 PM10 Data Required by EPA CBSA 38060 County Maricopa Population & Census Year (2019) 4,485,414 MCAQD Maximum 24-Hour Concentration MCAQD Maximum Concentration for Site 263 AQS ID 04-013-4004 Site Name West Chandler MSA Maximum 24-Hour Concentration MSA Maximum Concentration Site 1228 AQS ID 04-021-3014 Site Name Eloy Monitoring Organization PCAQCD Required Monitors 6-10 Active Monitors 16 Additional Monitors Needed 0 Sources: EPA AQS database – 2020 Quicklook Criteria Report (AMP450) U.S. Census Bureau: Quick Facts 2019 Population Estimate for Maricopa County Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 45 of 204 Particulate Matter ≤2.5 Micrometers (PM2.5) Figure 12 shows the eight PM2.5 sites operating at the beginning and end of 2020. All PM2.5 monitors are designated as SLAMS. Data were reported to AQS, and data are suitable for comparison to the NAAQS. The PM2.5 monitoring network is representative of area-wide air quality in respect to fine particulate with the exception of the monitor at Thirty-Third, which is a near-road monitoring site. Figure 12. 2020 PM2.5 Monitoring Site Map Each PM2.5 site operates a continuous FEM monitor that provides hourly concentration data used for NAAQS comparison. The West Phoenix site remains our “collocated” site for PM2.5, which means that we operate one FEM continuous analyzer designated as the “primary monitor” and one FRM filter-based PM2.5 sampler designated as the “secondary monitor”. The FRM sampler collects a filter sample every 12 days for QA purposes. The secondary monitor is required to meet the EPA’s QA collocation requirements for the PM2.5 network. The EPA may reference data from the secondary monitor to better evaluate air quality in the area. In addition to the secondary monitor’s data being used for QA purposes, if necessary, the data can be substituted for the primary monitor’s data as per 40 CFR Part 50 Appendix N. This secondary monitor collects a 24-hour filter sample from midnight-to-midnight on the designated 1:12 day schedule as required Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 46 of 204 for collocated QA samples. The U.S. EPA OAQPS produces the annual sampling calendar each year and posts it on the AMTIC website. Maricopa County is currently in attainment for PM2.5. The MCAQD continually assesses the existing network to ensure it adequately represents air quality in Maricopa County regarding PM2.5. To determine compliance with the annual PM2.5 NAAQS requires that three years of the annual average of 24-hour data be used from each monitor. To determine compliance with the 24-hour NAAQS requires that three years of the 98th percentile data be used from each PM2.5 monitor. For data to be acceptable for comparison to the annual and the 24-hour NAAQS, a site’s PM2.5 monitor must meet all EPA-required operating and QA criteria. Required General Statement Regarding Cha nges to the PM 2.5 Network In the event MCAQD needed to move or change a violating PM2.5 monitor, this procedure would be followed. MCAQD would hold a public hearing regarding the requested change. Details and documentation of the requested change, as well as all public comments, would then be forwarded to the EPA R9 for approval. Any action on MCAQD’s part will be dependent on EPA R9 approval. Please note that this statement is general in nature and required in this AMNRP by 40 CFR Part 58. MCAQD does not currently have any violating PM2.5 monitors, nor does it have any proposals to move any PM2.5 monitors. 2020 PM 2.5 Data Summary Table 17 summarizes the 24-hour and annual data from the primary monitors only, including EE data values if any. Table 17. 2020 PM2.5 24-Hour and Annual Averages Including EE Data Maximum 2nd Maximum 98th Percentile Annual 24-Hour Average 24-Hour Average 24-Hour Average Average Site Name Concentration Concentration Concentration Concentration 3 3 3 (µg/m ) (µg/m ) (µg/m ) (µg/m3) Durango Complex 76.3† 54.7† 28.8 10.52 Glendale 64.9† 21.0 19.0 7.63 Mesa 20.6 19.7 17.4 7.30 North Phoenix 51.4† 25.5 18.4 7.88 South Phoenix 64.7† 63.0† 34.1 10.45 Tempe 19.4 18.3 15.6 6.78 Thirty-Third 141.4† 69.4† 36.7† 13.18†* West Phoenix 149.1† 63.0† 33.9 10.47 † - Indicates an exceedance of the standard. * - Indicates that the mean does not satisfy summary criteria, e.g., data completeness Source: EPA AQS database – 2020 Quicklook Criteria Report (AMP450) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 47 of 204 The Annual PM2.5 NAAQS Status Compliance with the primary and secondary annual NAAQS is determined by averaging three consecutive years of a site’s annual mean value using the 24-hour, or daily, concentrations. The annual PM2.5 NAAQS is met when the 3-year annual average concentration is less than or equal to 12.0 µg/m3 at each eligible monitoring site. All 3-year averages were below the PM2.5 annual NAAQS. Table 18 summarizes the 3-year annual average data. Table 18. PM2.5 3-Year Annual Averages 2018 2019 2020 Annual Annual Annual Site Name Average Average Average Concentration Concentration Concentration (µg/m3) (µg/m3) (µg/m3) Durango Complex 10.10 8.38 10.52 Glendale 7.33 6.34 7.63 Mesa 7.42 5.20 7.30 North Phoenix 7.35* 6.31 7.88 South Phoenix 9.37 7.48 10.45 Tempe 7.11 5.79 6.78 Thirty-Third not operating not operating 13.18†* West Phoenix 9.92 8.17 10.47 † - Indicates an exceedance of the standard * - Indicates that the mean does not satisfy summary criteria, e.g., data completeness Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP450) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 3-Year Annual Average Concentration (µg/m3) 9.66 7.10 6.64 7.18* 9.10 6.56 not available 9.52 Page 48 of 204 2020 24-Hour PM2.5 NAAQS Status Compliance with the primary and secondary 24-hour PM2.5 NAAQS is determined by averaging 3consecutive years of the 24-hour 98th percentile concentration values from all eligible sites. The 24-hour NAAQS is met when 3-year average concentration values is less than or equal to 35 µg/m3. In 2020, there were eleven exceedance days, but no violations of the primary or secondary 24-hour NAAQS occurred. Table 19 summaries the 3-year 24-hour 98th percentile data from the FEM analyzers. Table 19. PM2.5 3-Year 24-Hour Averages of the 98th Percentile 2018 2019 2020 98th Percentile 98th Percentile 98th Percentile Site Name 24-Hour Average 24-Hour Average 24-Hour Average Concentration Concentration Concentration (µg/m3) (µg/m3) (µg/m3) Durango Complex 25.7 21.7 28.8 Glendale 19.5 15.1 19.0 Mesa 19.1 11.1 17.4 North Phoenix 18.7 14.5 18.4 South Phoenix 27.8 21.4 34.1 Tempe 16.3 11.9 15.6 Thirty-Third not operating not operating 36.7 West Phoenix 30.6 23.4 33.9 * - Indicates that the mean does not satisfy summary criteria, e.g., data completeness Source: EPA AQS database – 2018 - 2020 Quicklook Criteria Report (AMP450) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 3-Year 98th Percentile 24-Hour Average Concentration (µg/m3) 25.4 17.8 15.8 17.2 27.7 14.6 not available 29.3 Page 49 of 204 Table 20 shows additional information required by EPA. The PM2.5 annual and daily design values include any measurements submitted as an EE for EPA’s concurrence. In 2020, there were no EEs submitted for PM2.5 exceedances. Maricopa County operates more than the required minimum number of PM2.5 monitors for the CBSA. Table 20. 2020 PM2.5 Data Required by EPA CBSA 38060 County Maricopa Population & Census Year (2019) 4,485,414 MCAQD Annual Design Value 9.7 µg/m3 MCAQD Annual Design Value Site AQS ID 04-013-9812 Site Name Durango Complex MCAQD 24-Hour Design Value MCAQD 24-Hour Design Value Sites 28 µg/m3 AQS ID 04-013-4003 Site Name South Phoenix MCAQD Max 24-Hour Concentration MCAQD Max 24-Hour Concentration Site 149.1 µg/m3 AQS ID 04-013-0019 Site Name West Phoenix MSA Max 24-Hour Concentration MSA Max 24-Hour Concentration Site 149.1 µg/m3 AQS ID 04-013-0019 Site Name West Phoenix Monitoring Organization MCAQD Required Monitors 3 Active Monitors 8 Additional Monitors Needed 0 Sources: EPA AQS database - 2020 Preliminary Design Value Report (AMP480) and 2020 Quicklook Criteria Parameter Report (AMP450) U.S. Census Bureau: Quick Facts 2019 Population Estimate for Maricopa County Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 50 of 204 Sulfur Dioxide (SO2) Figure 13 shows the two SO2 SLAMS monitors operating at the beginning and end of 2020. The data were reported to AQS, and the data are suitable for NAAQS comparison. Figure 13. 2020 SO2 Monitoring Site Map Sulfur dioxide has a 1-hour primary standard and a 3-hour secondary standard. The 24-hour and annual average standards were revoked in a June 2010 rulemaking. A violation of the primary standard occurs when the 3-year average of the 99th percentile of the daily maximum 1-hour average exceeds 75 ppb. A violation of the secondary standard occurs when a 3-hour average of 500 ppb is exceeded more than once per year. Maricopa County is in attainment for SO2 . In 2020, no exceedances of the SO2 primary 1-hour or secondary 3-hour standard were recorded at Maricopa County monitoring sites; and no site violated the SO2 NAAQS. The EPA now requires that the highest 5minute average per hour per day be reported to AQS; however, there is not a 5-minute SO 2 NAAQS level. The EPA no longer requires the reporting of 3-hour values for the SO 2 secondary NAAQS. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 51 of 204 Table 21 shows the SO2 data summary. Site Table 21. 2020 SO2 Data Summary 1-hour 1-hour Maximum 2nd Maximum Concentration Concentration (ppb) (ppb) 1-hour 99th Percentile (ppb) Central Phoenix 6.0 5.0 5.0 Durango Complex 8.0 8.0 7.0 Source: EPA AQS database – 2020 Quicklook Criteria Parameters Report (AMP450) The minimum required quantity of SO2 monitors operating within the MCAQD’s network is based on either the Population Weighted Emissions Index (PWEI) and/or the EPA R9 Administrator’s input (see 40 CFR Part 58 - Appendix D 4.4.3). The below was the most current information found online for SO2 emissions, we will continue to update as newer data is available. Table 22 shows additional information required by EPA. CBSA County 38060 Maricopa Sources: Table 22. 2020 SO2 Data Required by EPA Population Total SO2 Population & Census Emitted Weighted Required Year (2014) Emission Monitors (2019) (tpy) Index 4,485,414 1177 3810 0 Active Monitors Additional Monitors Needed 2 0 The EPA’s National Emissions Inventories (NEI) database – 2014 NEI Data U.S. Census Bureau: Quick Facts 2019 Population Estimate for Maricopa County Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 52 of 204 Summary of 2020 Criteria Pollutant NAAQS Status This section summarizes information regarding the status of each pollutant relative to its NAAQS level. It also provides detailed information regarding pollutants that are in NAAQS violation. Table 23 summarizes the 2020 NAAQS exceedances and violations by pollutant. Pollutant CO NO2 O3 PM10 PM2.5 SO2 Table 23. 2020 NAAQS Exceedances and Violation Summary NAAQS Status No exceedances or violations of the 1-hour or 8-hour primary 2011 NAAQS occurred. No exceedances or violations of the 1-hour or annual primary 2010 NAAQS or annual secondary 2012 NAAQS occurred. On thirty-four unique days, at least one monitor exceeded the 2015 8-hour primary / secondary NAAQS. Fifteen sites will violate the 2015 8-hour primary / secondary NAAQS unless EPA R9 concurs with the EE demonstration submittals. If approved, then eight sites will violate the NAAQS. On four unique days, at least one monitor exceeded the 24-hour primary / secondary 1987 NAAQS. Seven sites will violate the primary / secondary 1987 NAAQS unless EPA R9 concurs with the EE demonstration submittals. If submittals are approved, then no site will violate the NAAQS. On eleven unique days, at least one monitor exceeded the 2012 24-hour primary / secondary NAAQS, but no sites violated the 24-hour or annual primary / secondary 2012 NAAQS. No exceedances or violations of the primary annual or 1-hour 2010 NAAQS or the annual secondary 2010 NAAQS occurred. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 53 of 204 2020 O3 Exceedance, Violation, and Exceptional Event Information This section discusses the monitoring results of the O3 network in 2020 and the 2015 NAAQS violation status based upon years 2018 through 2020. O3 NAAQS Exceedances The 2015 O3 NAAQS level of 0.070 ppm is exceeded when a rolling 8-hour average is 0.071 ppm or higher. Thirty-four exceedance days occurred in 2020. On the next page, Figure 14 shows the O3 2020 exceedance dates and concentrations by site for the 2015 NAAQS. Exceedance day values associated with an EE are shown in red. O3 Exceptional Events and Status of EPA Concurrence Sixteen exceedance days appear to be influenced by smoke from wildfires, and EE packages are being developed for submittal to EPA. The EPA has yet to concur or not with the EE demonstration packages before O3 data can be omitted from NAAQS comparisons. The concentrations include hourly O3 data that are flagged as an EE with the qualifier code indicated. Final – 2020 Air Monitoring Network Review and 2021 Plan June 23, 2020 Page 54 of 204 Figure 14. 2020 O3 Exceedance Days Source: MCAQD AirVision™ database Final – 2020 Air Monitoring Network Review and 2021 Plan June 23, 2020 Page 55 of 204 O3 NAAQS Violation Status - Including Exceptional Event Data A site violates the 2015 O3 NAAQS when its 3-year average of the 4th highest rolling 8-hour average concentration measured during a year exceeds 0.070 ppm. This section shows the sites that violate the 2015 O3 NAAQS, and it includes 2018 and 2020 data associated with EE submittals. Figure 15 shows a graph of the sites that violated the 2015 O3 NAAQS in 2020. If the EPA does not concur with the EE demonstration packages submitted for 2018 through 2020, then, 15 sites within the MCAQD network will violate the O3 NAAQS. The sites that violated the 2015 NAAQS in 2020 are: Blue Point, Cave Creek, Central Phoenix, Dysart, Falcon Field, Fountain Hills, Glendale, Humboldt Mountain, Mesa, North Phoenix, Pinnacle Peak, South Phoenix, South Scottsdale, West Chandler, and West Phoenix. Figure 15. 2020 O3 2015 NAAQS Violations Including EE Data Source: AQS 2018- 2020 O3 8-Hour Maximum Values Report (AMP440) Final – 2020 Air Monitoring Network Review and 2021 Plan June 23, 2020 Page 56 of 204 If EPA concurs with EE submittal packages, then eight sites will violate the NAAQS. The sites are: Blue Point, Cave Creek, Central Phoenix, Falcon Field, Mesa, North Phoenix, Pinnacle Peak, and South Scottsdale. Figure 16 shows the sites that will violate the 2015 O3 NAAQS when EE data is removed. Figure 16. 2020 Ozone 2015 NAAQS Violations Excluding EE Data Source: AQS 2018- 2020 O3 8-Hour Maximum Values Report (AMP440) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 57 of 204 2020 PM10 Exceedance, Violation, and Exceptional Event Information This section discusses the monitoring results of the PM10 network in 2020 and NAAQS violation status based upon years 2018 - 2020. PM10 NAAQS Exceedances A PM10 exceedance occurs when a monitor’s 24-hour average concentration from midnight-to-midnight is 155.5 µg/m3 or higher. Figure 17 shows the site and date of PM10 exceedances that occurred in 2020. All 2020 exceedances of the PM10 NAAQS qualify for EE consideration and demonstration packages will be developed for EPA’s review. The 24-hour concentrations shown below include hourly PM10 data flagged as an EE. Source: Figure 17. 2020 PM10 Exceedance Days MCAQS AirVision™ database PM10 Exceptional Events and Status of EPA Concurrence Table 24 shows the EE qualifier associated with each exceedance. Please note that data holding EE concurrence from EPA are not included when determining compliance with the NAAQS. Table 24. 2020 PM10 Exceptional Event Information PM10 24-Hour Average EE Exceedance Site Concentration Qualifier Date (µg/m3) Code 01/01/20 West Phoenix 159 rh Central Phoenix 214 South Scottsdale 192 08/16/20 West Chandler 263 rd West 43 199 rj 08/17/20 West 43rd 186 Buckeye 165 10/26/20 West 43rd 226 Source: EPA AQS database – 2020 PM10 Maximum Values Report (AMP440) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Qualifier Code Description fireworks high winds Page 58 of 204 This following information contrasts the PM10 NAAQS violation status with and without EE data. The EPA has yet to concur or not with EE demonstration package submittals for 2018 through 2020. PM10 24-Hour NAAQS Violation Status - Including Exceptional Event Data As per 40 CFR Part 50.6 (a), a site violates the primary and/or secondary 24-hour PM10 NAAQS when the calculated “rate of expected exceedances” is greater than one (> 1) when averaged over three consecutive years. Table 25 includes EE data and shows the maximum three-year 24-hour PM10 averages, the calculation of expected exceedances for each year, and the calculation of three-year average for the rate of expected exceedances. If the EPA does not concur with the EE demonstration packages submitted for years 2018 through 2020; then, seven sites within the MCAQD network will violate the PM10 NAAQS as shown in the 3-Year Average Rate of Expected Exceedance column. Table 25. 2020 Violations of the PM10 24-Hour NAAQS Including EE Data 2018 2019 2020 24-Hour 24-Hour 24-Hour Site Expected Expected Expected Maximum Maximum Maximum Exceedances Exceedances Exceedances (µg/m3) (µg/m3) (µg/m3) Buckeye 285‡ 3 237‡ 1 165‡ 1 Central Phoenix 337‡ 4 84 0 214‡ 1 Durango Complex 282‡ 3.1 123 0 141 0 Dysart 244‡ 3 73 0 136 0 Glendale 235‡ 2 44 0 92 0 Higley 215‡ 5.1 114 0 131 0 Mesa 257‡ 2 48 0 129 0 North Phoenix 216‡ 2* 50 0 116 0 South Phoenix 171‡ 2 72 0 98 0 South Scottsdale 341‡ 4 74 0 192‡ 1 Tempe 235‡ 2 67 0 134 0 West Chandler 382‡ 7 76 0 263‡ 1.1 West 43rd 385‡ 8 235‡ 3 226‡ 3.1 West Phoenix 259‡ 4 58 0 159‡ 1 Zuni Hills 231‡ 2.2 113 0 111 0 ‡ - MCAQD flagged this exceedance as an EE in AQS †- indicates a violation of the NAAQS 3-Year Average Rate of Expected Exceedances 1.7† 1.7† 1.0 1.0 0.7 1.7† 0.7 0.7* 0.7 1.7† 0.7 2.7† 4.7† 1.7† 0.7 * - Indicates that the mean does not satisfy summary criteria, e.g., data completeness Source: EPA AQS database - 2018 - 2020 – Quicklook Criteria Parameters Report (AMP450) and AQS Preliminary Design Value Report (AMP480) Final – 2020 Air Monitoring Network Review and 2021 Plan June 23, 2020 Page 59 of 204 Figure 18 shows each site’s three-year average rate of expected exceedances for PM10. The data shown below assume that EPA R9 does not concur with any EE submission packages. Again, a site violates the NAAQS when the average is >1.0. Figure 18. 2020 PM10 24-Hour NAAQS Violations - No EE Concurrence Final – 2020 Air Monitoring Network Review and 2021 Plan June 23, 2020 Page 60 of 204 PM10 24-Hour NAAQS Violation Status - Excluding Exceptional Event Data The ADEQ submits the EE packages to EPA R9 for the 2020 PM10 exceedance days. If EPA concurs with the EE demonstration packages submitted for 2018 through 2020, then no sites will violate the PM10 NAAQS in 2020. Table 26 excludes PM10 data considered the result of an EE, regardless of the EPA’s concurrence status. The NAAQS violation status is shown in the 3-Year Average Rate of Expected Exceedance column. Table 26. 2020 Violations of the PM10 NAAQS Excluding EE Data 2018 2019 2020 24-hour 24-hour 24-hour Maximum Expected Maximum Expected Maximum Expected 3 3 3 Site (µg/m ) Exceedances (µg/m ) Exceedances (µg/m ) Exceedances Buckeye 126 0 131 0 138 0 Central Phoenix 146 0 84 0 100 0 Durango Complex 154 0 123 0 141 0 Dysart 120 0 73 0 136 0 Glendale 109 0 44 0 76 0 Higley 153 0 114 0 131 0 Mesa 154 0 48 0 129 0 North Phoenix 147 0 50 0 116 0 South Phoenix 96 0 72 0 98 0 South Scottsdale 141 0 74 0 107 0 Tempe 151 0 67 0 134 0 West Chandler 131 0 76 0 89 0 West 43rd Avenue 153 0 150 0 130 0 West Phoenix 122 0 58 0 120 0 Zuni Hills 138 0 113 0 111 0 Source: EPA AQS database – 2018 - 2020 Maximum Values Report (AMP440) Final – 2020 Air Monitoring Network Review and 2021 Plan June 23, 2020 3-Year Average Rate of Expected Exceedances 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Page 61 of 204 2020 PM2.5 Exceedance, Violation, and Exceptional Event Information This section discusses the monitoring results of the PM2.5 network in 2020. It includes NAAQS exceedance information and violation status for 2020. PM2.5 Annual NAAQS Exceedance and Violation Status The annual primary NAAQS for PM2.5 is 12.0 µg/m3 and the secondary NAAQS for PM2.5 is 15.0 µg/m3. In 2020, there were no violations of either annual NAAQS levels. Each site’s annual PM2.5 average was shown previously on Table 18. The site with the highest 3-year annual average was Durango Complex with 10.52 µg/m3. PM2.5 24-Hour NAAQS Exceedance and Violation Status The 24-hour primary and secondary NAAQS levels for PM2.5 are 35 µg/m3 . If the 24-hour block-average concentration from midnight-to-midnight at a site is 35.5 µg/m3 or higher, then it is counted as an exceedance. If the 24-hour 3-year average of the 98th percentile exceeds 35 µg/m3, then the 24-hour NAAQS is violated. In 2020, and as shown on Table 19, the site with the highest 24-hour 3-year average of the 98th percentile is West Phoenix with a concentration of 29.3 µg/m3. Therefore, no sites violate the 2012 NAAQS. Figure 19 shows the exceedance days in 2020 for PM2.5. Figure 19. 2020 PM2.5 Exceedance Days Source: MCAQD AirVision™ database PM2.5 Exceptional Events and Status of EPA Concurrence There were no PM2.5 EEs for years 2019 and 2020. EPA R9 has yet to concur or not with the 2018 EE package submittals. Even if the EPA does not concur with the EE demonstration packages for 2018, Maricopa County is in attainment for the PM2.5 2012 NAAQS. The 2019 - 2020 exceedance days did not warrant seeking EE submittal packages due to no risk of the exceedance triggering a violation of the NAAQS. Final – 2020 Air Monitoring Network Review and 2021 Plan June 23, 2020 Page 62 of 204 NETWORK MODIFICATION PROCESS This section reports on the network modifications made in the prior year as well as any future network modifications MCAQD would like to make or must make for various reasons. The final draft of the AMNRP includes these proposed changes, which is available for review and discussion during the 30-day public comment period and the open forum meeting. Most modifications will require prior approval by EPA R9. MCAQD’s AMD strives to provide the most reliable and relevant air monitoring data to the public. Air quality issues are diverse and are of great interest to the citizens of Maricopa County. High-quality data are a cornerstone of developing and implementing effective SIPs, EE packages, and permits for new and existing sources. As mentioned earlier in the PM2.5 information, in the event MCAQD needs to move or change a violating PM2.5 monitor, MCAQD would hold a public hearing regarding the requested change. Details and documentation of the requested change, as well as all public comments, would then be forwarded to the EPA R9 for approval. Any action on MCAQD’s part will be dependent on EPA R9 approval. Summary of 2020 Network Changes and Supporting Documentation Beginning January 1, 2020, MCAQD discontinued reporting air monitoring data from the Diablo site. Delta T (temperature difference) data reporting discontinued on September 1, 2020. Supporting information is provided below. These changes required approval by EPA R9 and supporting documentation can be found in Appendices IV and V. • • • • • • • • Delta T monitoring – AMD ceased monitoring for Delta T (temperature difference) at the following sites: Higley (04-013-4006), North Phoenix (04-013-1004), Tempe (04-013-4005), West 43rd (04-0134009), and West Phoenix (04-013-0019). This was due to not being able to replace the aging measurement system in-use due to not finding a comparable product on the market; and, AMD discerned that the data have not been used by customers for over fifteen years. The monitors discontinued operating on August 31, 2020. Diablo (04-013-4019) – shutdown monitoring site, which had CO, NO2, PM2.5 , and meteorological monitors on December 31, 2019. Eastwood (04-013-4021) - AMD worked with EPA R9 and ADOT to establish this new near-road site in early 2021 and to ensure compliance with the regulatory requirements for the near-road network. AMD will shift the CO and PM2.5 monitors from the Thirty-Third site to the new Eastwood site when the site becomes operational. Glendale (04-013-2001) - AMD expanded the brick wall that surrounds the shelter due to it being damaged. The change increased workspace around the shelter. Mesa (04-013-1003) - AMD improved safety at the site by installing a permanent ladder to the roof of the shelter. South Phoenix (04-013-4003) - began solar radiation monitoring on June 18, 2021. Tempe (04-013-4405) – AMD upgraded the shelter roof and added stairs for better access to the roof. Thirty-Third (04-013-4020) - AMD continued to meet near-road regulatory requirements by shifting the PM2.5 and CO monitors to this site temporarily while the Eastwood site is constructed. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 63 of 204 • • • West 43rd (04-103-4009) - AMD completed the significant upgrades that began last year to the site’s infrastructure, including the power supply, and installed the new shelter. The changes will improve safety and ease of maintenance for AMD personnel. AMD implemented the use of NumaView™ Software on the TELEDYNE API T-series gaseous analyzers; and is now graphing one-minute data from analyzer responses to concentration challenges during verifications and calibrations. AMD replaced four ESC-8832 data loggers with the AgiliareLLC/ESC-8864 data loggers at the following sites: Dysart, Fountain Hills, Pinnacle Peak, and South Phoenix. Proposed Network Modifications and Projects For 2021, MCAQD does not anticipate any significant interruptions to the monitoring operations. Currently, AMD plans on improving existing sites either by remodeling existing shelters or installing new shelters and improving site safety and security. Improvements to power supplies or communication systems will occur as needed. The following is a list of projects planned for 2021. • • • • • Cave Creek (04-013-4008) – AMD plans on establishing a shelter at this site and vacating the Maricopa County Parks and Recreation building. Eastwood (04-013-4021) – the new near-road monitoring site opened on March 5, 2021. The site monitors for CO, NO2, PM2.5, ambient temperature, barometric pressure, relative humidity, wind speed and direction. The site replaces the Diablo near-road site (04-013-4019), which permanently closed December 31, 2020. Falcon Field (04-013-1010) - a major safety issue with mounting the wind tower to the roof caused us to discontinue monitoring for wind speed and direction on March 11, 2021. The wind tower’s mounting hardware and guy wires were loose and could no longer be secured to the fire station’s roof. At this time, AMD is working to secure a better location. Thirty-Third (04-013-4020) – AMD discontinued monitoring for CO and PM2.5 at this site on February 28, 2021 due the new Eastwood site opening on March 5, 2021. At that time, this site monitors for NO2, ambient temperature, relative humidity, wind speed and direction. AMD plans to continue replacing ESC-8832 data loggers with the AgiliareLLC/ESC-8864 data loggers as funds become available. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 64 of 204 Information Regarding Maricopa County’s Supplementary Air Monitoring Programs Personnel who work in field operations go through Hazardous Waste Operations and Emergency Response Standard (HAZWOPER) training and medical monitoring requirements as per the U.S. Occupational Safety and Health Administration (OSHA) 29 CFR 1910.120. Personnel attend an annual refresher training to remain certified. Rapid Response Notification System (RRNS) Maricopa County enjoys many days with clean air; however, there are days when PM10, PM2.5, or O3 pollution levels approach or exceed the NAAQS. In particular, PM10 and PM2.5 concentrations can build up quickly due to a high wind speed or a fire, respectively. Curtailing PM pollution from natural events is challenging; it requires planning and implementing control mechanisms to reduce the likelihood of an exceedance. However, anthropogenic activities that cause high PM concentrations near a site can often be addressed. If a quickly developing PM event is not addressed, it could result in a NAAQS exceedance that may have been avoidable. To help reduce PM concentrations, MCAQD implemented an automated alarm system that triggers email notifications and/or telephone calls to subscribers when concentrations of PM10 and PM2.5 escalate. Subscribers include, but are not limited to, MCAQD’s compliance and air monitoring personnel as well as industrial source representatives who can take action to reduce PM emissions caused by their work activities. The AirVision™ database is programmed to trigger alerts for elevated PM10 five-minute and hourly concentrations. Immediately following an hourly or five-minute PM concentration surpassing an assigned notification level, a high importance alert is sent out via email, text, and/or telephone to employees, stakeholders, and/or customers. In addition, Maricopa County enforces a “no burn restriction” when a PM2.5 High Pollution Advisory (HPA) is issued by ADEQ. RRNS serves as a tool to manage high pollution events using a three-part system: 1. dissemination of as near real-time as possible air quality data to the community; 2. a notification system to alert MCAQD personnel, stakeholders, and customers of a pollution problem; and, 3. onsite response from department inspectors and stakeholders to identify and discourage pollution activity and to reduce the risk of pollution impacts. The alerts request that dust control permit holders inspect their sites as soon as possible and employ Best Available Control Measures to stabilize disturbed soils to reduce blowing dust following the notification. MCAQCED inspectors also review the data and current circumstances, make site visits, or take other appropriate actions to help stop PM concentrations from increasing. To better expedite response actions, meteorological data such as wind speed and direction are also available in five-minute increments. Ozone Precursor Study In 2021, the MCAQD will be monitoring O3 precursors through canister sampling, and in conjunction with ASU, AMD will be deploying an array of small sensors to help our understanding of spatial distribution of O3 and its precursors. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 65 of 204 Small Sensor Studies In partnership with EPA OAQPS, MCAQD launched a three-phase monitoring project to gather pollutant data using low-cost sensors. The knowledge gained from these projects will help EPA better determine how pollutant measurements from low-cost sensors compare to those of regulatory analyzers or samplers. Phase I started in late 2018 and Phase II started in 2019. Studies used low-cost small sensors to help locate spatial hotspots of pollution, identify sources, and observe pollution dynamics during the wintertime burn season. Phase I and II provide data that will help determine how well the PurpleAir® sensors measure PM pollution, as well as the effects of an arid, hot climate on the sensors’ performance and longevity. Phase I and II continued through 2021. Phase III involved testing a variety of popular, leading small sensors at the West Phoenix site and ended in 2020. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 66 of 204 Shared Air Monitoring Responsibilities For the MCAQD monitoring network, EPA requested that we work with the other S/L/T MOs within the MSA/CBSA to develop a shared monitoring agreement as specified by EPA R9. This is to ensure that each pollutant’s network is adequately represented throughout Maricopa and Pinal Counties, which is the MSA/CBSA geographical area. In 2019, we checked in with EPA R9 representatives regarding their direction on how to proceed with this requirement. We are dependent upon representatives at EPA R9 to provide the specifics needed in such an agreement before we can satisfy this requirement. As soon as we do receive guidance, we will pursue working on this effort. Information Regarding Additional Air Monitoring within Maricopa County ADEQ operates its own air monitoring surveillance system within the State of Arizona, which includes the JLG Supersite in central Phoenix. JLG Supersite is part of the national air monitoring surveillance system and numerous SLAMS monitors operate there. In addition, ADEQ collects research data for other air monitoring programs at both the JLG Supersite and MCAQD’s South Phoenix site. The research data support EPA’s several air monitoring programs that include, but are not limited to, identifying airborne air toxics and ozone precursors, identifying the chemical composition of PM2.5, and measuring visual haze. Specifically, ADEQ performs air monitoring in Maricopa County for the Chemical Speciation Network (CSN), the Interagency Monitoring of Protected Visual Environments (IMPROVE), the National Air Toxics Trends Stations (NATTS), the National Core multi-pollutant monitoring stations (NCore), the Photochemical Assessment Monitoring Stations (PAMS), and the Urban Air Toxics Monitoring Program (UATMP). They also operate visibility cameras and meteorological monitors within the County. Occasionally, ADEQ may temporarily use other sites for special projects. For more information about ADEQ’s network, consult the ADEQ Air Quality Division’s website. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 67 of 204 REFERENCES • The eCFR Title 40, Parts 50, 53, and 58 • AIRNow webpage: https://www.airnow.gov/ • U.S. EPA Office of Air and Radiation: https://www.epa.gov/aboutepa/about-office-air-andradiation-oar • U.S. EPA Criteria Pollutant Information: https://www.epa.gov/criteria-air-pollutants • U.S. EPA NAAQS Information: https://www.epa.gov/criteria-air-pollutants/naaqs-table • U.S. EPA Network Assessments/Plans webpage: https://www.epa.gov/amtic/state-monitoringagency-annual-air-monitoring-plans-and-network-assessments • U.S. EPA AQS AirData website: http://www.epa.gov/airdata • U.S. EPA NowCast Calculator webpage: https://www3.epa.gov/airnow/aqicalctest/nowcast.htm • U.S. EPA OAQPS QA Webpage: https://www.epa.gov/amtic/ambient-air-monitoring-qualityassurance • U.S. EPA Exceptional Events webpage: https://www.epa.gov/air-quality-analysis/treatment-datainfluenced-exceptional-events • U.S. EPA List of Areas Protected by the Regional Haze Program: https://www.epa.gov/visibility/list-areas-protected-regional-haze-program • U.S. EPA National Emissions Inventory database: https://www.epa.gov/air-emissionsinventories/2014-national-emissions-inventory-nei-data • EPA Metadata Specifications: https://www.epa.gov/geospatial/epa-metadata-technicalspecification • EPA Region 9 Information: http://www.epa.gov/region9/air/index.html • Arizona SIP Information: https://azdeq.gov/SIP • ADEQ Natural and Exceptional Events Information: https://azdeq.gov/naturalandexceptional_events • MCAQD Online Interactive Air Quality Map: http://alert.fcd.maricopa.gov/alert/Google/v3/airnow.html Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 68 of 204 REFERENCES cont. • MCAQD Annual Monitoring Plans and Network Assessments: http://www.maricopa.gov/1669/Air-Monitoring-Network-Plans-Assessments • MCAQD CleanAirMakeMore Restrictions Web page: https://cleanairmakemore.com/ourair/restrictions/ • MCAQD Dusts Sources, Control and Training: https://www.maricopa.gov/1913/Dust-SourcesControl-and-Training Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 69 of 204 APPENDIX I - AIR MONITORING DATA BY SITE Site information includes photographs, site type and spatial scale, and population represented. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 70 of 204 Blue Point (BP) (04-013-9702) Site Location Bush Hwy. & Usery Pass Rd., Maricopa County Spatial Scale Urban Site Type Maximum O3 Concentration Site Description: This site began operating in July 1995. This SLAMS location monitors for O3 . Meteorological monitoring includes ambient temperature and wind speed/direction. This site is located approximately 40 miles east of the Phoenix metropolitan area and represents maximum O3 concentrations downwind from an urban area. Pollutant Metric 2018 2019 2020 Maximum 8-hr O3 Average (ppm) 0.081† 0.078† 0.094†‡ O3 Number of O3 Exceedance Days 21 8 16 th 3-yr 8-hr 4 Highest O3 Average (ppm) 0.074# 0.075# 0.077# † - Indicates an exceedance of the standard ‡ - Indicates EE submission – listed value is currently the official maximum concentration in AQS # - Indicates a violation of the standard Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 O3 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 71 of 204 Buckeye (BE) (04-013-4011) Site Location AZ Hwy. 85 & MC Hwy. 85, Buckeye Spatial Scale Neighborhood for CO, and PM10 Urban for NO2 and O3 Site Type Population Exposure and Upwind Background for O3 Site Description: The Buckeye site began operating in August 2004. This SLAMS location monitors for CO, NO2, O3 , and PM10. Meteorological monitoring includes ambient temperature, barometric pressure, relative humidity, and wind speed/direction. The site is located at the Maricopa County Department of Transportation - Southwest Facility. The immediate area is agriculture and encroaching residential development. This site was closed temporarily in early 2017 for significant building and infrastructure upgrades. Pollutant Metric 2018 2019 2020 Maximum 8-hr CO Average (ppm) 0.6 0.8 0.7 CO Number of 8-hr CO Exceedances 0 0 0 Annual NO2 Average (ppb) 7.67 7.09 8.12 NO2 th NO2 1-hr Avg. 98 Percentile (ppb) 34.0 33.0 36.0 Maximum 8-hr O3 Average (ppm) 0.072† 0.079† 0.084†‡ O3 Number of O3 Exceedance Days 1 1 2 th 3-yr 8-hr 4 Highest O3 Average (ppm) 0.066 0.067 0.066 3 Maximum 24-hr PM10 Average (µg/m ) 285†‡ 237†‡ 165†‡ PM10 Number of 24-hr PM10 Exceedance Days 3 1 1 3 Annual PM10 Average (µg/m ) 42.9 35.4 45.8 † - Indicates an exceedance of the standard ‡ - Indicates EE submission – listed value is currently the official maximum concentration in AQS Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 O3 and PM10 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 72 of 204 Cave Creek (CC) (04-013-4008) Site Location 32nd St. & Carefree Hwy., Cave Creek Spatial Scale Urban Site Type Maximum O3 Concentration Site Description: The Cave Creek site began operating in July 2001. This SLAMS location monitors for O3. Meteorological monitoring includes ambient temperature, barometric pressure, rain, relative humidity, and wind speed/direction. The site is located at the Maricopa County Cave Creek Recreation Area - Park Office. Pollutant Metric 2018 2019 2020 Maximum 8-hr O3 Average (ppm) 0.079† 0.073† 0.086†‡ O3 Number of O3 Exceedance Days 11 3 14 th 3-yr 8-hr 4 Highest O3 Average (ppm) 0.072# 0.071# 0.074# † - Indicates an exceedance of the standard ‡ - Indicates EE submission – listed value is currently the official maximum concentration in AQS # - Indicates a violation of the standard Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 O3 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 73 of 204 Central Phoenix (CP) (04-013-3002) Site Location 19th St. & Roosevelt St., Phoenix Spatial Scale Neighborhood Site Type Population Exposure for CO, O3, and PM10 Highest Concentration for NO2 and SO2 Site Description: The Central Phoenix site began operating in June 1962. This SLAMS location monitors for CO, PM10, NO2 , O3, and SO2 . Meteorological monitoring includes ambient temperature, barometric pressure, and wind speed/direction. Pollutant Metric 2018 2019 2020 Maximum 8-hr CO Average (ppm) 2.4 1.8 1.9 CO Number of 8-hr CO Exceedances 0 0 0 Annual NO2 Average (ppb) 17.53 15.71 15.93 NO2 th NO2 1-hour Average 98 Percentile (ppb) 56.0 52.0 54.0 Maximum 8-hr O3 Average (ppm) 0.079† 0.077† 0.073†‡ O3 Number of O3 Exceedance Days 5 6 7 3-yr 8-hr 4th Highest O3 Average (ppm) 0.072# 0.073# 0.072# 3 Maximum 24-hr PM10 Average (µg/m ) 337†‡ 84 214†‡ PM10 Number of 24-hr PM10 Exceedance Days 4 0 1 3 Annual PM10 Average (µg/m ) 39.2 30.4 37.4 th SO2 1-hour 99 Percentile (ppb) 8.0 5.0 5.0 SO2 Number of SO2 Exceedance Days 0 0 0 Annual SO 2 Avg. (ppb) 1.07 0.45 0.25 † - Indicates an exceedance of the standard ‡ - Indicates EE submission – listed value is currently the official maximum concentration in AQS # - Indicates a violation of the standard Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP4500) MCAQD 2018 - 2020 O3 and PM10 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 74 of 204 Diablo (DI) (04-013-4019) Site Location Fairmont Dr. & Diablo Way, Tempe Spatial Scale Micro Site Type SourceOriented Site Description: The Diablo site began operating in February 2014. This SLAMS location monitored for CO, NO 2, and PM2.5. Meteorological monitoring included ambient temperature, relative humidity, and wind speed/direction. Diablo was the first near-road air monitoring site established by MCAQD. The Diablo site closed on December 31, 2019 due to ADOT making significant design improvements to the I-10 and Broadway Curve area. In 2020, near-road monitoring of CO and PM2.5 temporarily shifted to the Thirty-Third near-road site to remain compliant with EPA requirements. The replacement site will be in the same general area as Diablo and is slated to open in early 2021. At that time, CO and PM2.5 monitoring will shift to the new site. Pollutant Metric 2018 2019 2020 Maximum 8-hr CO Average (ppm) 1.6 1.5 not CO operating Number of 8-hr CO Exceedance Days 0 0 Annual NO2 Average (ppb) 18.93 16.83 not NO2 th operating NO2 1-hr Average 98 Percentile (ppb) 56.0 50.0 3 Maximum 24-hr PM2.5 Average (µg/m ) 49.0†‡ 18.4 Number of 24-hr PM2.5 Exceedance Days 2 0 not PM2.5 3 operating Annual PM2.5 Average (µg/m ) 8.62 6.88 PM2.5 98th Percentile Value (µg/m3) 21.9 13.7 † - Indicates an exceedance of the standard ‡ - Indicates EE submission – listed value is currently the official maximum concentration in AQS Source: EPA AQS database - 2018 - 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 PM2.5 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 75 of 204 Durango Complex (DC) (04-013-9812) Site Location 27th Ave & Durango St., Phoenix Spatial Scale Neighborhood Site Type Highest Concentration Site Description: This site began operating in January 1999. This SLAMS location monitors for PM10, PM2.5, and SO2. Meteorological monitoring includes ambient temperature, barometric pressure, relative humidity, and wind speed/direction. The site is located inside the Maricopa County Flood Control District storage yard. Pollutant Metric 2018 2019 3 Maximum 24-hr PM10 Average (µg/m ) 282†‡ 123 PM10 Number of 24-hr PM10 Exceedance Days 3 0 3 Annual PM10 Average (µg/m ) 43.1 31.5 Maximum 24-hr PM2.5 Average (µg/m3) 115.3†‡ 27.8 Number of PM2.5 24-hr Exceedance Days 1 0 PM2.5 3 Annual PM2.5 Average (µg/m ) 10.10 8.38 th 3 98 Percentile PM2.5 Value (µg/m ) 25.7 21.7 th SO2 1-hour 99 Percentile (ppb) 8.0 5.0 SO2 Number of SO2 Exceedance Days 0 0 Annual SO 2 Average (ppb) 0.77 0.91 † - Indicates an exceedance of the standard ‡ - Indicates EE submission – listed value is currently the official maximum concentration in AQS Source: EPA AQS database - 2018 - 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 PM2.5 and PM10 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 2020 141 0 39.3 76.3† 2 10.52 28.8 7.0 0 0.59 Page 76 of 204 Dysart (DY) (04-013-4010) Site Bell Rd. & Location Dysart Rd., Surprise Spatial Scale Neighborhood Site Type Population Exposure Site Description: The Dysart site began operating in July 2003. This SLAMS location monitors for O3 and PM10. Meteorological monitoring includes ambient temperature, barometric pressure, relative humidity, and wind speed/direction. The site is located at the Maricopa County Facility Maintenance Yard on the corner of Bell Rd. and Dysart Rd. The site is in a growing population area in the northwest valley and is surrounded by a variety of land use. Pollutant Metric 2018 2019 2020 Maximum 8-hr O3 Average (ppm) 0.086† 0.074† 0.091†‡ O3 Number of O3 Exceedance Days 9 1 15 th 3-yr 8-hr 4 Highest O3 Average (ppm) 0.072# 0.073# 0.074# 3 Maximum 24-hr PM10 Average (µg/m ) 244†‡ 73 136 PM10 Number of 24-hr PM10 Exceedance Days 3 0 0 3 Annual PM10 Average (µg/m ) 30.4 23.0 28.0 † - Indicates an exceedance of the standard ‡ - Indicates EE submission – listed value is currently the official maximum concentration in AQS # - Indicates a violation of the standard Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 O3 and PM10 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 77 of 204 Falcon Field (FF) (04-013-1010) Site Location Greenfield Rd. & McKellips Rd., Mesa Spatial Scale Neighborhood Site Type Population Exposure Site Description: This site began operating in June 1989. This SLAMS location monitors for O3. Meteorological monitoring includes ambient temperature and relative humidity. The site is located at a fire station near an airfield within a growing residential area. In 2020, wind speed and direction monitoring ceased at this location due to no longer being able to secure a wind tower to the roof of the fire station. The search for a new location in the same general area where an air monitoring shelter can be installed is underway. Pollutant Metric 2018 2019 2020 Maximum 8-hr O3 Average (ppm) 0.082† 0.079† 0.089†‡ O3 Number of O3 Exceedance Days 22 13 20 th 3-yr 8-hr 4 Highest O3 Average (ppm) 0.075# 0.076# 0.078# † - Indicates an exceedance of the standard ‡ - Indicates EE submission – listed value is currently the official maximum concentration in AQS # - Indicates a violation of the standard Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 O3 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 78 of 204 Fountain Hills (FH) (04-013-9704) Site Location Fountain Hills Blvd. & Palisades Blvd., Fountain Hills Spatial Scale Neighborhood Site Type Maximum O3 Concentration Site Description: The site began operating in April 1996 at a Fountain Hills fire station. This SLAMS location monitors for O 3 only. Meteorological monitoring includes ambient temperature, barometric pressure, relative humidity, and wind speed/direction. The site is located approximately 15 miles northeast of the Phoenix metropolitan area and represents maximum O3 concentrations downwind from an urban area. Furthermore, the site sits on the fringes of the central basin district along the predominant summer/fall daytime wind direction. Pollutant Metric 2018 2019 2020 Maximum 8-hr O3 Average (ppm) 0.084† 0.072† 0.092†‡ O3 Number of O3 Exceedance Days 14 1 8 th 3-yr 8-hr 4 Highest O3 Average (ppm) 0.072# 0.072# 0.074# † - Indicates an exceedance of the standard ‡ - Indicates EE submission – listed value is currently the official maximum concentration in AQS # - Indicates a violation of the standard Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 O3 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 79 of 204 Glendale (GL) (04-013-2001) Site Location 59th Ave. & Olive Ave., Glendale Spatial Scale Neighborhood Site Type Population Exposure Site Description: The site began operating in January 1974. This SLAMS location monitors for O3, PM10, and PM2.5. Meteorological monitoring includes ambient temperature, barometric pressure, relative humidity, and wind speed/direction. The site is located on the grounds of Glendale Community College near homes, various strip malls, food establishments, and parks. Pollutant Metric 2018 2019 2020 Maximum 8-hr O3 Average (ppm) 0.77† 0.074† 0.086†‡ O3 Number of O3 Exceedance Days 3 2 5 th 3-yr 8-hr 4 Highest O3 Average (ppm) 0.069 0.069 0.071# Maximum 24-hr PM10 Average (µg/m3) 235†‡ 44 76 PM10 Number of 24-hr PM10 Exceedance Days 2 0 0 3 Annual PM10 Average (µg/m ) 23.6 17.3 20.1 3 Maximum 24-hr PM2.5 Average (µg/m ) 53.2†‡ 25.9 64.9† Number of 24-hr PM2.5 Exceedance Days 1 0 1 PM2.5 3 Annual PM2.5 Average (µg/m ) 7.33 6.34 7.63 PM2.5 98th Percentile Value (µg/m3) 19.5 15.1 19.0 † - Indicates an exceedance of the standard ‡ - Indicates EE submission – listed value is currently the official maximum concentration in AQS # - Indicates a violation of the standard Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 O3, PM2.5, and PM10 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 80 of 204 Higley (HI) (04-013-4006) Site Location Spatial Scale Site Type Higley Rd. & Williams Field Rd., Gilbert Neighborhood Population Exposure Site Description: Originally, ADEQ began monitoring at this site in 1994 to measure background particulate concentrations near the urban limits of Maricopa County. The MCAQD assumed operating this site in July 2000. This SLAMS location monitors for PM10. Meteorological monitoring includes ambient temperature, barometric pressure, and wind speed/direction. The site is located in a suburban area near homes, strip malls, and schools with limited agricultural operations nearby. Pollutant PM10 Metric Maximum 24-hr PM10 Average (µg/m3) Number of 24-hr PM10 Exceedance Days 2018 215†‡ 5 2019 91 0 2020 131 0 Annual PM10 Average (µg/m3) 38.1 30.1 39.2 † - Indicates an exceedance of the standard ‡ - Indicates EE submission – listed value is currently the official maximum concentration in AQS Source: EPA AQS database - 2018 - 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 PM10 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 81 of 204 Humboldt Mountain (HM) (04-013-9508) Site Location Humboldt Mtn. Summit Spatial Scale Regional Site Type Maximum O3 Concentration Site Description: This site began operating in August 1995. This SLAMS location monitors for O3. Meteorological monitoring includes ambient temperature and relative humidity. The site is located on Federal Aviation Agency (FAA) property within the Tonto National Forest. In 2019, the long-anticipated move of the station into a new facility occurred. The new station is about 15 meters away from the National Forest Service building that once housed it. This site is located approximately 40 miles NE of the Phoenix metropolitan area at an elevation of 5190 feet and represents extreme downwind O3 concentrations. Pollutant Metric 2018 2019 2020 Maximum 8-hr O3 Average (ppm) 0.081† 0.081† 0.078†‡ O3 Number of O3 Exceedance Days 12 7 6 th 3-yr 8-hr 4 Highest O3 Average (ppm) 0.073# 0.074# 0.073# † - Indicates an exceedance of the standard ‡ - Indicates EE submission – listed value is currently the official maximum concentration in AQS # - Indicates a violation of the standard Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 O3 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 82 of 204 Mesa (ME) (04-013-1003) Site Location Broadway Rd. & Brooks Ave., Mesa Spatial Scale Neighborhood Site Type Population Exposure Site Description: This site began operating in January 1978. This SLAMS location monitors for CO, O3 , PM10, and PM2.5. Meteorological monitoring includes ambient temperature, barometric pressure, relative humidity, and wind speed/direction. The site is located at Mesa Brooks Reservoir, which is an area that contains residential, commercial, and industrial properties. Pollutant Metric 2018 2019 2020 Maximum 8-hr CO Avg. (ppm) 1.4 1.0 1.6 CO Number of 8-hr CO Exceedance Days 0 0 0 Maximum 8-hr O3 Average (ppm) 0.082† 0.084† 0.093†‡ O3 Number of O3 Exceedance Days 23 13 15 th 3-yr 8-hr 4 Highest O3 Average (ppm) 0.076# 0.077# 0.078# 3 Maximum 24-hr PM10 Average (µg/m ) 257†‡ 48 129 PM10 Number of 24-hr PM10 Exceedance Days 2 0 0 3 Annual PM10 Average (µg/m ) 24.3 15.0 21.5 3 Maximum 24-hr PM2.5 Avg. (µg/m ) 41.1†‡ 16.6 20.6 Number of 24-hr PM2.5 Exceedance Days 3 0 0 PM2.5 3 Annual PM2.5 Average (µg/m ) 7.42 5.20 7.30 PM2.5 98th Percentile Value (µg/m3) 19.1 11.1 17.4 † - Indicates an exceedance of the standard ‡ - Indicates EE submission – listed value is currently the official maximum concentration in AQS # - Indicates a violation of the standard Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 O3, PM2.5, and PM10 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 83 of 204 North Phoenix (NP) (04-013-1004) Site Location 7th St. & Butler Ave., Phoenix Spatial Scale Neighborhood Site Type Population Exposure for PM10 & PM2.5; Max Concentration for O3 Site Description: This site began operating in January 1975. This SLAMS location monitors for O3, and PM10, PM2.5. Meteorological monitoring includes ambient temperature, barometric pressure, and wind speed/direction. The site is located in a park that in an area that contains residential and commercial properties. Pollutant Metric 2018 2019 2020 Maximum 8-hr O3 Average (ppm) 0.085† 0.081† 0.094†‡ O3 Number of O3 Exceedance Days 14 13 15 th 3-yr 8-hr 4 Highest O3 Average (ppm) 0.076# 0.075# 0.078# 3 Maximum 24-hr PM10 Average (µg/m ) 216†‡ 50 116 PM10 Number of 24-hr PM10 Exceedance Days 2 0 0 3 Annual PM10 Avg. (µg/m ) 22.1* 16.8 20.5 3 Maximum 24-hr PM2.5 Average (µg/m ) 45.2†‡ 19.1 51.4† Number of 24-hr PM2.5 Exceedance Days 2 0 1 PM2.5 3 Annual PM2.5 Average (µg/m ) 7.35* 6.31 7.88 th 3 PM2.5 98 Percentile Value (µg/m ) 18.7 14.5 18.4 † - Indicates an exceedance of the standard ‡ - Indicates EE submission – listed value is currently the official maximum concentration in AQS # - Indicates a violation of the standard * - Indicates that the mean does not satisfy summary criteria, e.g., data completeness Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 O3, PM2.5, and PM10 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 84 of 204 Pinnacle Peak (PP) (04-013-2005) Site Location Alma School & Happy Valley Rd., Scottsdale Spatial Scale Urban Site Type Maximum O3 Concentration Site Description: This site began operating in February 1988. This SLAMS location monitors for O3 only. Meteorological monitoring includes ambient temperature, barometric pressure, relative humidity, and wind speed/direction. The site is located approximately 25 miles NE of the Phoenix metropolitan area and represents maximum O3 concentrations downwind from an urban area. This site measures O3 concentrations related to the transport of O3 from central metropolitan Phoenix. Pollutant Metric 2018 2019 2020 Maximum 8-hr O3 Average (ppm) 0.090† 0.080† 0.094†‡ O3 Number of O3 Exceedance Days 27 17 13 th 3-yr 8-hr 4 Highest O3 Average (ppm) 0.077# 0.077# 0.079# † - Indicates an exceedance of the standard ‡ - Indicates EE submission – listed value is currently the official maximum concentration in AQS # - Indicates a violation of the standard Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 O3 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 85 of 204 South Phoenix (SP) (04-013-4003) Site Location Central Ave. & Broadway Rd., Phoenix Spatial Scale Neighborhood Site Type Population Exposure Site Description: The site began operating in October 1999. This SLAMS location monitors for CO, O3, PM10, and PM2.5. Meteorological monitoring includes ambient temperature, barometric pressure, relative humidity, and wind speed/direction. The site borders a mixture of high population density residential and commercial properties. Pollutant Metric 2018 2019 2020 Maximum 8-hr CO Average (ppm) 3.2 1.6 2.2 CO Number of 8-hr CO Exceedance Days 0 0 0 Maximum 8-hr O3 Average (ppm) 0.078† 0.078† 0.086†‡ O3 Number of O3 Exceedance Days 6 5 5 th 3-yr 8-hr 4 Highest O3 Average (ppm) 0.070 0.072# 0.073# 3 Maximum 24-hr PM10 Average (µg/m ) 171†‡ 72 98 PM10 Number of 24-hr PM10 Exceedance Days 2 0 0 Annual PM10 Average (µg/m3) 33.9 23.8 34.2 3 Maximum 24-hr PM2.5 Average (µg/m ) 134.1†‡ 48.4† 64.7† Number of 24-hr PM2.5 Exceedance Days 4 1 7 PM2.5 3 Annual PM2.5 Average (µg/m ) 9.37 7.48 10.45 th 3 PM2.5 98 Percentile value (µg/m ) 27.8 21.4 34.1 † - Indicates an exceedance of the standard ‡ - Indicates EE submission – listed value is currently the official maximum concentration in AQS # - Indicates a violation of the standard Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 O3, PM2.5, and PM10 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 86 of 204 South Scottsdale (SS) (04-013-3003) Site Location Thomas Rd. & Miller Rd., Scottsdale Spatial Scale Neighborhood Site Type Population Exposure Site Description: This site began operating in January 1974. This SLAMS location monitors for O3 and PM10. Meteorological monitoring includes ambient temperature, barometric pressure, relative humidity, and wind speed/direction. The stations are located in a residential area. Pollutant Metric 2018 2019 2020 Maximum 8-hr O3 Average (ppm) 0.072† 0.071† 0.102†‡ O3 Number of O3 Exceedance Days 3 1 18 3-yr 8-hr 4th Highest O3 Average (ppm) 0.070 0.069 0.074# 3 Maximum 24-hr PM10 Average (µg/m ) 341†‡ 74 192†‡ PM10 Number of 24-hr PM10 Exceedance Days 4 0 1 3 Annual PM10 Average (µg/m ) 31.2 21.4 28.3 † - Indicates an exceedance of the standard ‡ - Indicates EEs submission – listed value is currently the official maximum concentration in AQS # - Indicates a violation of the standard Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 O3 and PM10 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 87 of 204 Tempe (TE) (04-013-4005) Site Location Apache Blvd. & College Ave., Tempe Spatial Scale Neighborhood Site Type Population Exposure Site Description: This site began operating in 2000. This SLAMS location monitors for O3 , PM10, and PM2.5. Meteorological monitoring includes ambient temperature, rain, and wind speed/direction. The station is near the ASU Tempe Campus and surrounded by residential homes, high-density residential properties, and a railroad track. Pollutant Metric 2018 2019 2020 Maximum 8-hr O3 Average (ppm) 0.071† 0.069 0.080†‡ O3 Number of O3 Exceedance Days 2 0 11 th 3-yr 8-hr 4 Highest O3 Average (ppm) 0.067 0.066 0.069 3 Maximum 24-hr PM10 Average (µg/m ) 235†‡ 67 134 PM10 Number of 24-hr PM10 Exceedance Days 2 0 0 3 Annual PM10 Average (µg/m ) 26.8 17.8 22.4 3 Maximum 24-hr PM2.5 Average (µg/m ) 38.2†‡ 14.7 19.4 Number of 24-hr PM2.5 Exceedance Days 1 0 0 PM2.5 3 Annual PM2.5 Average (µg/m ) 7.11 5.79 6.78 PM2.5 98th Percentile Value (µg/m3) 16.3 11.9 15.6 † - Indicates an exceedance of the standard ‡ - Indicates EE submission – listed value is currently the official maximum concentration in AQS Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 O3, PM2.5, and PM10 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 88 of 204 Thirty-Third (TT) (04-013-4020) Site Location Interstate-10 & 33rd Ave., Phoenix Spatial Scale Micro Site Type Source-Oriented Site Description: This site began operating in September 2015. This SLAMS location monitors for NO2; and temporarily for CO and PM2.5 beginning January 2020. This change was needed to remain compliant with EPA requirements in lieu of the Diablo site closing. The near-road site replacing Diablo is slated to open in early 2021, and CO and PM2.5 monitoring will then shift to the new near-road site. Meteorological monitoring includes ambient temperature, barometric pressure, relative humidity, and wind speed/direction. The site is one of two near-road air monitoring sites and is located on the south side embankment adjacent to the I-10 and oriented on an east-west section of the highway, midway downslope from 33rd Avenue toward the I-10. Pollutant Metric 2018 2019 Maximum 8-hr CO Average (ppm) CO not operating Number of 8-hr CO Exceedance Days Annual NO2 Average (ppb) 28.25 24.84 NO2 th NO2 1-hr 98 Percentile Average (ppb) 62.0 58.0 Maximum 24-hr PM2.5 Average (µg/m3) Number of 24-hr PM2.5 Exceedance Days PM2.5 not operating Annual PM2.5 Average (µg/m3) PM2.5 98th Percentile Value (µg/m3) † - Indicates an exceedance of the standard * - Indicates that the mean does not satisfy summary criteria, e.g., data completeness Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 O3 and PM2.5 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 2020 2.9 0 25.11 57.0 141.4† 9 13.18* 36.7 Page 89 of 204 West Chandler (WC) (04-013-4004) Site Location Frye Rd. & Ellis St., Chandler Spatial Scale Neighborhood Site Type Population Exposure Site Description: This site began operating in January 1995, This SLAMS location monitors for CO, O 3, and PM10. Meteorological monitoring includes ambient temperature, barometric pressure, relative humidity, and wind speed/direction. The site is surrounded by residential, agricultural, and heavy industrial operations, such as semiconductor manufacturing plants and liquid air storage. The PM10 monitor’s scale of representativeness was first established as middle scale, but it was changed to neighborhood in June 2018 to better reflect land use currently surrounding the site and to match general monitoring requirements found in 40 CFR Part 58 Appendix D, Table D-1. Pollutant Metric 2018 2019 2020 Maximum 8-hr CO Average (ppm) 1.7 1.0 1.3 CO Number of 8-hr CO Exceedance Days 0 0 0 Maximum 8-hr O3 Average (ppm) 0.075† 0.082† 0.081†‡ O3 Number of O3 Exceedance Days 2 6 5 th 3-yr 8-hr 4 Highest O3 Average (ppm) 0.070 0.072# 0.072# 3 Maximum 24-hr PM10 Average (µg/m ) 382†‡ 67 263 PM10 Number of 24-hr PM10 Exceedance Days 7 0 1 3 Annual PM10 Average (µg/m ) 35.1 24.3 30.7 † - Indicates an exceedance of the standard ‡ - Indicates EE submission – listed value is currently the official maximum concentration in AQS # - Indicates a violation of the standard Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 O3 and PM10 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 90 of 204 West 43rd Avenue (WF) (04-013-4009) Site Location 43rd Ave. & Broadway Rd., Phoenix Spatial Scale Middle Site Type Highest Concentration Site Description: This site began operating in April 2002. This SLAMS location monitors for PM10. Meteorological monitoring includes ambient temperature, barometric pressure, and wind speed/direction. The site is located near a combination of heavy industrial operations and residential homes to measure maximum PM10 concentrations. The sources around the site include sand and gravel operations, automobile and metal recycling facilities, landfills, paved and unpaved haul roads, and cement casting. Pollutant Metric 2018 2019 2020 Maximum 24-hr PM10 Avg. (µg/m3) 385†‡ 235†‡ 226 PM10 Number of 24-hr PM10 Exceedance Days 8 3 3 3 Annual PM10 Avg. (µg/m ) 60.4 50.8 58.2 † - Indicates an exceedance of the standard ‡ - Indicates EE submission – listed value is currently the official maximum concentration in AQS Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 PM10 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 91 of 204 West Phoenix (WP) (04-013-0019) Site Location 39th Ave. & Earll Dr., Phoenix Spatial Scale Neighborhood Site Type Population Exposure for CO, NO2, O3 , PM10, and Highest Concentration for PM2.5 Site Description: This site began operating in January 1984. This SLAMS location monitors for CO, NO2, O3, PM10, and PM2.5. Meteorological monitoring includes ambient temperature, barometric pressure, and wind speed/direction. The site is located in an area of stable, high-density, residential properties. This is the QA collocation site for PM2.5 where one filter-based PM2.5 FRM sampler operates alongside a continuous PM2.5 FEM analyzer as per 40 CFR Part 58 Appendix A. Pollutant Metric 2018 2019 2020 Maximum 8-hr CO Average (ppm) 4.4 2.4 3.0 CO Number of 8-hr CO Exceedance Days 0 0 0 Annual NO2 Average (ppb) 16.12 14.07 13.36 NO2 NO2 1-hr Average 98th Percentile (ppb) 52.0 47.0 48.0 Maximum 8-hr O3 Average (ppm) 0.086† 0.078† 0.091†‡ O3 Number of O3 Exceedance Days 6 3 10 3-yr 8-hr 4th Highest O3 Average (ppm) 0.074# 0.073# 0.074# Maximum 24-hr PM10 Average (µg/m3) 259†‡ 58 159† PM10 Number of 24-hr PM10 Exceedance Days 4 0 1 3 Annual PM10 Average (µg/m ) 33.3 23.0 30.8 Maximum 24-hr PM2.5 Average (µg/m3) 199.3†‡ 40.4† 149.1† Number of 24-hr PM2.5 Exceedance Days 3 1 7 PM2.5 3 Annual PM2.5 Average (µg/m ) 9.92 8.17 10.47 PM2.5 98th Percentile Value 30.6 23.4 33.9 † - Indicates an exceedance of the standard ‡ - Indicates EE submission – listed value is currently the official maximum concentration in AQS # - Indicates a violation of the standard Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 O3, PM2.5, and PM10 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 92 of 204 Zuni Hills (ZH) (04-013-4016) Site Location 109th Ave. & Deer Valley Rd., Phoenix Spatial Scale Neighborhood Site Type Population Exposure Site Description: This site began operating in December 2009. This SLAMS location monitors for PM10. Meteorological monitoring includes ambient temperature and wind speed/direction. The station is located on the campus of the Zuni Hills Elementary School. Pollutant Metric 2018 2019 2020 3 Maximum 24-hr PM10 Average (µg/m ) 231†‡ 113 111 PM10 Number of 24-hr PM10 Exceedance Days 2 0 0 3 Annual PM10 Average (µg/m ) 27.7 20.6 25.4 † - Indicates an exceedance of the standard ‡ - Indicates EE submission – listed value is currently the official maximum concentration in AQS Source: EPA AQS database - 2018 – 2020 Quicklook Criteria Report (AMP450) MCAQD 2018 - 2020 PM10 Exceedance Day Reports for Numbers Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 93 of 204 APPENDIX II - EPA-REQUIRED SITE METADATA This appendix provides site and monitor metadata required by 40 CFR §58.10 and Appendices A, B, C, D, and E, as applicable. Information includes, but is not limited to, quality assurance metrics, site identification and type, each monitor’s type and scale of representativeness as well as basic monitoring objective, collection frequency of air samples, i.e., operating schedule, and any proposals to change a monitoring station within the next 18 months. (See Appendix VII for the Glossary) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 94 of 204 BLUE POINT County Abbreviation: BP AQS ID: 04-013-9702 Address: Bush Highway & Usery Pass Rd., Maricopa County Lat/Long Coordinates: 33.54558 N, -111.60972 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information Pollutant O3 Parameter Code 44201 Parameter Occurrence Code 1 Collection Frequency Continuous Analysis Method (filter samples only) Not Applicable Any Proposal to Remove or Move Monitor? No Does monitor operation meet 40 CFR Part 58, Subpart G – Appendices A, C, D, and E? Yes Is site suitable for comparison to the annual PM2.5 NAAQS as per §58.30? Not Applicable Are Data Comparable to Respective NAAQS? Yes Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) Checks Performed in 2020 (Gases) 26 Frequency of 1-Point QC (Precision) Checks Bi-Weekly Number of Flow Rate Verifications Performed in 2020 (PM) Not Applicable Frequency of Flow Rate Verifications Number of PE Audits Performed in 2020 2 05/13/20 Dates of PE Audits 11/13/21 Annual Precision & PE Audit Reports Submitted to AQS? Yes Date of Annual Data Certification Submission 04/30/21 Appendix B Requirements - PSD Monitoring - Not Applicable Appendix C Requirements - Monitoring Methodology Date Sampling Started Monitor Type Monitor Make - Model Final – 2020 Air Monitoring Network Review and 2021 Plan June 23, 2020 01/01/1993 SLAMS Teledyne API – Model 400T Page 95 of 204 BLUE POINT Method Code 087 Method Type (FRM, FEM, ARM) FEM Appendix D Requirements - Network Design Criteria Site Type Max Ozone Concentration Basic Monitoring Objective NAAQS Comparison Monitoring Scale (Spatial Scale Represented) Urban Monitoring Season Jan-Dec Network Meets Minimum Number of Monitors Required? Yes Appendix E Requirements - Probe and Monitoring Path Siting Criteria Distance between collocated samplers Not Applicable Probe Height (distance above ground level to inlet) 4.4 meters Airflow Arc (degrees around probe/inlet) 360º Probe/Sample Line Material (Gases) FEP Pollutant Sample Residence Time (Gases) 8.48 seconds Distance from Supporting Structure/Roof (horizontal distance and vertical distance to Horizontal 0 meters probe/inlet) Vertical 2 meters Distance from Obstructions on Roof (horizontal distance to obstruction and vertical Horizontal no obstruction height of obstruction above probe/inlet) Vertical no obstruction Horizontal no obstruction Distance from Obstructions Not on Roof (horizontal distance to the obstruction and vertical height of obstruction above probe/inlet) Vertical 11 meters Distance from Dripline of Closest Tree(s) 11 meters Distance to Furnace or Flue No Furnace or Flue Nearest Major Roadway Bush Highway Distance and Direction to Road 160 meters, S Average Daily Traffic Count 1,000 Groundcover Pavement Sources: For QC, flow rate, and collocation assessment information - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audit dates - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 96 of 204 BUCKEYE County ID: BE AQS ID: 04-013-4011 Address 26453 W MC85 Coordinates: 33.36985 N, -112.62068 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information Pollutant CO NO2 O3 Parameter Code 42101 42602 44201 Parameter Occurrence Code 1 1 1 Collection Frequency Continuous Continuous Continuous Analysis Method (filter samples only) Not Applicable Not Applicable Not Applicable Any Proposal to Remove or Move Monitor? No No No Does monitor operation meet 40 CFR Part 58, Subpart G – Yes Yes Yes Appendices A, C, D, and E? Is site suitable for comparison to the annual PM2.5 NAAQS as Not Applicable Not Applicable Not Applicable per §58.30? Are Data Comparable to Respective NAAQS? Yes Yes Yes Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) Checks Performed in 2020 26 25 26 (Gases) Frequency of 1-Point QC (Precision) Checks Number of Flow Rate Verifications Performed in 2020 (PM) Frequency of Flow Rate Verifications Number of PE Audits Performed in 2020 Dates of PE Audits Yes Not Applicable Yes Not Applicable Bi-Weekly Bi-Weekly Bi-Weekly Not Applicable Not Applicable Not Applicable 2 2 2 01/14/20 8/11/20 01/14/20 08/24/20 06/15/20 12/14/20 01/14/20 04/07/20 07/28/20 10/12/20 Yes 04/30/21 Yes 04/30/21 Annual Precision & PE Audit Reports Submitted to AQS? Yes Yes 04/30/21 04/30/21 Date of Annual Data Certification Submission Appendix B Requirements - PSD Monitoring - Not Applicable Final – 2020 Air Monitoring Network and 2021 Plan PM10 81102 1 Continuous Not Applicable No June 23, 2021 Page 97 of 204 26 Bi-Weekly 4 BUCKEYE Appendix C Requirements - Monitoring Methodology Date Sampling Started 08/01/2004 08/01/2004 08/01/2004 Monitor Type SLAMS SLAMS SLAMS Teledyne API – Teledyne API – Teledyne API – Model Monitor Make - Model Model 300T Model 200T 400T Method Code 093 099 087 PM Monitor Flow Type Not Applicable Not Applicable Not Applicable PM Monitor Collection Type Not Applicable Not Applicable Not Applicable Method Type (FRM, FEM, ARM) FRM FRM FEM Appendix D Requirements - Network Design Criteria Site Type Population Exposure Population Exposure Upwind Background Basic Monitoring Objective Monitoring Scale (Spatial Scale Represented) Monitoring Season Neighborhood Urban Urban Neighborhood Sep-Mar Jan-Dec Jan-Dec Jan-Dec Yes Yes Yes Yes Appendix E Requirements - Probe and Monitoring Path Siting Criteria Distance between collocated samplers Not Applicable Not Applicable Not Applicable Probe Height (distance above ground level to inlet) 4 meters 4 meters 4 meters Probe Sample Line Material FEP FEP FEP Pollutant Sample Residence Time 9.81 seconds 9.81 seconds 9.81 seconds Airflow Arc 360º 360º 360º Distance from Obstructions on Roof (horizontal distance to obstruction and vertical height of obstruction above probe/inlet) Population Exposure NAAQS Comparison NAAQS Comparison NAAQS Comparison NAAQS Comparison Network Meets Minimum Number of Monitors Required? Distance from Supporting Structure/Roof (horizontal distance and vertical distance to probe/inlet) 08/01/2004 SLAMS Thermo – TEOM 1405-S 079 Low Volume Size Specific FEM Not Applicable 4 meters Not Applicable Not Applicable 360º Horizontal 0 meters 0 meters 0 meters 0 meters Vertical 4.4 meters 4.4 meters 4.4 meters 4.4 meters Horizontal no obstruction no obstruction no obstruction no obstruction Vertical no obstruction no obstruction no obstruction no obstruction Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 98 of 204 BUCKEYE Distance from Obstructions Not on Roof Horizontal no obstruction no obstruction no obstruction (horizontal distance to the obstruction and vertical height of obstruction above Vertical no obstruction no obstruction no obstruction probe/inlet) Distance from Dripline of Closest Tree(s) 7.6 meters 7.6 meters 7.6 meters Distance to Furnace or Flue No Furnace or Flue No Furnace or Flue No Furnace or Flue Nearest Major Roadway U.S. Hwy 85 U.S. Hwy 85 U.S. Hwy 85 Distance and Direction to Road 31 meters, N 31 meters, N 31 meters, N Average Daily Traffic Count 3,000 3,000 3,000 Groundcover Pavement Pavement Pavement Sources: For QC, flow rate, and collocation assessment information - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audit dates - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 no obstruction no obstruction 7.6 meters No Furnace or Flue U.S. Hwy 85 31 meters, N 3,000 Pavement Page 99 of 204 CAVE CREEK County ID: CC AQS ID: 04-013-4008 Address: 37019 N Lava Lane, Phoenix Coordinates: 33.82169 N, -112.01726 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information Pollutant O3 Parameter Code 44201 Parameter Occurrence Code 1 Collection Frequency Continuous Analysis Method (filter samples only) Not Applicable Any Proposal to Remove or Move Monitor? No Does monitor operation meet 40 CFR Part 58, Subpart G – Appendices A, C, D, and E? Yes Is site suitable for comparison to the annual PM2.5 NAAQS as per §58.30? Not Applicable Are Data Comparable to Respective NAAQS? Yes Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) Checks Performed in 2020 (Gases) 24 Frequency of 1-Point QC (Precision) Checks Bi-weekly 2Number of Flow Rate Verifications Performed in 2020 (PM) Not Applicable Frequency of Flow Rate Verifications Number of PE Audits Performed in 2020 2 03/09/20 Dates of PE Audits 10/05/20 Annual Precision & PE Audit Reports Submitted to AQS? Yes Date of Annual Data Certification Submission 04/30/21 Appendix B Requirements - PSD Monitoring - Not Applicable Appendix C Requirements - Monitoring Methodology Date Sampling Started 07/20/2001 Monitor Type SLAMS Monitor Make - Model Teledyne - API Model 400T Method Code 087 Method Type (FRM, FEM, ARM) FEM Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 100 of 204 CAVE CREEK Appendix D Requirements - Network Design Criteria Site Type Max Ozone Concentration Basic Monitoring Objective NAAQS Comparison Monitoring Scale (Spatial Scale Represented) Urban Monitoring Season Jan-Dec Network Meets Minimum Number of Monitors Required? Yes Appendix E Requirements - Probe and Monitoring Path Siting Criteria Distance between collocated samplers Not Applicable Probe Height (distance above ground level to inlet) 4.4 meters Airflow Arc 360º Probe Sample Line Material FEP Pollutant Sample Residence Time 9.95 seconds Horizontal 0 meters Distance from Supporting Structure/Roof (horizontal distance and vertical distance to probe/inlet) Vertical 2 meters Horizontal no obstruction Distance from Obstructions on Roof (horizontal distance to obstruction and vertical height of obstruction above probe/inlet) Vertical no obstruction Horizontal no obstruction Distance from Obstructions Not on Roof (horizontal distance to the obstruction and vertical height of obstruction above probe/inlet) Vertical 10 meters Distance from Dripline of Closest Tree(s) 10 meters Distance to Furnace or Flue No Furnace or Flue Nearest Major Roadway 32nd Street Distance and Direction to Road 240 meters, NE Average Daily Traffic Count 1,000 Groundcover Pavement Sources: For QC, flow rate, and collocation assessment information - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audit dates - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 101 of 204 CENTRAL PHOENIX County ID: CP AQS ID: 04-013-3002 Address: 1645 E Roosevelt St., Phoenix Coordinates: 33.45797 N, -112.04659 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information CO NO2 O3 42101 42602 44201 1 6 1 Continuous Continuous Continuous Pollutant SO2 Parameter Code 42401 Parameter Occurrence Code 4 Collection Frequency Continuous Analysis Method Not Applicable Not Applicable Not Applicable Not Applicable (filter samples only) Any Proposal to Remove or Move Monitor? No No No No Does monitor operation meet 40 CFR Part 58, Yes Yes Yes Yes Subpart G – Appendices A, C, D, and E? Is site suitable for comparison to the annual PM2.5 Not Applicable Not Applicable Not Applicable Not Applicable NAAQS as per §58.30? Are Data Comparable to Respective NAAQS? Yes Yes Yes Yes Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) Checks 26 25 26 26 Performed in 2020 (Gases) Frequency of 1-Point QC (Precision) Checks Bi-weekly Bi-weekly Bi-weekly Bi-weekly Number of Flow Rate Verifications Performed in 2020 (PM) Not Applicable Not Applicable Not Applicable Not Applicable Frequency of Flow Rate Verifications Number of PE Audits Performed in 2020 2 2 2 3 Dates of PE Audits Annual Precision & PE Audit Reports Submitted to AQS? Date of Annual Data Certification Submission PM10 81102 4 Continuous Not Applicable No Yes Not Applicable Yes Not Applicable 26 Bi-weekly 4 01/16/20 04/13/20 07/08/20 10/14/20 05/13/20 11/10/20 02/19/20 07/08/20 06/10/20 12/09/20 04/14/20 09/17/20 10/14/20 Yes Yes Yes Yes Yes 04/30/21 04/30/21 04/30/21 04/30/21 04/30/21 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 102 of 204 CENTRAL PHOENIX Appendix B Requirements - PSD Monitoring - Not Applicable Appendix C Requirements - Monitoring Methodology Date Sampling Started 10/01/1966 01/01/1967 06/01/1967 Monitor Type SLAMS SLAMS SLAMS Teledyne API Teledyne API Teledyne API Monitor Make - Model Model 300T Model 200T Model 400T Method Code 093 099 087 PM Monitor Flow Type Not Applicable Not Applicable Not Applicable PM Monitor Collection Type Not Applicable Not Applicable Not Applicable Method Type (FRM, FEM, ARM) FRM FRM FEM Appendix D Requirements - Network Design Criteria Population Highest Population Site Type Exposure Concentration Exposure NAAQS NAAQS NAAQS Basic Monitoring Objective Comparison Comparison Comparison Monitoring Scale (Spatial Scale Represented) Neighborhood Neighborhood Neighborhood Monitoring Season Jan-Dec Jan-Dec Jan-Dec Network Meets Minimum Number of Monitors Yes Yes Yes Required? Appendix E Requirements - Probe and Monitoring Path Siting Criteria Distance between collocated samplers Not Applicable Not Applicable Not Applicable Probe Height (distance above ground level to inlet) Airflow Arc Probe Sample Line Material Pollutant Sample Residence Time Distance from Supporting Structure/Roof (horizontal distance and vertical distance to probe/inlet) 01/01/1965 SLAMS Teledyne API Model 100T 100 Not Applicable Not Applicable FEM 04/01/1985 SLAMS Thermo - TEOM 1405-S 079 Low Volume Size Specific FEM Highest Concentration NAAQS Comparison Neighborhood Jan-Dec Population Exposure NAAQS Comparison Neighborhood Jan-Dec Yes Yes Not Applicable Not Applicable 4.4 meters 4.4 meters 4.4 meters 4.4 meters 4.4 meters 360º FEP 11.99 seconds 360º FEP 11.99 seconds 360º FEP 11.99 seconds 360º FEP 11.99 seconds 360º Not Applicable Not Applicable Horizontal 0 meters 0 meters 0 meters 0 meters 0 meters Vertical 2 meters 2 meters 2 meters 2 meters 2.4 meters Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 103 of 204 Distance from Obstructions on Roof (horizontal distance to obstruction and vertical height of obstruction above probe/inlet) CENTRAL PHOENIX Horizontal no obstruction no obstruction no obstruction no obstruction no obstruction Vertical no obstruction no obstruction no obstruction no obstruction no obstruction Horizontal no obstruction no obstruction no obstruction no obstruction no obstruction Vertical no obstruction no obstruction no obstruction no obstruction no obstruction no tree no tree no tree no tree No Furnace or No Furnace or No Furnace or No Furnace or Distance to Furnace or Flue Flue Flue Flue Flue Nearest Major Roadway A 16th Street 16th Street 16th Street 16th Street Distance and Direction to Road 88 meters, W 88 meters, W 88 meters, W 88 meters, W Average Daily Traffic Count 24,000 24,000 24,000 24,000 Nearest Major Roadway B Roosevelt St. Roosevelt St. Roosevelt St. Roosevelt St. Distance and Direction to Road 75 meters, N 75 meters, N 75 meters, N 75 meters, N Average Daily Traffic Count 21,637 21,637 21,637 21,637 Groundcover Pavement Pavement Pavement Pavement Sources: For QC, flow rate, and collocation assessment information - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audit dates - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) no tree No Furnace or Flue 16th Street 91 meters, W 24,000 Roosevelt St. 75 meters, N 21,637 Pavement Distance from Obstructions Not on Roof (horizontal distance to the obstruction and vertical height of obstruction above probe/inlet) Distance from Dripline of Closest Tree(s) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 104 of 204 DURANGO COMPLEX County ID: DC AQS ID: 04-013-9812 Address: 2702 RC Esterbrooks Blvd., Phoenix Coordinates: 33.42650 N, -112.11812 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information Pollutant PM10 PM2.5 Parameter Code 81102 88101 Parameter Occurrence Code 1 3 Collection Frequency Continuous Continuous Analysis Method (filter samples only) Not Applicable Not Applicable Any Proposal to Remove or Move Monitor? No No Does monitor operation meet 40 CFR Part 58, Subpart G – Appendices A, C, D, and E? Yes Yes Is site suitable for comparison to the annual PM2.5 NAAQS as per §58.30? Not Applicable Yes Are Data Comparable to Respective NAAQS? Yes Yes Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) Checks Performed in 2020 (Gases) Not Applicable Not Applicable Frequency of 1-Point QC (Precision) Checks Number of Flow Rate Checks Performed in 2020 (PM) 26 26 Frequency of Flow Rate Verifications Bi-Weekly Bi-Weekly Number of PE Audits Performed in 2020 4 4 01/22/20 01/22/20 04/15/20 04/15/20 Dates of PE Audits 07/07/20 07/07/20 10/13/20 10/13/20 Annual Precision & PE Audit Reports Submitted to AQS? Yes Yes 04/30/21 04/30/21 Date of Annual Data Certification Submission SO2 42401 1 Continuous Not Applicable No Yes Not Applicable Yes 26 Bi-Weekly Not Applicable 2 02/03/20 08/04/20 Yes 04/30/21 Appendix B Requirements - PSD Monitoring - Not Applicable Appendix C Requirements - Monitoring Methodology Date Sampling Started 07/01/1999 Monitor Type SLAMS Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 07/01/2005 SLAMS Page 105 of 204 01/01/2011 SLAMS DURANGO COMPLEX Thermo - TEOM 1405-DF Thermo - TEOM 1405-DF Teledyne API – 100T Method Code 208 PM Monitor Flow Type Low Volume PM Monitor Collection Type Dichotomous Method Type (FRM, FEM, ARM) FEM Appendix D Requirements - Network Design Criteria Population Site Type Exposure NAAQS Basic Monitoring Objective Comparison Monitoring Scale (Spatial Scale Represented) Neighborhood Monitoring Season Jan-Dec 182 Low Volume Dichotomous FEM 100 Not Applicable Not Applicable FEM Highest Concentration NAAQS Comparison Neighborhood Jan-Dec Highest Concentration NAAQS Comparison Middle Jan-Dec Yes Yes Not Applicable 0 meters Not Applicable Not Applicable 4.4 meters 360º Not Applicable Not Applicable 4.4 meters 360º Not Applicable Not Applicable 4.4 meters 360º FEP 5.32 seconds Monitor Make - Model Note: The same monitor measures PM 10 and PM 2.5. Network Meets Minimum Number of Monitors Required? Yes Appendix E Requirements - Probe and Monitoring Path Siting Criteria Distance between collocated samplers Not Applicable Distance between PM monitor inlets? 0 meters Note: The TEOM 1405-DF collects air for both PM 10 and PM 2.5 measurements through the same inlet. Probe Height (distance above ground level to inlet) Airflow Arc Probe Sample Line Material Pollutant Sample Residence Time Distance from Supporting Structure/Roof (horizontal distance and vertical distance to probe/inlet) Horizontal 0 meters 0 meters 0 meters Vertical 2 meters 2 meters 2 meters Distance from Obstructions on Roof (horizontal distance to obstruction and vertical height of obstruction above probe/inlet) Horizontal no obstructions no obstructions no obstructions Vertical no obstructions no obstructions no obstructions Distance from Obstructions Not on Roof (horizontal distance to the obstruction and vertical height of obstruction above probe/inlet) Horizontal 12 meters 12 meters 12 meters Vertical 6 meters 6 meters 6 meters Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 106 of 204 DURANGO COMPLEX Distance from Dripline of Closest Tree(s) Sources: 10.7 meters 10.7 meters No Furnace or No Furnace or Flue Distance to Furnace or Flue Flue Nearest Major Roadway 27th Ave 27th Ave Distance and Direction to Road 78 meters, E 76 meters, E Average Daily Traffic Count 16,000 16,000 Groundcover Pavement Pavement For QC, flow rate, and collocation assessment information - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audit dates - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 10.7 meters No Furnace or Flue 27th Ave 76 meters, E 16,000 Pavement Page 107 of 204 DYSART County ID: DY AQS ID: 04-013-4010 Address: 16825 N Dysart Rd., Surprise Coordinates: 33.63718 N, -112.34185 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information Pollutant O3 Parameter Code 44201 Parameter Occurrence Code 1 Collection Frequency Continuous Analysis Method (filter samples only) Not Applicable Any Proposal to Remove or Move Monitor? No Does monitor operation meet 40 CFR Part 58, Subpart G – Appendices A, C, D, and E? Yes Is site suitable for comparison to the annual PM2.5 NAAQS as per §58.30? Not Applicable Are Data Comparable to Respective NAAQS? Yes PM10 81102 1 Continuous Not Applicable No Yes Not Applicable Yes Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) Checks Performed in 2020 (Gases) Frequency of 1-Point QC (Precision) Checks Number of Flow Rate Verifications Performed in 2020 (PM) Frequency of Flow Rate Verifications Number of PE Audits Performed in 2020 26 Bi-Weekly Not Applicable 2 Dates of PE Audits 02/20/20 08/04/20 Annual Precision & PE Audit Reports Submitted to AQS? Date of Annual Data Certification Submission Yes 04/30/21 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Not Applicable 26 Bi-Weekly 4 01/28/20 04/15/20 07/07/20 10/13/20 Yes 04/30/21 Page 108 of 204 DYSART Appendix B Requirements - PSD Monitoring - Not Applicable Appendix C Requirements - Monitoring Methodology Date Sampling Started 7/21/2003 Monitor Type SLAMS Monitor Make - Model Teledyne API – 400T Method Code 087 PM Monitor Flow Type Not Applicable PM Monitor Collection Type Not Applicable Method Type (FRM, FEM, ARM) FEM Appendix D Requirements - Network Design Criteria Site Type Population Exposure Basic Monitoring Objective NAAQS Comparison Monitoring Scale (Spatial Scale Represented) Neighborhood Monitoring Season Jan-Dec Network Meets Minimum Number of Monitors Required? Yes Appendix E Requirements - Probe and Monitoring Path Siting Criteria Distance between collocated samplers Not Applicable Probe Height (distance above ground level to inlet) 5.4 meters Airflow Arc 360º Probe Sample Line Material FEP Pollutant Sample Residence Time 4.45 seconds Horizontal 0 meters Distance from Supporting Structure/Roof (horizontal distance and vertical distance to probe/inlet) Vertical 3 meters Horizontal no obstructions Distance from Obstructions on Roof (horizontal distance to obstruction and vertical height of obstruction above probe/inlet) Vertical no obstructions Distance from Obstructions Not on Roof (horizontal distance to the obstruction and vertical height of obstruction above probe/inlet) Population Exposure NAAQS Comparison Neighborhood Jan-Dec Yes Not Applicable 5.2 meters 360º Not Applicable Not Applicable 0 meters 3 meters no obstructions no obstructions Horizontal 15.2 meters 15.2 meters Vertical 3 meters no tree No Furnace or Flue Dysart 17 meters, W 3 meters no tree No Furnace or Flue Dysart 12 meters, W Distance from Dripline of Closest Tree(s) Distance to Furnace or Flue Nearest Major Roadway A Distance and Direction to Road Final – 2020 Air Monitoring Network and 2021 Plan 07/14/2003 SLAMS Thermo - TEOM 1405-S 079 Low Volume Size Specific FEM June 23, 2021 Page 109 of 204 Sources: DYSART Average Daily Traffic Count 12,000 12,000 Nearest Major Roadway B Bell Rd Bell Rd Distance and Direction to Road 495 meters, N 460 meters, N Average Daily Traffic Count 43,000 43,000 Groundcover Pavement / Gravel Pavement / Gravel For QC, flow rate, and collocation assessment information - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audit dates - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 110 of 204 FALCON FIELD County ID: FF AQS ID: 04-013-1010 Address: 4530 E McKellips Rd, Mesa Coordinates: 33.45244 N, -111.73327 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information Pollutant Parameter Code Parameter Occurrence Code Collection Frequency Analysis Method (filter samples only) Any Proposal to Remove or Move Monitor? Does monitor operation meet 40 CFR Part 58, Subpart G – Appendices A, C, D, and E? Is site suitable for comparison to the annual PM2.5 NAAQS as per §58.30? Are Data Comparable to Respective NAAQS? Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) Checks Performed in 2020 (Gases) Frequency of 1-Point QC (Precision) Checks Number of Flow Rate Verifications Performed in 2020 (PM) Frequency of Flow Rate Verifications Number of PE Audits Performed in 2020 Dates of PE Audits Annual Precision & PE Audit Reports Submitted to AQS? Date of Annual Data Certification Submission Appendix B Requirements - PSD Monitoring - Not Applicable Appendix C Requirements - Monitoring Methodology Date Sampling Started Monitor Type Monitor Make - Model Method Code Method Type (FRM, FEM, ARM) Appendix D Requirements - Network Design Criteria Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 O3 44201 1 Continuous Not Applicable No Yes Not Applicable Yes 24 Bi-Weekly Not Applicable 2 01/07/20 07/08/20 Yes 04/30/20 06/01/1989 SLAMS Teledyne API – 400T 087 FEM Page 111 of 204 FALCON FIELD Site Type Basic Monitoring Objective Monitoring Scale (Spatial Scale Represented) Monitoring Season Network Meets Minimum Number of Monitors Required? Appendix E Requirements - Probe and Monitoring Path Siting Criteria Distance between collocated samplers Probe Height (distance above ground level to inlet) Airflow Arc Probe Sample Line Material Pollutant Sample Residence Time Distance from Supporting Structure/Roof (horizontal distance and vertical distance to probe/inlet) Distance from Obstructions on Roof (horizontal distance to obstruction and vertical height of obstruction above probe/inlet) Distance from Obstructions Not on Roof (horizontal distance to the obstruction and vertical height of obstruction above probe/inlet) Sources: Population Exposure NAAQS Comparison Neighborhood Jan-Dec Yes Not Applicable 4.4 meters 360º FEP 18.33 seconds Horizontal Vertical Horizontal 1 meter 2 meters no obstruction Vertical no obstruction Horizontal 24.4 meters 3 meters Distance from Dripline of Closest Tree(s) no tree Distance to Furnace or Flue No Furnace or Flue Nearest Major Roadway McKellips Distance and Direction to Road 58 meters, S Average Daily Traffic Count 29,000 Groundcover Pavement For QC, flow rate, and collocation assessment information - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audit dates - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Vertical Page 112 of 204 FOUNTAIN HILLS County ID: FH AQS ID: 04-013-9704 Address: 16426 E. Palisades Blvd., Fountain Hills Coordinates: 33.61092 N, -111.72534 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information Pollutant Parameter Code Parameter Occurrence Code Collection Frequency Analysis Method (filter samples only) Any Proposal to Remove or Move Monitor? Does monitor operation meet 40 CFR Part 58, Subpart G – Appendices A, C, D, and E? Is site suitable for comparison to the annual PM2.5 NAAQS as per §58.30? Are Data Comparable to Respective NAAQS? Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) Checks Performed in 2020 (Gases) Frequency of 1-Point QC (Precision) Checks Number of Flow Rate Verifications Performed in 2020 (PM) Frequency of Flow Rate Verifications Number of PE Audits Performed in 2020 Dates of PE Audits Annual Precision & PE Audit Reports Submitted to AQS? Date of Annual Data Certification Submission Appendix B Requirements - PSD Monitoring - Not Applicable Appendix C Requirements - Monitoring Methodology Date Sampling Started Monitor Type Monitor Make – Model Method Code Method Type (FRM, FEM, ARM) Final – 2020 Air Monitoring Network and 2021 Plan O3 44201 1 Continuous Not Applicable No Yes Not Applicable Yes 25 Bi-Weekly Not Applicable 2 02/12/20 09/09/20 Yes 04/30/21 04/01/1996 SLAMS Teledyne API – 400T 087 FEM June 23, 2021 Page 113 of 204 FOUNTAIN HILLS Appendix D Requirements - Network Design Criteria Site Type Basic Monitoring Objective Monitoring Scale (Spatial Scale Represented) Monitoring Season Network Meets Minimum Number of Monitors Required? Appendix E Requirements - Probe and Monitoring Path Siting Criteria Distance between collocated samplers Probe Height (distance above ground level to inlet) Airflow Arc Probe Sample Line Material Pollutant Sample Residence Time Population Exposure NAAQS Comparison Neighborhood Jan-Dec Yes Not Applicable 4.4 meters 360º FEP 9.09 seconds Distance from Supporting Structure/Roof (horizontal distance and vertical distance to probe/inlet) Horizontal 2 meters /Vertical 0 meters Distance from Obstructions on Roof (horizontal distance to obstruction and vertical height of obstruction above probe/inlet) Horizontal no obstructions Vertical no obstructions Distance from Obstructions Not on Roof (horizontal distance to the obstruction and vertical height of obstruction above probe/inlet) Horizontal 24.4 meters Sources: 4.8 meters Distance from Dripline of Closest Tree(s) 15 meters Distance to Furnace or Flue No Furnace or Flue Nearest Major Roadway Palisades Blvd Distance and Direction to Road 70 meters, SW Average Daily Traffic Count 8,000 Groundcover Pavement For QC, flow rate, and collocation assessment information - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audit dates - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Vertical Page 114 of 204 GLENDALE County ID: GL AQS ID: 04-013-2001 Address: 6001 W Olive, Glendale Coordinates: 33.57453 N, -112.19193 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information Pollutant O3 PM10 Parameter Code 44201 81102 Parameter Occurrence Code 1 1 Collection Frequency Continuous Continuous Analysis Method (filter samples only) Not Applicable Not Applicable Any Proposal to Remove or Move Monitor? No No Does monitor operation meet 40 CFR Part 58, Subpart G – Appendices A, C, D, and Yes Yes E? Is site suitable for comparison to the annual PM2.5 NAAQS as per §58.30? Not Applicable Not Applicable Are Data Comparable to Respective NAAQS? Yes Yes Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) Checks Performed in 2020 (Gases) 24 Not Applicable Frequency of 1-Point QC (Precision) Checks Bi-Weekly Number of Flow Rate Verifications Performed in 2020 (PM) 26 Not Applicable Frequency of Flow Rate Verifications Bi-Weekly Number of PE Audits Performed in 2020 2 6 02/13/20 05/07/20 08/13/20 04/22/20 Dates of PE Audits 11/04/20 10/08/20 11/18/20 12/01/20 Annual Precision & PE Audit Reports Submitted to AQS? Yes Yes 04/30/21 04/30/21 Date of Annual Data Certification Submission PM2.5 88101 3 Continuous Not Applicable No Yes Yes Yes Not Applicable Appendix B Requirements - PSD Monitoring - Not Applicable Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 115 of 204 26 Bi-Weekly 6 02/13/20 05/07/20 08/13/20 11/04/20 11/18/20 12/01/20 Yes 04/30/21 GLENDALE Appendix C Requirements - Monitoring Methodology Date Sampling Started 01/01/1974 Monitor Type SLAMS Teledyne API – Monitor Make - Model 400T 07/01/1987 SLAMS Thermo - TEOM 1405-DF 6/1/2011 SLAMS Thermo - TEOM 1405-DF 208 Low Volume Dichotomous FEM 182 Low Volume Dichotomous FEM Population Exposure NAAQS Comparison Neighborhood Jan-Dec Yes Population Exposure NAAQS Comparison Neighborhood Jan-Dec Yes Appendix E Requirements - Probe and Monitoring Path Siting Criteria Distance between collocated samplers Not Applicable Not Applicable Distance between PM10 and PM2.5 monitors Not Applicable 0 meters Not Applicable 0 meters Note: The same monitor measures PM 10 and PM 2.5. Method Code 087 PM Monitor Flow Type Not Applicable PM Monitor Collection Type Not Applicable Method Type (FRM, FEM, ARM) FEM Appendix D Requirements - Network Design Criteria Site Type Population Exposure NAAQS Comparison Neighborhood Jan-Dec Yes Basic Monitoring Objective Monitoring Scale (Spatial Scale Represented) Monitoring Season Network Meets Minimum Number of Monitors Required? Note: The TEOM 1405-DF collects air for both PM 10 and PM 2.5 measurements through the same inlet. Probe Height (distance above ground level to inlet) Airflow Arc Probe Sample Line Material Pollutant Sample Residence Time 4.4 meters 360º FEP 4.84 seconds 4.4 meters 360º Not Applicable Not Applicable 4.4 meters 360º Not Applicable Not Applicable Distance from Supporting Structure/Roof (horizontal distance and vertical distance to probe/inlet) Horizontal 0 meters 0 meters 0 meters Vertical 2 meters 2 meters 2 meters Distance from Obstructions on Roof (horizontal distance to obstruction and vertical height of obstruction above probe/inlet) Horizontal no obstructions no obstructions no obstructions Vertical no obstructions no obstructions no obstructions Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 116 of 204 GLENDALE Distance from Obstructions Not on Roof (horizontal distance to the obstruction and vertical height of obstruction above probe/inlet) Horizontal no obstructions no obstructions no obstructions Vertical no obstructions no obstructions no obstructions no tree no tree no tree Distance from Dripline of Closest Tree(s) Sources: Distance to Furnace or Flue No Furnace or Flue No Furnace or Flue Nearest Major Roadway A Olive Ave Olive Ave Distance and Direction to Road 225 meters, S 227 meters, S Average Daily Traffic Count 25,000 25,000 th Nearest Major Roadway B 59 Ave 59th Ave Distance and Direction to Road 475 meters, E 430 meters, E Average Daily Traffic Count 30,500 30,500 Groundcover Pavement Pavement For QC, flow rate, and collocation assessment information - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audit dates - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 No Furnace or Flue Olive Ave 227 meters, S 25,000 59th Ave 430 meters, E 30,500 Pavement Page 117 of 204 HIGLEY County ID: HI AQS ID: 04-013-4006 Address: 2207 S Higley Rd., Gilbert Coordinates: 33.30995 N, -111.72003 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information Pollutant Parameter Code Parameter Occurrence Code Collection Frequency Analysis Method (filter samples only) Any Proposal to Remove or Move Monitor? Does monitor operation meet 40 CFR Part 58, Subpart G – Appendices A, C, D, and E? Is site suitable for comparison to the annual PM2.5 NAAQS as per §58.30? Are Data Comparable to Respective NAAQS? Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) Checks Performed in 2020 (Gases) Frequency of 1-Point QC (Precision) Checks Number of Flow Rate Verifications Performed in 2020 (PM) Frequency of Flow Rate Verifications Number of PE Audits Performed in 2020 Dates of PE Audits Annual Precision & PE Audit Reports Submitted to AQS? Date of Annual Data Certification Submission Appendix B Requirements - PSD Monitoring - Not Applicable Appendix C Requirements - Monitoring Methodology Date Sampling Started Monitor Type Monitor Make - Model Method Code Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 PM10 81102 1 Continuous Not Applicable Yes Yes Not Applicable Not Applicable Not Applicable 25 Bi-Weekly 4 02/18/20 05/11/20 08/05/20 11/25/20 Yes 07/01/2000 SLAMS Thermo – TEOM 1405-S 079 Page 118 of 204 HIGLEY PM Monitor Flow Type Low Volume PM Monitor Collection Type Size Specific Method Type (FRM, FEM, ARM) FEM Appendix D Requirements - Network Design Criteria Site Type Population Exposure Basic Monitoring Objective NAAQS Comparison Monitoring Scale (Spatial Scale Represented) Neighborhood Monitoring Season Jan-Dec Network Meets Minimum Number of Monitors Required? Yes Appendix E Requirements - Probe and Monitoring Path Siting Criteria Distance between collocated samplers Not Applicable Probe Height (distance above ground level to inlet) 4.4 meters Airflow Arc 360º Probe Sample Line Material Not Applicable Pollutant Sample Residence Time Not Applicable Horizontal 0 meters Distance from Supporting Structure/Roof (horizontal distance and vertical distance to probe/inlet) Vertical 2 meters Horizontal no obstructions Distance from Obstructions on Roof (horizontal distance to obstruction and vertical height of obstruction above probe/inlet) Vertical no obstructions Horizontal 7.6 meters Distance from Obstructions Not on Roof (horizontal distance to the obstruction and vertical height of obstruction above probe/inlet) Vertical 1.5 meters Distance from Dripline of Closest Tree(s) 15.2 meters Distance to Furnace or Flue No Furnace or Flue Nearest Major Roadway A Higley Rd Distance and Direction to Road 117 meters, E Average Daily Traffic Count 11,500 Nearest Major Roadway B Williams Field Rd Distance and Direction to Road 410 meters, S Average Daily Traffic Count 11,500 Groundcover Pavement Sources: For QC, flow rate, and collocation assessment information - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audit dates - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 119 of 204 HUMBOLDT MOUNTAIN County ID: HM AQS ID: 04-013-9508 Address: E State Hwy 562- FAA Radar Station, Tonto National Forest Coordinates: 33.98280 N, -111.79871 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information Pollutant O3 Parameter Code 44201 Parameter Occurrence Code 1 Collection Frequency Continuous Analysis Method (filter samples only) Not Applicable Any Proposal to Remove or Move Monitor? No Does monitor operation meet 40 CFR Part 58, Subpart G – Appendices A, C, D, and E? Yes Is site suitable for comparison to the annual PM2.5 NAAQS as per §58.30? Not Applicable Are Data Comparable to Respective NAAQS? Yes Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) Checks Performed in 2020 (Gases) 21 Frequency of 1-Point QC (Precision) Checks Bi-Weekly Number of Flow Rate Verifications Performed in 2020 (PM or Pb) Not Applicable Frequency of Flow Rate Verifications Number of PE Audits Performed in 2020 1 Dates of PE Audits 04/15/20 Annual Precision & PE Audit Reports Submitted to AQS? Yes Date of Annual Data Certification Submission 04/30/20 Appendix B Requirements - PSD Monitoring - Not Applicable Appendix C Requirements - Monitoring Methodology Date Sampling Started 08/01/1995 Monitor Type SLAMS Monitor Make - Model Teledyne API – 400T Method Code 087 Method Type (FRM, FEM, ARM) FEM Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 120 of 204 HUMBOLDT MOUNTAIN Appendix D Requirements - Network Design Criteria Site Type Maximum O3 Concentration Basic Monitoring Objective NAAQS Comparison Monitoring Scale (Spatial Scale Represented) Regional Monitoring Season Jan-Dec Network Meets Minimum Number of Monitors Required? Yes Appendix E Requirements - Probe and Monitoring Path Siting Criteria Distance between collocated samplers Not Applicable Probe Height (distance above ground level to inlet) 4 meters Airflow Arc 360º Probe Sample Line Material FEP Pollutant Sample Residence Time 6.01 seconds Horizontal 0 meters Distance from Supporting Structure/Roof (horizontal distance and vertical distance to probe/inlet) Vertical 2 meters Horizontal no obstruction Distance from Obstructions on Roof (horizontal distance to obstruction and vertical height of obstruction above probe/inlet) Vertical no obstruction Distance from Obstructions Not on Roof (horizontal distance to the obstruction and vertical height of obstruction above probe/inlet) Sources: Horizontal Vertical Distance from Dripline of Closest Tree(s) Distance to Furnace or Flue no obstruction no obstruction no tree No Furnace or Flue Nearest Major Roadway - Remote Mountaintop - Access using E. State Hwy 562 No Major Roadway Distance and Direction to Road Not Applicable Average Daily Traffic Count Not Applicable Groundcover Soil / Vegetation For QC, flow rate, and collocation assessment information - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audit dates - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 121 of 204 MESA County ID: ME AQS ID: 04-013-1003 Address: 310 S Brooks, Mesa Coordinates: 33.41018 N, -111.86536 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information Pollutant CO O3 PM10 Parameter Code 42101 44201 81102 Parameter Occurrence Code 1 1 1 Collection Frequency Continuous Continuous Continuous Analysis Method (filter samples only) Not Applicable Not Applicable Not Applicable Any Proposal to Remove or Move Monitor? No No No Does monitor operation meet 40 CFR Part 58, Subpart G – Appendices A, Yes Yes Yes C, D, and E? Is site suitable for comparison to the annual PM2.5 NAAQS as per §58.30? Not Applicable Not Applicable Not Applicable Are Data Comparable to Respective NAAQS? Yes Yes Yes Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) Checks Performed in 2020 (Gases) 26 26 Not Applicable Frequency of 1-Point QC (Precision) Checks Bi-Weekly Bi-Weekly Number of Flow Rate Verifications Performed in 2020 (PM) 25 Not Applicable Not Applicable Frequency of Flow Rate Verifications Bi-Weekly Number of PE Audits Performed in 2020 3 2 5 Dates of PE Audits 01/28/20 06/11/20 08/06/20 Annual Precision & PE Audit Reports Submitted to AQS? Date of Annual Data Certification Submission Yes 04/30/21 PM2.5 88101 3 Continuous Not Applicable No Yes Yes Yes Not Applicable 04/02/20 10/15/20 02/06/20 05/14/20 08/06/20 11/13/20 11/25/20 02/06/20 05/14/20 08/06/20 11/13/20 11/25/20 Yes 04/30/21 Yes 04/30/21 Yes 04/30/21 Appendix B Requirements - PSD Monitoring - Not Applicable Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 25 Bi-Weekly 5 Page 122 of 204 MESA Appendix C Requirements - Monitoring Methodology Date Sampling Started 01/01/1978 11/1/2012 Monitor Type SLAMS SLAMS Teledyne API – Teledyne API – Monitor Make - Model 300T 400T Note: The same monitor measures PM 10 and PM 2.5. Method Code 093 087 PM Monitor Flow Type Not Applicable Not Applicable PM Monitor Collection Type Not Applicable Not Applicable Method Type (FRM, FEM, ARM) FRM FEM Appendix D Requirements - Network Design Criteria Population Population Site Type Exposure Exposure NAAQS NAAQS Basic Monitoring Objective Comparison Comparison Monitoring Scale (Spatial Scale Represented) Neighborhood Neighborhood 11/1/2012 SLAMS Thermo - TEOM 1405-DF 11/1/2012 SLAMS Thermo - TEOM 1405-DF 208 Low Volume Dichotomous FEM 182 Low Volume Dichotomous FEM Population Exposure NAAQS Comparison Neighborhood Population Exposure NAAQS Comparison Neighborhood Monitoring Season Sep-Mar Jan-Dec Jan-Dec Jan-Dec Network Meets Minimum Number of Monitors Required? Yes Yes Yes Yes Appendix E Requirements - Probe and Monitoring Path Siting Criteria Distance between collocated samplers Not Applicable Not Applicable Not Applicable Distance between PM10 and PM2.5 monitors Not Applicable Not Applicable 0 meters NOTE: The TEOM 1405-DF collects air for both PM 10 and PM 2.5 measurements through the same inlet. Probe Height (distance above ground level to inlet) Airflow Arc Probe Sample Line Material Pollutant Sample Residence Time Distance from Supporting Structure/Roof (horizontal distance and vertical distance to probe/inlet) Not Applicable 0 meters 4.4 meters 360º FEP 5.84 seconds 4.4 meters 360º FEP 5.84 seconds 4.4 meters 360º Not Applicable Not Applicable 4.4 meters 360º Not Applicable Not Applicable Horizontal 0 meters 0 meters 0 meters 0 meters Vertical 2 meters 2 meters 2 meters 2 meters Horizontal no obstruction no obstruction no obstruction no obstruction Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 123 of 204 Distance from Obstructions on Roof (horizontal distance to obstruction and Vertical vertical height of obstruction above probe/inlet) Distance from Obstructions Not on Horizontal Roof (horizontal distance to the obstruction and vertical height of Vertical obstruction above probe/inlet) Distance from Dripline of Closest Tree(s) Sources: MESA no obstruction no obstruction no obstruction no obstruction no obstruction no obstruction no obstruction no obstruction no obstruction no obstruction no obstruction no obstruction no tree no tree no tree no tree No Furnace or No Furnace or No Furnace or No Furnace or Distance to Furnace or Flue Flue Flue Flue Flue Nearest Major Roadway Broadway Rd. Broadway Rd. Broadway Rd. Broadway Rd. Distance and Direction to Road 305 meters, S 305 meters, S 305 meters, S 305 meters, S Average Daily Traffic Count 33,000 33,000 33,000 33,000 Groundcover Pavement/Gravel Pavement/Gravel Pavement/Gravel Pavement/Gravel For QC, flow rate, and collocation assessment information - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audit dates - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 124 of 204 NORTH PHOENIX County ID: NP AQS ID: 04-013-1004 Address: 601 E Butler Dr., Phoenix Coordinates: 33.56034 N, -112.06627 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information Pollutant O3 PM10 Parameter Code 44201 81102 Parameter Occurrence Code 1 1 Collection Frequency Continuous Continuous Analysis Method (filter samples only) Not Applicable Not Applicable Any Proposal to Remove or Move Monitor? No No Does monitor operation meet 40 CFR Part 58, Subpart G – Appendices A, C, D, and E? Yes Yes Is site suitable for comparison to the annual PM2.5 NAAQS as per §58.30? Not Applicable Not Applicable Are Data Comparable to Respective NAAQS? Yes Yes Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) Checks Performed in 2020 (Gases) 26 Not Applicable Frequency of 1-Point QC (Precision) Checks Bi-Weekly Number of Flow Rate Verifications Performed in 2020 (PM) 26 Not Applicable Frequency of Flow Rate Verifications Bi-Weekly Number of PE Audits Performed in 2020 2 2 06/03/20 02/12/20 Dates of PE Audits 12/16/20 05/08/20 Annual Precision & PE Audit Reports Submitted to AQS? Yes Yes 04/30/21 04/30/21 Date of Annual Data Certification Submission PM2.5 88101 3 Continuous Not Applicable No Yes Yes Yes Not Applicable 26 Bi-Weekly 2 02/12/20 05/08/20 Yes 04/30/21 Appendix B Requirements - PSD Monitoring - Not Applicable Appendix C Requirements - Monitoring Methodology Date Sampling Started 01/01/1975 Monitor Type SLAMS Teledyne API – Monitor Make - Model 400T Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 9/1/2011 SLAMS Thermo TEOM 1405-DF 9/1/2011 SLAMS Thermo - TEOM 1405-DF Page 125 of 204 NORTH PHOENIX Note: The same monitor measures PM 10 and PM 2.5. Method Code 087 PM Monitor Flow Type Not Applicable PM Monitor Collection Type Not Applicable Method Type (FRM, FEM, ARM) FEM Appendix D Requirements - Network Design Criteria Max Ozone Site Type Concentration NAAQS Basic Monitoring Objective Comparison Monitoring Scale (Spatial Scale Represented) Neighborhood Monitoring Season Jan-Dec Network Meets Minimum Number of Monitors Required? Yes 208 Low Volume Dichotomous FEM 182 Low Volume Dichotomous FEM Population Exposure NAAQS Comparison Neighborhood Jan-Dec Population Exposure NAAQS Comparison Neighborhood Jan-Dec Yes Yes Appendix E Requirements - Probe and Monitoring Path Siting Criteria Distance between collocated samplers Not Applicable Not Applicable Distance between PM10 and PM2.5 monitors Not Applicable 0 meters NOTE: The TEOM 1405-DF collects air for both PM 10 and PM 2.5 measurements through the same inlet. Not Applicable 0 meters Probe Height (distance above ground level to inlet) Airflow Arc Probe Sample Line Material 4.6 meters 360º FEP 4.5 meters 360º Not Applicable 4.5 meters 360º Not Applicable Pollutant Sample Residence Time 2.04 seconds Not Applicable Not Applicable Horizontal 0 meters 0 meters 0 meters Vertical 2 meters 2 meters 2 meters Horizontal no obstruction no obstruction no obstruction Vertical no obstruction no obstruction no obstruction Horizontal no obstruction no obstruction no obstruction Distance from Supporting Structure/Roof (horizontal distance and vertical distance to probe/inlet) Distance from Obstructions on Roof (horizontal distance to obstruction and vertical height of obstruction above probe/inlet) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 126 of 204 NORTH PHOENIX Distance from Obstructions Not on Roof (horizontal distance to the Vertical obstruction and vertical height of obstruction above probe/inlet) Distance from Dripline of Closest Tree(s) Sources: no obstruction no obstruction 3 meters 3 meters No Furnace or No Furnace or Distance to Furnace or Flue Flue Flue th th Nearest Major Roadway 7 Street 7 Street Distance and Direction to Road 75 meters, E 75 meters, E Average Daily Traffic Count (ADT) 32,000 32,000 Groundcover Gravel Gravel For QC, flow rate, and collocation assessment information - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audit dates - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) 3 meters No Furnace or Flue th 7 Street 75 meters, E 32,000 Gravel Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 no obstruction Page 127 of 204 PINNACLE PEAK County ID: PP AQS ID: 04-013-2005 Address: 24295 N Alma School Rd., Scottsdale Coordinates: 33.70639 N, -111.85575 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information Pollutant Parameter Code Parameter Occurrence Code Collection Frequency Analysis Method (filter samples only) Any Proposal to Remove or Move Monitor? Does monitor operation meet 40 CFR Part 58, Subpart G – Appendices A, C, D, and E? Is site suitable for comparison to the annual PM2.5 NAAQS as per §58.30? Are Data Comparable to Respective NAAQS? Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) Checks Performed in 2020 (Gases) Frequency of 1-Point QC (Precision) Checks Number of Flow Rate Verifications Performed in 2020 (PM or Pb) Frequency of Flow Rate Verifications Number of PE Audits Performed in 2020 Dates of PE Audits Annual Precision & PE Audit Reports Submitted to AQS? Date of Annual Data Certification Submission Appendix B Requirements - PSD Monitoring - Not Applicable Appendix C Requirements - Monitoring Methodology Date Sampling Started Monitor Type Monitor Make - Model Method Code Method Type (FRM, FEM, ARM) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 O3 44201 1 Continuous Not Applicable No Yes Not Applicable Yes 24 Bi-Weekly Not Applicable 2 03/12/20 10/08/20 Yes 04/30/20 02/01/1988 SLAMS Teledyne API – 400T 087 FEM Page 128 of 204 PINNACLE PEAK Appendix D Requirements - Network Design Criteria Site Type Basic Monitoring Objective Monitoring Scale (Spatial Scale Represented) Monitoring Season Network Meets Minimum Number of Monitors Required? Appendix E Requirements - Probe and Monitoring Path Siting Criteria Distance between collocated samplers Probe Height (distance above ground level to inlet) Airflow Arc Probe Sample Line Material Pollutant Sample Residence Time Horizontal Distance from Supporting Structure/Roof (horizontal distance and vertical distance to probe/inlet) Vertical Distance from Obstructions on Roof (horizontal distance to obstruction and vertical height of obstruction above probe/inlet) Max Ozone Concentration NAAQS Comparison Urban Jan-Dec Yes Not Applicable 4.7 meters 360º FEP 5.37 seconds 0 meters 2.7 meters Horizontal no obstruction Vertical Horizontal Vertical no obstruction no obstruction no obstruction Distance from Obstructions Not on Roof (horizontal distance to the obstruction and vertical height of obstruction above probe/inlet) Distance from Dripline of Closest Tree(s) 10 meters Distance to Furnace or Flue No Furnace or Flue Nearest Major Roadway Happy Valley Rd. Distance and Direction to Road 61 meters, S Average Daily Traffic Count 16,000 Groundcover Pavement / Grass Sources: For QC, flow rate, and collocation assessment information - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audit dates - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 129 of 204 SOUTH PHOENIX County ID: SP AQS ID: 04-013-4003 Address: 33 W Tamarisk St., Phoenix Coordinates: 33.40314 N, -112.07526 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information Pollutant CO O3 PM10 Parameter Code 42101 44201 81102 Parameter Occurrence Code 1 1 1 Collection Frequency Continuous Continuous Continuous Analysis Method (filter samples only) Not Applicable Not Applicable Not Applicable Any Proposal to Remove or Move Monitor? No No No Does monitor operation meet 40 CFR Part 58, Subpart G – Appendices A, C, Yes Yes Yes D, and E? Is site suitable for comparison to the annual PM2.5 NAAQS as per §58.30? Not Applicable Not Applicable Not Applicable Are Data Comparable to Respective NAAQS? Yes Yes Yes Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) Checks Performed in 2020 (Gases) 25 25 Not Applicable Frequency of 1-Point QC (Precision) Checks Bi-Weekly Bi-Weekly Number of Flow Rate Verifications Performed in 2020 (PM) 26 Not Applicable Not Applicable Frequency of Flow Rate Verifications Bi-Weekly Number of PE Audits Performed in 2020 2 2 6 02/11/20 05/05/20 08/11/20 04/07/20 04/07/20 Dates of PE Audits 11/03/20 11/03/20 11/03/20 11/17/20 12/01/20 Annual Precision & PE Audit Reports Submitted to AQS? Yes Yes Yes 04/30/21 04/30/21 04/30/21 Date of Annual Data Certification Submission PM2.5 88101 3 Continuous Not Applicable No Yes Yes Yes Not Applicable Appendix B Requirements - PSD Monitoring - Not Applicable Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 130 of 204 26 Bi-Weekly 6 02/11/20 05/05/20 08/11/20 11/03/20 11/17/20 12/01/20 Yes 04/30/21 SOUTH PHOENIX Appendix C Requirements - Monitoring Methodology Date Sampling Started 10/01/1999 10/01/1999 Monitor Type SLAMS SLAMS Teledyne API – 300T Monitor Make - Model Teledyne API – 400T 7/1/2007 SLAMS 05/01/2010 SLAMS Thermo TEOM 1405DF Thermo TEOM 1405-DF Note: The same monitor measures PM 10 and PM 2.5. Method Code 093 087 PM Monitor Flow Type Not Applicable Not Applicable PM Monitor Collection Type Not Applicable Not Applicable Method Type (FRM, FEM, ARM) FRM FEM Appendix D Requirements - Network Design Criteria Population Population Site Type Exposure Exposure NAAQS NAAQS Basic Monitoring Objective Comparison Comparison Monitoring Scale (Spatial Scale Represented) Neighborhood Neighborhood Monitoring Season Jan-Dec Jan-Dec Network Meets Minimum Number of Monitors Required? Yes Yes Appendix E Requirements - Probe and Monitoring Path Siting Criteria Distance between collocated samplers Not Applicable Not Applicable Distance between PM10 and PM2.5 monitors Not Applicable Not Applicable 208 Low Volume Dichotomous FEM 182 Low Volume Dichotomous FEM Population Exposure NAAQS Comparison Neighborhood Jan-Dec Yes Population Exposure NAAQS Comparison Neighborhood Jan-Dec Yes Not Applicable 0 meters Not Applicable 0 meters Note: The TEOM 1405-DF collects air for both PM 10 and PM 2.5 measurements through the same inlet. Probe Height (distance above ground level to inlet) 4.4 meters 4.4 meters 4.3 meters 4.3 meters Airflow Arc 360º 360º 360º 360º Probe Sample Line Material FEP FEP Not Applicable Not Applicable Pollutant Sample Residence Time 4.95 seconds 4.95 seconds Not Applicable Not Applicable Horizontal 0 meters 0 meters 0 meters 0 meters Vertical 2 meters 2 meters 2 meters 2 meters Distance from Supporting Structure/Roof (horizontal distance and vertical distance to probe/inlet) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 131 of 204 Distance from Obstructions on Roof (horizontal distance to obstruction and vertical height of obstruction above probe/inlet) Distance from Obstructions Not on Roof (horizontal distance to the obstruction and vertical height of obstruction above probe/inlet) Distance from Dripline of Closest Tree(s) SOUTH PHOENIX Horizontal no obstruction no obstruction no obstruction no obstruction Vertical no obstruction no obstruction no obstruction no obstruction Horizontal 11 meters 11 meters 11 meters 11 meters Vertical 3 meters 3 meters 3 meters 3 meters 11 meters 11 meters 11 meters 11 meters No Furnace or No Furnace or No Furnace or Flue Flue Flue Nearest Major Roadway A Central Ave. Central Ave. Central Ave. Distance and Direction to Road 168 meters, E 168 meters, E 165 meters, E Average Daily Traffic Count 24,000 24,000 24,000 Nearest Major Roadway B Broadway Rd. Broadway Rd. Broadway Rd. Distance and Direction to Road 385 meters, N 385 meters, N 385 meters, N Average Daily Traffic Count 18,000 18,000 18,000 Groundcover Pavement Pavement Pavement For QC, flow rate, and collocation assessment information - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audit dates - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) Distance to Furnace or Flue Sources: Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 No Furnace or Flue Central Ave. 165 meters, E 24,000 Broadway Rd. 385 meters, N 18,000 Pavement Page 132 of 204 SOUTH SCOTTSDALE County ID: SS AQS ID: 04-013-3003 Address: 2857 N Miller Rd., Scottsdale Coordinates: 33.47968 N, -111.91711 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information Pollutant O3 Parameter Code 44201 Parameter Occurrence Code 1 Collection Frequency Continuous Analysis Method (filter samples only) Not Applicable Any Proposal to Remove or Move Monitor? No Does monitor operation meet 40 CFR Part 58, Subpart G – Appendices A, C, D, and E? Yes Is site suitable for comparison to the annual PM2.5 NAAQS as per §58.30? Not Applicable Are Data Comparable to Respective NAAQS? Yes Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) Checks Performed in 2020 (Gases) 24 Frequency of 1-Point QC (Precision) Checks Bi-Weekly Number of Flow Rate Verifications Performed in 2020 (PM) Not Applicable Frequency of Flow Rate Verifications Number of PE Audits Performed in 2020 2 Dates of PE Audits 01/08/20 Annual Precision & PE Audit Reports Submitted to AQS? Yes 04/30/21 Date of Annual Data Certification Submission Appendix B Requirements - PSD Monitoring - Not Applicable Appendix C Requirements - Monitoring Methodology Date Sampling Started 01/01/1974 Monitor Type SLAMS Monitor Make - Model Teledyne API – 400T Method Code 087 PM Monitor Flow Type Not Applicable Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 PM10 81102 1 Continuous Not Applicable No Yes Not Applicable Yes Not Applicable 24 Bi-Weekly 3 02/13/20 08/05/20 11/20/20 Yes 04/30/21 09/01/2012 SLAMS Thermo - TEOM 1405-S 079 Low Volume Page 133 of 204 SOUTH SCOTTSDALE PM Monitor Collection Type Not Applicable Method Type (FRM, FEM, ARM) FEM Appendix D Requirements - Network Design Criteria Site Type Population Exposure Basic Monitoring Objective NAAQS Comparison Monitoring Scale (Spatial Scale Represented) Neighborhood Monitoring Season Jan-Dec Network Meets Minimum Number of Monitors Required? Yes Appendix E Requirements - Probe and Monitoring Path Siting Criteria Distance between collocated samplers Not Applicable Probe Height (distance above ground level to inlet) 4.4 meters Airflow Arc 360º Probe Sample Line Material FEP Pollutant Sample Residence Time 8.38 seconds Horizontal 0.46 meters Distance from Supporting Structure/Roof (horizontal distance and vertical distance to probe/inlet) Vertical 2.4 meters Size Specific FEM Population Exposure NAAQS Comparison Neighborhood Jan-Dec Yes Not Applicable 3 meters 360º Not Applicable Not Applicable 0 meters Distance from Obstructions on Roof (horizontal distance to obstruction and vertical height of obstruction above probe/inlet) Horizontal no obstruction 0.46 meters no obstruction Vertical no obstruction no obstruction Distance from Obstructions Not on Roof (horizontal distance to the obstruction and vertical height of obstruction above probe/inlet) Horizontal Vertical 3 meters no obstruction Sources: 2.4 meters no obstruction Distance from Dripline of Closest Tree(s) no tree no tree Distance to Furnace or Flue No Furnace or Flue No Furnace or Flue Nearest Major Roadway A Thomas Rd. Thomas Rd. Distance and Direction to Road 66 meters, N 62 meters, N Average Daily Traffic Count 33,000 33,000 Nearest Major Roadway B Miller Rd. Miller Rd. Distance and Direction to Road 32 meters, W 35 meters, W Average Daily Traffic Count 13,000 13,000 Groundcover Pavement Pavement For QC, flow rate, and collocation assessment information - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audit dates - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 134 of 204 TEMPE County ID: TE AQS ID: 04-013-4005 Address: 1525 S College Ave., Tempe Coordinates: 33.4123 N, -111.93471 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information Pollutant O3 PM10 Parameter Code 44201 81102 Parameter Occurrence Code 1 1 Collection Frequency Continuous Continuous Analysis Method (filter samples only) Not Applicable Not Applicable Any Proposal to Remove or Move Monitor? No No Does monitor operation meet 40 CFR Part 58, Subpart G – Appendices A, C, D, and E? Yes Yes Is site suitable for comparison to the annual PM2.5 NAAQS as per §58.30? Not Applicable Not Applicable Are Data Comparable to Respective NAAQS? Yes Yes Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) Checks Performed in 2020 (Gases) 24 Not Applicable Frequency of 1-Point QC (Precision) Checks Bi-Weekly Number of Flow Rate Verifications Performed in 2020 (PM) 25 Not Applicable Frequency of Flow Rate Verifications Bi-Weekly Number of PE Audits Performed in 2020 2 5 02/01/20 05/05/20 05/05/20 08/11/20 Dates of PE Audits 11/03/20 11/03/20 11/17/20 Annual Precision & PE Audit Reports Submitted to AQS? Yes Yes 04/30/21 04/30/21 Date of Annual Data Certification Submission PM2.5 88101 3 Continuous Not Applicable No Yes Yes Yes Not Applicable Appendix B Requirements - PSD Monitoring - Not Applicable Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 135 of 204 25 Bi-Weekly 5 02/01/20 05/05/20 08/11/20 11/03/20 11/17/20 Yes 04/30/21 TEMPE Appendix C Requirements - Monitoring Methodology Date Sampling Started 07/01/2000 Monitor Type SLAMS Teledyne API – Monitor Make - Model 400T 03/01/2012 SLAMS Thermo - TEOM 1405-DF 03/01/2012 SLAMS Thermo - TEOM 1405-DF Method Code 087 208 PM Monitor Flow Type Not Applicable Low Volume PM Monitor Collection Type Not Applicable Dichotomous Method Type (FRM, FEM, ARM) FEM FEM Appendix D Requirements - Network Design Criteria Population Population Site Type Exposure Exposure NAAQS NAAQS Basic Monitoring Objective Comparison Comparison Monitoring Scale (Spatial Scale Represented) Neighborhood Neighborhood Monitoring Season Jan-Dec Jan-Dec Network Meets Minimum Number of Monitors Required? Yes Yes Appendix E Requirements - Probe and Monitoring Path Siting Criteria Distance between collocated samplers Not Applicable Not Applicable Distance between PM10 and PM2.5 monitors Not Applicable 0 meters 182 Low Volume Dichotomous FEM Note: The same monitor measures PM 10 and PM 2.5. Note: The TEOM 1405-DF collects air for both PM 10 and PM 2.5 measurements through the same inlet. Probe Height (distance above ground level to inlet) Airflow Arc Probe Sample Line Material Pollutant Sample Residence Time Distance from Supporting Structure/Roof (horizontal distance and vertical distance to probe/inlet) Distance from Obstructions on Roof (horizontal distance to obstruction and vertical height of obstruction above probe/inlet) Final – 2020 Air Monitoring Network and 2021 Plan Population Exposure NAAQS Comparison Neighborhood Jan-Dec Yes Not Applicable 0 meters 4.4 meters 360º FEP 5.13 seconds 3.1 meters 360º Not Applicable Not Applicable 3.1 meters 360º Not Applicable Not Applicable Horizontal 0.46 meters 0 meters 0 meters Vertical 2 meters 0.76 meters 0.76 meters Horizontal no obstruction no obstruction no obstruction Vertical no obstruction no obstruction no obstruction June 23, 2021 Page 136 of 204 TEMPE Distance from Obstructions Not on Roof (horizontal distance to the obstruction and vertical height of obstruction above probe/inlet) Sources: Horizontal no obstruction no obstruction no obstruction Vertical no obstruction no obstruction no obstruction Distance from Dripline of Closest Tree(s) no tree no tree Distance to Furnace or Flue No Furnace or Flue No Furnace or Flue Nearest Major Roadway Apache Blvd. Apache Blvd. Distance and Direction to Road 370 meters, N 370 meters, N Average Daily Traffic Count 32,170 32,170 Groundcover Gravel Gravel For QC, flow rate, and collocation assessment information - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audit dates - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 no tree No Furnace or Flue Apache Blvd. 370 meters, N 32,170 Gravel Page 137 of 204 THIRTY-THIRD County ID: TT AQS ID: 04-013-4020 Address: 3248 W Moreland Ave., Phoenix Coordinates: 33.46173 N, -112.12796 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information Pollutant CO NO2 PM2.5 Parameter Code Parameter Occurrence Code Collection Frequency Analysis Method (filter samples only) Any Proposal to Remove or Move Monitor? Does monitor operation meet 40 CFR Part 58, Subpart G – Appendices A, C, D, and E? Is site suitable for comparison to the annual PM2.5 NAAQS as per §58.30? 42101 1 Continuous Not Applicable Yes Yes Not Applicable 42602 1 Continuous Not Applicable No Yes Not Applicable 88101 3 Continuous Not Applicable Yes Yes Not Applicable Are Data Comparable to Respective NAAQS? Yes Yes Yes Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) Checks Performed in 2020 (Gases) 25 25 Frequency of 1-Point QC (Precision) Checks Bi-Weekly Bi-Weekly Number of Flow Rate Verifications in 2020 (PM) Not Applicable Not Applicable Frequency of Flow Rate Verifications Number of PE Audits Performed in 2020 1 2 Dates of PE Audits 03/09/20 Annual Precision & PE Audit Reports Submitted to AQS? Yes Date of Annual Data Certification Submission 04/30/21 Appendix B Requirements - PSD Monitoring - Not Applicable Appendix C Requirements - Monitoring Methodology Date Sampling Started 01/01/2020 Monitor Type SLAMS Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Not Applicable Yes 04/30/21 25 Bi-Weekly 4 01/27/20 06/16/20 07/13/20 12/15/20 Yes 04/30/21 09/01/2015 SLAMS 01/01/2020 SLAMS 02/10/20 08/10/20 Page 138 of 204 THIRTY-THIRD Monitor Make – Model Method Code Method Type (FRM, FEM, ARM) Teledyne API – 300T 093 FEM Thermo 42iQ 074 FRM Appendix D Requirements - Network Design Criteria Site Type Source-Oriented Source-Oriented NAAQS NAAQS Basic Monitoring Objective Comparison Comparison Monitoring Scale (Spatial Scale Represented) Micro Micro Monitoring Season Jan-Dec Jan-Dec Network Meets Minimum Number of Monitors Required? Yes Yes Appendix E Requirements - Probe and Monitoring Path Siting Criteria Distance between collocated samplers Not Applicable Not Applicable Probe Height (distance above ground level to inlet) 7 meters 7 meters Airflow Arc 360º 360º Probe Sample Line Material FEP FEP Pollutant Sample Residence Time 16.13 seconds 16.13 seconds 3 meters 3 meters 3 meters Distance from Supporting Structure/Roof (horizontal distance and vertical distance to probe/inlet) 0 meters 0 meters 0 meters Distance from Obstructions on Roof (horizontal no obstruction no obstruction no obstruction distance to obstruction and vertical height of no obstruction no obstruction no obstruction obstruction above probe/inlet) Distance from Obstructions Not on Roof (horizontal no obstruction no obstruction no obstruction distance to the obstruction and vertical height of no obstruction no obstruction no obstruction obstruction above probe/inlet) 15.2 meters 15.2 meters Distance from Dripline of Closest Tree(s) Distance to Furnace or Flue No Furnace or Flue No Furnace or Flue Nearest Major Roadway I-10 Distance and Direction to Road 13.5 meters, N 245,632 Average Daily Traffic Count Groundcover Gravel Sources: For QC, flow rate, and collocation assessment information - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audit dates - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Thermo - TEOM 1405-DF 182 FEM Source-Oriented NAAQS Comparison Micro Jan-Dec Yes Not Applicable 7 meters 360º FEP Not applicable 3 meters 0 meters no obstruction no obstruction no obstruction no obstruction 15.2 meters No Furnace or Flue Page 139 of 204 WEST 43RD AVENUE County ID: WF AQS ID: 04-013-4009 Address: 3940 W Broadway Rd., Phoenix Coordinates: 33.40635 N, -112.14426 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information Pollutant PM10 Parameter Code 81102 Parameter Occurrence Code 1 Collection Frequency Continuous Analysis Method (filter samples only) Not Applicable Any Proposal to Remove or Move Monitor? No Does monitor operation meet 40 CFR Part 58, Subpart G – Appendices A, C, D, and E? Yes Is site suitable for comparison to the annual PM2.5 NAAQS as per §58.30? Not Applicable Are Data Comparable to Respective NAAQS? Yes Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) Checks Performed in 2020 (Gases) Not Applicable Frequency of 1-Point QC (Precision) Checks Number of Flow Rate Verifications Performed in 2020 (PM) 25 Frequency of Flow Rate Verifications Bi-Weekly Number of PE Audits Performed in 2020 4 03/05/20 06/11/20 Dates of PE Audits 09/02/20 12/11/20 Annual Precision & PE Audit Reports Submitted to AQS? Yes Date of Annual Data Certification Submission 04/30/21 Appendix B Requirements - PSD Monitoring - Not Applicable Appendix C Requirements - Monitoring Methodology Date Sampling Started 04/01/2002 Monitor Type SLAMS Monitor Make - Model Thermo - TEOM 1405-S Method Code 079 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 140 of 204 WEST 43RD AVENUE PM Monitor Flow Type PM Monitor Collection Type Method Type (FRM, FEM, ARM) Appendix D Requirements - Network Design Criteria Site Type Basic Monitoring Objective Monitoring Scale (Spatial Scale Represented) Monitoring Season Network Meets Minimum Number of Monitors Required? Appendix E Requirements - Probe and Monitoring Path Siting Criteria Distance between collocated samplers Probe Height (distance above ground level to inlet) Airflow Arc Probe Sample Line Material Pollutant Sample Residence Time Distance from Supporting Structure/Roof (horizontal distance and vertical distance to Horizontal probe/inlet) Vertical Horizontal Distance from Obstructions on Roof (horizontal distance to obstruction and vertical height of obstruction above probe/inlet) Vertical Distance from Obstructions Not on Roof (horizontal distance to the obstruction and vertical height of obstruction above probe/inlet) Sources: Horizontal Low Volume Size Specific FEM Highest Concentration NAAQS Comparison Middle Jan-Dec Yes Not Applicable 5 meters 360º Not Applicable Not Applicable 0 meters 0.6 meters no obstruction no obstruction no obstruction no obstruction Distance from Dripline of Closest Tree(s) 4.5 meters Distance to Furnace or Flue No Furnace or Flue Nearest Major Roadway A Broadway Rd. (E of 35th Ave.) Distance and Direction to Road 37 meters, S Average Daily Traffic Count 12,501 Nearest Major Roadway B 35th Ave. (N. of Broadway Rd.) Distance and Direction to Road 1 kilometer, E Average Daily Traffic Count 19,699 Groundcover Gravel For QC, flow rate, and collocation assessment information - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audit dates - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Vertical Page 141 of 204 WEST CHANDLER County ID: WC AQS ID: 04-013-4004 Address: 275 S Ellis, Chandler Coordinates: 33.29896 N, -111.88426 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information Pollutant CO O3 Parameter Code 42101 44201 Parameter Occurrence Code 1 1 Collection Frequency Continuous Continuous Analysis Method (filter samples only) Not Applicable Not Applicable Any Proposal to Remove or Move Monitor? No No Does monitor operation meet 40 CFR Part 58, Subpart G – Appendices A, C, D, and E? Yes Yes Is site suitable for comparison to the annual PM2.5 NAAQS as per §58.30? Not Applicable Not Applicable Are Data Comparable to Respective NAAQS? Yes Yes Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) Checks Performed in 2020 (Gases) 23 23 Frequency of 1-Point QC (Precision) Checks Bi-Weekly Bi-Weekly Number of Flow Rate Verifications Performed in 2020 (PM) Not Applicable Not Applicable Frequency of Flow Rate Verifications Number of PE Audits Performed in 2020 2 2 Dates of PE Audits 03/09/20 09/23/20 04/06/20 10/21/20 Annual Precision & PE Audit Reports Submitted to AQS? Yes Date of Annual Data Certification Submission 04/30/21 Yes 04/30/21 PM10 81102 1 Continuous Not Applicable No Yes Not Applicable Yes Not Applicable Appendix B Requirements - PSD Monitoring - Not Applicable Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 142 of 204 24 Bi-Weekly 4 03/09/20 06/04/20 09/09/20 11/20/20 Yes 04/30/21 WEST CHANDLER Appendix C Requirements - Monitoring Methodology Date Sampling Started 07/01/2000 Monitor Type SLAMS Teledyne API – Monitor Make - Model 300T Method Code 093 PM Monitor Flow Type Not Applicable PM Monitor Collection Type Not Applicable Method Type (FRM, FEM, ARM) FRM 07/01/2000 SLAMS Teledyne API – 400T 087 Not Applicable Not Applicable 07/01/2000 SLAMS Thermo – TEOM 1405-S 079 Low Volume Size Specific FEM FEM Appendix D Requirements - Network Design Criteria Population Population Site Type Exposure Exposure NAAQS NAAQS Basic Monitoring Objective Comparison Comparison Monitoring Scale (Spatial Scale Represented) Neighborhood Neighborhood Monitoring Season Jan-Dec Jan-Dec Network Meets Minimum Number of Monitors Required? Yes Yes Appendix E Requirements - Probe and Monitoring Path Siting Criteria Distance between collocated samplers Not Applicable Not Applicable Probe Height (distance above ground level to inlet) 4.4 meters 4.4 meters Airflow Arc 360º 360º Probe Sample Line Material FEP FEP Pollutant Sample Residence Time 3.95 seconds 3.95 seconds Horizontal 0 meters 0 meters Distance from Supporting Structure/Roof (horizontal distance and vertical distance to probe/inlet) Vertical 2 meters 2 meters Distance from Obstructions on Roof (horizontal distance to Horizontal no obstruction no obstruction obstruction and vertical height of obstruction above Vertical no obstruction no obstruction probe/inlet) Distance from Obstructions Not on Roof (horizontal Horizontal 14 meters 14 meters distance to the obstruction and vertical height of obstruction Vertical 3 meters 3 meters above probe/inlet) Distance from Dripline of Closest Tree(s) 14 meters 14 meters Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Population Exposure NAAQS Comparison Neighborhood Jan-Dec Yes Not Applicable 4.4 meters 360º Not Applicable Not Applicable 0 meters 2 meters no obstruction no obstruction Page 143 of 204 14 meters 3 meters 14 meters WEST CHANDLER No Furnace or Flue Nearest Major Roadway A Frye Rd. Frye Rd. Distance and Direction to Road 30 meters, S 30 meters, S Average Daily Traffic Count 10,566 10,566 Pavement / Groundcover Pavement / Gravel Pavement / Gravel Gravel For 1-pt. precision checks, FR verifications, and collocation assessments - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audits - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) Distance to Furnace or Flue Sources: Final – 2020 Air Monitoring Network and 2021 Plan No Furnace or Flue June 23, 2021 No Furnace or Flue Frye Rd. 30 meters, S 10,566 Page 144 of 204 WEST PHOENIX County ID: WP AQS ID: 04-013-0019 Address: 3847 W Earll, Phoenix Coordinates: 33.48378 N, -112.14256 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information Pollutant CO NO2 O3 PM10 PM2.5 Primary PM2.5 Secondary Note: This is a collocated site for PM 2.5. Parameter Code 42101 42602 44201 81102 88101 88101 Parameter Occurrence Code 1 1 1 1 3 2 Collection Frequency Continuous Continuous Continuous Continuous Continuous 1 in 12 days As per 40 CFR Part 50, Appendix L Pace Analytical® IML Air Science Laboratory Analysis Method (filter samples only) Not Applicable Not Applicable Not Applicable Not Applicable Not Applicable Analytical Laboratory (filter samples only) Not Applicable Not Applicable Not Applicable Not Applicable Not Applicable Any Proposal to Remove or Move Monitor? No No No No No No Does monitor operation meet 40 CFR Part 58, Subpart G – Appendices A, C, D, and E? Yes Yes Yes Yes Yes Yes Is site suitable for comparison to the annual PM2.5 NAAQS as per §58.30? Not Applicable Not Applicable Not Applicable Not Applicable Yes Yes Are Data Comparable to Respective NAAQS? Yes Yes Yes Yes Ye s Yes Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 145 of 204 WEST PHOENIX Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) 25 23 25 Checks Performed in 2020 (Gases) Not Applicable Not Applicable Not Applicable Frequency of 1-Point QC (Precision) Bi-Weekly Bi-Weekly Bi-Weekly Checks Number of Flow Rate Verifications 25 25 11 Performed in 2020 (PM) Not Applicable Not Applicable Not Applicable Frequency of Flow Rate Bi-Weekly Bi-Weekly Bi-weekly Verifications Number of Required Collocated Assessments in 2020 Not Applicable Not Applicable Not Applicable Not Applicable 30 (PM2.5 Only) Number of Valid Collocation Assessments in 2020 Not Applicable Not Applicable Not Applicable Not Applicable 30 (PM2.5 Only) Number of Collocation Assessments in 2020 Not Applicable Not Applicable Not Applicable Not Applicable 31 (PM2.5 Only) Number of PE Audits Performed in 2 2 0* 5 5 5 2020 03/03/20 03/03/20 01/09/20 06/11/20 06/11/20 04/07/20 See comment 06/12/20 02/04/20 09/01/20 09/01/20 07/07/20 Dates of PE Audits 12/08/20 10/13/20 below 11/24/20 11/24/20 10/29/20 12/08/20 12/08/20 12/08/20 Annual Precision & PE Audit Yes Yes Yes Yes Yes Yes Reports Submitted to AQS? Date of Annual Data Certification Submission 04/30/21 04/30/21 04/30/21 04/30/21 04/30/21 04/30/21 * - In 2020, twenty-five 1-pt. precision QC checks were completed. Five 5-pt. verification/calibration QC checks were also completed, which tested the analyzer at the same concentration levels as the annual performance evaluation audit as well as checking linearity and proper installation. The 5-pt. checks Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 146 of 204 WEST PHOENIX occurred when a different analyzer was installed at the site. Although the required annual performance evaluation audit using a separate QA calibrator was missed. Close evaluation of all data (pollutant and P&A) supports that the data are valid. Appendix B Requirements - PSD Monitoring - Not Applicable Appendix C Requirements - Monitoring Methodology Date Sampling Started Monitor Type Monitor Make - Model 01/01/1984 SLAMS Teledyne - API 300T 05/24/1990 SLAMS Thermo 42iQ 01/01/1984 SLAMS Teledyne - API 400T 02/01/1988 SLAMS Thermo TEOM 1405-DF 09/01/2005 SLAMS Thermo TEOM 1405-DF 06/13/2000 SLAMS Thermo Partisol 2025 Notes: The same monitor collects PM 10 and PM 2.5 hourly (continuous) measurements. The collocated Partisol 2025 sampler collects a QA filter sample once every 12 days. Method Code PM Monitor Flow Type 093 Not Applicable 074 Not Applicable 087 Not Applicable 208 Low Volume 182 Low Volume FRM FRM FEM FEM Appendix D Requirements - Network Design Criteria Population Population Population Population Exposure Exposure Exposure Exposure NAAQS NAAQS NAAQS NAAQS Comparison Comparison Comparison Comparison FEM 145 Low Volume Size Specific & Sequential FRM PM Monitor Collection Type Not Applicable Not Applicable Not Applicable Dichotomous Dichotomous Highest Concentration NAAQS Comparison Highest Concentration NAAQS Comparison Monitoring Scale (Spatial Scale Represented) Neighborhood Neighborhood Neighborhood Neighborhood Neighborhood Neighborhood Monitoring Season Jan-Dec Jan-Dec Jan-Dec Jan-Dec Jan-Dec Jan-Dec Network Meets Minimum Number of Monitors Required? Yes Yes Yes Yes Yes Yes Method Type (FRM, FEM, ARM) Site Type Basic Monitoring Objective Distance between collocated PM2.5 monitors Distance between PM10 and PM2.5 monitors Appendix E Requirements - Probe and Monitoring Path Siting Criteria Not Applicable Not Applicable Not Applicable 2 meters 2 meters 2 meters Not Applicable Not Applicable Not Applicable 0 meters 0 meters 2 meters Note: The TEOM 1405-DF collects air for both PM 10 and PM 2.5 measurements through the same inlet. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 147 of 204 Probe Height (distance above ground level to inlet) Airflow Arc Probe Sample Line Material Pollutant Sample Residence Time Filter Sample Material Distance from Supporting Structure/Roof (horizontal distance and vertical distance to probe/inlet) Distance from Obstructions on Roof (horizontal distance to obstruction and vertical height of obstruction above probe/inlet) Distance from Obstructions Not on Roof (horizontal distance to the obstruction and vertical height of obstruction above probe/inlet) WEST PHOENIX 4.3 meters 4.3 meters 4.3 meters 5 meters 5 meters 4 meters 360º FEP 6.61 seconds Not Applicable 360º FEP 6.61 seconds Not Applicable 360º FEP 6.61 seconds Not Applicable 360º Not Applicable Not Applicable Not Applicable 360º Not Applicable Not Applicable Not Applicable 360º FEP Not Applicable FEP Horizontal 0 meters 0 meters 0 meters 0 meters 0 meters 0 meters Vertical 2 meters 2 meters 2 meters 0.6 meters 0.6 meters 0.5 meters Horizontal no obstruction no obstruction no obstruction no obstruction no obstruction no obstruction Vertical no obstruction no obstruction no obstruction no obstruction no obstruction no obstruction Horizontal no obstruction no obstruction no obstruction no obstruction no obstruction no obstruction Vertical no obstruction no obstruction no obstruction no obstruction no obstruction no obstruction Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 148 of 204 Distance from Dripline of Closest Tree(s) WEST PHOENIX no tree no tree no tree no tree no tree no tree No Furnace or No Furnace or No Furnace or No Furnace or No Furnace or No Furnace or Flue Flue Flue Flue Flue Flue Nearest Major Roadway Thomas Rd. Thomas Rd. Thomas Rd. Thomas Rd. Thomas Rd. Thomas Rd. Distance and Direction to Road 360 meters, S 360 meters, S 360 meters, S 360 meters, S 360 meters, S 360 meters, S Average Daily Traffic Count 29,000 29,000 29,000 29,000 29,000 29,000 Groundcover Gravel Gravel Gravel Gravel Gravel Gravel Sources: For 1-pt. precision checks, FR verifications, and collocation assessments - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audits - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) Distance to Furnace or Flue Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 149 of 204 ZUNI HILLS County ID: ZH AQS ID: 04-013-4016 Address: 10851 W Williams Rd., Sun City Coordinates: 33.68719 N, -112.29416 W Metropolitan Statistical Area (MSA): 6200 Phoenix-Mesa General Information Pollutant Parameter Code Parameter Occurrence Code Collection Frequency Analysis Method (filter samples only) Any Proposal to Remove or Move Monitor? Does monitor operation meet 40 CFR Part 58, Subpart G – Appendices A, C, D, and E? Is site suitable for comparison to the annual PM2.5 NAAQS as per §58.30? Are Data Comparable to Respective NAAQS? Appendix A Requirements - Quality Assurance Requirements for SLAMS and SPMs Number of 1-Point QC (Precision) Checks Performed in 2020 (Gases) Frequency of 1-Point QC (Precision) Checks Number of Flow Rate Verifications Performed in 2020 (PM) Frequency of Flow Rate Verifications Number of PE Audits Performed in 2020 Dates of PE Audits Annual Precision & PE Audit Reports Submitted to AQS? Date of Annual Data Certification Submission Appendix B Requirements - PSD Monitoring - Not Applicable Appendix C Requirements - Monitoring Methodology Date Sampling Started Monitor Type Monitor Make - Model Method Code PM Monitor Flow Type Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 PM10 81102 1 Continuous Not Applicable No Yes Not Applicable Yes Not Applicable 24 Bi-Weekly 2 03/12/20 07/01/20 Yes 04/30/21 12/01/2009 SLAMS Thermo - TEOM 1405-S 079 Low Volume Page 150 of 204 ZUNI HILLS PM Monitor Collection Type Size Specific Method Type (FRM, FEM, ARM) FEM Appendix D Requirements - Network Design Criteria Site Type Population Exposure Basic Monitoring Objective NAAQS Comparison Monitoring Scale (Spatial Scale Represented) Neighborhood Monitoring Season Jan-Dec Network Meets Minimum Number of Monitors Required? Yes Appendix E Requirements - Probe and Monitoring Path Siting Criteria Distance between collocated samplers Not Applicable Probe Height (distance above ground level to inlet) 3.3 meters Airflow Arc 360º Probe Sample Line Material Not Applicable Pollutant Sample Residence Time Not Applicable Horizontal 0 meters Distance from Supporting Structure/Roof (horizontal distance and vertical distance to probe/inlet) Vertical 1 meters Distance from Obstructions on Roof (horizontal distance to obstruction and vertical Horizontal no obstructions height of obstruction above probe/inlet) Vertical no obstructions Horizontal 6 meters Distance from Obstructions Not on Roof (horizontal distance to the obstruction and vertical height of obstruction above probe/inlet) Vertical 3 meters Distance from Dripline of Closest Tree(s) 9 meters Distance to Furnace or Flue No Furnace or Flue Nearest Major Roadway Williams Rd. Distance and Direction to Road 200 meters, N Average Daily Traffic Count 2,567 Groundcover Lawn / Soil Sources: For 1-pt. precision checks, FR verifications, and collocation assessments - EPA AQS database - 2020 QA DQI Report (AMP256) For PE audits - EPA AQS database - 2020 QA Raw Assessment Report (AMP251) Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 151 of 204 APPENDIX III - 2020 DATA CERTIFICATION DOCUMENTATION Final – 2020 Air Monitoring Network Review and 2021 Plan June 23, 2020 Page 152 of 204 Figure 20 shows the AQS AMP600 Data Certification Report received from EPA R9 with concurrence flags. Final – 2020 Air Monitoring Network Review and 2021 Plan June 23, 2020 Page 153 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 154 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 155 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 156 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 157 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 158 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 159 of 204 Figure 20. 2020 EPA Data Certification Concurrence Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 160 of 204 Figure 21 shows the 2020 AMP 450 non-criteria (NC) data certification report for PM coarse and the SO2 hourly 5-minute maximum received from EPA R9 with concurrence flags. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 161 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 162 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 163 of 204 Figure 21. 2020 Non-Criteria Pollutant Data Certification Report Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 164 of 204 APPENDIX IV - EPA CORRESPONDENCE Final – 2020 Air Monitoring Network Review and 2021 Plan June 23, 2020 Page 165 of 204 Figure 22 shows EPA R9’s letter approving the 2019 Air Monitoring Network and 2021 Plan and checklist used to evaluate it. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 166 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 167 of 204 Final – 2020 Air Monitoring Network Review and 2021 Plan June 23, 2020 Page 168 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 169 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 170 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 171 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 172 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 173 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 174 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 175 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 176 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 177 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 178 of 204 Figure 22. EPA Approval for 2019 Air Monitoring Review and 2020 Plan Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 179 of 204 Figure 23 shows the approval letter for the closure of Diablo site and establishing a new near-road site in the same general location. Final – 2020 Air Monitoring Network Review and 2021 Plan June 23, 2020 Page 180 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 181 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 182 of 204 Final – 2020 Air Monitoring Network Review and 2021 Plan June 23, 2020 Page 183 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 184 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 185 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 186 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 187 of 204 Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 188 of 204 Figure 23. Near-Road Network Changes Approval Letter Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 189 of 204 APPENDIX V - ARIZONA INTERAGENCY CORRESPONDENCE Final – 2020 Air Monitoring Network Review and 2021 Plan June 23, 2020 Page 190 of 204 This section left intentionally blank Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 191 of 204 APPENDIX VI - PUBLIC NOTICE AND COMMENT INFORMATION Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 192 of 204 Figure 24 shows the public comment period announcement, which appeared in The Record Reporter on May 12th and May 19th. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 193 of 204 Figure 24. 2020 Public Comment Period Announcement Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 194 of 204 Public Meeting Attendance Attendance to the virtual open forum meeting was taken by Ceresa Stewart in lieu of a sign-in sheet, and, a list of attendees is shown on Table 27. Table 27. 2020 Open Forum Meeting Attendees Public Comments Received and MCAQD Responses As stated in the announcement, the agenda for the open forum meeting is to provide an opportunity for members of the public and air monitoring community to discuss the County’s air monitoring network. At the meeting, a summary of the 2020 network and NAAQS violations was presented followed by general discussion among attendees about monitoring operations and instrumentation. There were no comments submitted by the public this year. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 195 of 204 APPENDIX VII - GLOSSARY Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 196 of 204 Glossary of Acronyms and Terms ADEQ: Arizona Department of Environmental Quality AADT: annual average daily traffic count aka: Also known as AMD: Air Monitoring Division AMNRP: Air Monitoring Network Review and Plan - an annual report produced for U.S. EPA each calendar year that provides comprehensive information regarding the performance of the County’s air quality surveillance system, e.g., network of SLAMS and SPM monitoring stations and / or sites, and the data collected and reported to EPA. The plan includes proposed future changes to the system as well. Analysis Method Refers to the laboratory method used to process and analyze PM and Pb filter samples. Analyzer: A monitor that samples the air and produces real-time data without collecting a sample that must be laboratory analyzed. ANSI: American National Standards Institute AQI: Air Quality Index - the index that applies to each criteria pollutant and shows the concentration of each pollutant relative to its respective standard. When the AQI reaches 101, the pollutant’s concentration has exceeded the NAAQS. AQS: Air Quality System, sometimes defined as the Air Quality Subsystem. The AQS is the U.S. EPA’s ambient air database. ASQ: American Society for Quality Attainment: Attainment refers to a geographical area as being “in compliance” with a NAAQS and the U.S. Clean Air Act. After several years of no violations of a NAAQS, the U.S. EPA can classify a geographic area as in attainment for a particular CP. AWT: Average Weekday Traffic count BAM: Beta Attenuation Monitor. A continuous particulate measuring instrument used previously by MCAQD to measure PM10. CAA: Clean Air Act CASAC: Clean Air Scientific Advisory Committee CBSA: Core-Based Statistical Area – is defined by the U.S. Office of Management and Budget as a statistical geographic entity consisting of the county or counties associated with at least one urbanized area/urban Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 197 of 204 cluster of at least 10,000 in population, plus adjacent counties having a high degree of social and economic integration. CFR: The Code of Federal Regulations is published annually and contains the codification of the general and permanent rules published in the Federal Register by the executive departments and agencies of the Federal Government. An eCFR is a free electronic version; however, it is not the legal version. Class I Area: Federally designated areas of special national or regional scenic, recreational, or historic value where maximum protection of environmental quality is highest. Class 1 areas are subject to special protection including mandated visibility requirements to prevent significant deterioration. CP: Criteria Pollutant, or the Central Phoenix site, depending upon context CO: Carbon monoxide, a criteria pollutant Collocated: The practice of establishing a second pollutant monitor within a specified distance and of a specified type at a monitoring site for quality assurance purposes. Continuous Monitor: A method of monitoring air pollutants that is continually measuring the quantity of the pollutant, either gaseous or particulate. Continuous monitors are analyzers that can obtain real-time or short-term averages of pollutants. Continuous monitors may also be referred to as “automated” monitors. Criteria Pollutants: Six pollutants (CO, O3, NO2, Pb, PM, and SO2) that have NAAQS established by the U.S. EPA. CSA: Combined Statistical Area - is defined by the U.S. Office of Management and Budget as when very large cities combine two or more CBSAs, these larger areas are referred to as combined statistical areas CSN: The chemical speciation network - a nationwide, research air monitoring network designed to ferret-out the chemical constitutes of and to discern trends in PM2.5 pollution. This program is managed by the U.S. EPA OAQPS. Delta T: The difference between two levels of temperature measurements - Delta T is measured in the MCAQD network at heights of 2 and 10 meters. A higher temperature at the upper level indicates a temperature inversion. Design Value: A design value is a statistic that describes the air quality status of a given area relative to the level of the NAAQS. For a concentration-based standard, the air quality design value is simply the standard-related test statistic. The design value of a pollutant monitoring network is the highest sample value in the network used to compare to the NAAQS; i.e., the 24-hour PM2.5 design value for the network is the monitor with the highest 3-year average of the 98th percentile. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 198 of 204 Distance from Obstructions Not on Roof: Means the horizontal distance and vertical height in meters from obstructions such as trees, walls, etc. that are higher than the sample probe/inlet. Distance from Obstructions on Roof: Means the horizontal distance and vertical height in meters from obstructions on a roof such as a parapets, penthouses, and firewalls to the sample probe/inlet. Distance from Supporting Structure: Means the horizontal distance and vertical height in meters from a building or shelter roof to the sample probe/inlet. A roof supports all monitors; whether it be the roof of a building, trailer (room/shelter), or monitor housing cabinet. EBAM: E-Beta Attenuation Monitor - is a rugged, portable, battery or solaroperated analyzer that is suitable for obtaining and reporting continuous measurements of particulate matter in remote locations. EBAMs are often equipped with wind speed and direction instrumentation as well. EBAMs are particularly useful for temporary measurements of PM related to an event. EPA R9: Environmental Protection Agency Region 9 EE: Exceptional Event – a high CP pollution event that is considered to be uncontrollable and caused by natural sources of pollution or an event that is not expected to recur at a given location. An EE can apply to any CP, but in Maricopa County, most recent EEs have been related to high PM10 events. Event: Generally refers to a high pollution day where a NAAQS was exceeded. Exceedance: Generally refers to a high pollution day where a NAAQS was exceeded. FDMS-TEOM: Filter Dynamics Measurement System-Tapered Element Oscillating Microbalance - a continuous particulate analyzer used by MCAQD to measure PM2.5. FEM: Federal Equivalent Method - an EPA-approved method of sampling and analyzing the ambient air for an air pollutant, i.e., includes the monitor and its operating firmware and procedure(s). An FEM must pass required testing found in 40 CFR Part 53 and show CP data produced are similar to the Federal Reference Method (FRM). Continuous particulate matter and some gaseous analyzers are FEMs. Filter-based sampler: A method of monitoring particulate pollution that involves exposing a pre-weighed filter to a specific flow rate for a prescribed period of time, usually midnight to midnight, or 1440 minutes. The filters are then postweighed to determine the mass of particulates per volume, e.g., µg/m3. Filter samples are stored for a period and can be referenced later if needed. FRM: Federal Reference Method - an EPA-approved method of sampling and/or analyzing the ambient air for an air pollutant, i.e., includes the monitor and its operating firmware and procedure(s). An FRM must pass required testing found in 40 CFR Part 53 and show CP data Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 199 of 204 produced are accurate based on acceptable precision and bias limits. These methods are the baseline that all other methods reference, e.g., Federal Equivalency Methods (FEM). HAPs: Hazardous Air Pollutants - airborne chemicals that are been listed in the federal Clean Air Act and have an associated standard or process requirement determined for it. Sample Probe/Inlet Height: Means the vertical height in meters above the roof, or additional supporting structure on top of the roof if present, to the air sample intake. In general, gas samples enter through a probe at the end of the sample line and PM and Pb samples enter through an inlet that helps control the aerodynamic size of particles sampled. MAG: Maricopa Association of Governments MCAQCED: Maricopa County Air Quality Compliance and Enforcement Division MCAQD: Maricopa County Air Quality Department Metadata: refers to data that provide information about other data; and typically includes geospatial and non-geospatial information. See EPA Metadata Specifications MO: Monitoring organization Monitor: Monitor is a term that refers to an instrument, sampler, analyzer, or other device that measures or assists in the measurement of atmospheric air pollutants and which is acceptable for use in ambient air surveillance under the applicable provisions of 40 CFR Part 58 Appendix C. µg/m3: micrograms per cubic meter µm: micrometers MSA: Metropolitan Statistical Area is designated by the U.S. Office of Management and Budget as a geographical area based on the concept of a core area with a large population nucleus, plus adjacent communities having a high degree of economic and social integration within that core. Metropolitan and micropolitan statistical areas are the two categories of CBSAs. Metropolitan areas have populations greater than 50,000, and micropolitan areas have populations between 10,000 and 50,000. The AMD operates air monitoring stations within the Phoenix-Mesa MSA, which includes portions of Maricopa and Pinal County. NAAQS: National Ambient Air Quality Standards - health and welfare-based standards established by the U.S. EPA that set permissible airborne concentration levels for the CPs. NATTS: National Air Toxics Trend Stations - a nationwide, research air monitoring program designed to measure toxic air pollutant trends. This program is managed by the U.S. EPA OAQPS. NCore: National Core multi-pollutant is a national network of multi-pollutant monitoring sites used to represent the nation as a whole. There are Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 200 of 204 currently ~75 NCore sites, 1 to 3 per state plus Washington D.C., Virgin Islands, and Puerto Rico located in both urban and rural areas. This program is managed by the U.S. EPA OAQPS. Network: All stations of a given type or types NO2: Nitrogen dioxide. The indicator compound used to gauge the ambient concentration of NOx. NOX: Nitrogen oxide(s), a criteria pollutant. NOx is the sum of nitric oxide (NO), NO2, and other nitrogen-containing compounds. Nonattainment: Means a geographical area is “not in compliance” with the NAAQS and the U.S. Clean Air Act. After several years of violating a NAAQS, the EPA can classify a geographic area as being in nonattainment for a particular criteria pollutant. O3: Ozone, a criteria pollutant OAQPS: The U.S. EPA Office of Air Quality Planning and Standards, located in Research Triangle Park, N.C., which serves as EPA “Headquarters” for ambient air monitoring guidance and the NAAQS reviews. PAMS: Photochemical Ambient Monitoring Stations - a nationwide, research air monitoring program designed to measure specific airborne chemicals that are known to be “precursor pollutants” that form ozone when combined with ultraviolet light and heat. This program is managed by the U.S. EPA OAQPS. PCAQCD: Pinal County Air Quality Control District Pb: Lead, a criteria pollutant Performance Evaluation (PE) Audit: Refers to the AMD QA section’s audits on pollutant monitors. • For gaseous analyzers, the EPA requires that an Annual Performance Evaluation be performed on each analyzer at least once annually, e.g., as per 40 CFR Part 58, Appendix A, §3.2.2., 25 percent of the monitors operating within each gaseous pollutant’s network are evaluated quarterly; thereby, each monitor is evaluated once per year. • For PM and Pb monitors, e.g., analyzers and samplers, EPA requires that a Semi-Annual Flow Rate Audit be performed on each monitor at least twice annually, e.g., as per 40 CFR Part 58, Appendix A, §§3.2.4 and 3.3.4, and 40 CFR Part 58, Appendix A, §3.4, respectively. Particulate matter, also known as “particulates”, project manager, or preventative maintenance depending on context PM: PM2.5: Particulate matter 2.5 micrometers in aerometric diameter or smaller, a criteria pollutant. PM2.5 is also referred to as “fine” particulate matter. PM10: Particulate matter 10 micrometers in aerometric diameter or smaller, a criteria pollutant Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 201 of 204 PM10-2.5 and / or PMc: “Coarse” particulate matter is less than 10 micrometers, but recently, has come to mean PM10 minus PM2.5, not currently regulated as a lone criteria pollutant. ppb: parts per billion ppm: parts per million PQAO: Primary quality assurance organization - a monitoring organization (MO) or other organization that is responsible for a set of air monitoring stations that monitor the same pollutant and for which data quality assessments can be pooled. Each criteria pollutant sampler/monitor at a monitoring station in the SLAMS and SPM networks must be associated with one, and only one, primary quality assurance organization. Primary Standard: The portion of the NAAQS designed to protect public health. Probe: The end of a sample line where a gas sample is extracted from the atmosphere for delivery to a point analyzer for pollutant analysis Probe/Inlet Height: The vertical height in meters above ground level to the air sample intake location for an analyzer or sampler Probe (Sample) Line Material: Refers to the chemical composition of the sample line tubbing. QA: Quality assurance – generally refers to the administrative or managerial processes in place to verify that quality control activities are successfully carried out by personnel and that data produced meet specified quality requirements prior to use, i.e., written guidance documents, program oversight activities, etc. QC: Quality control – generally refers to the technical activities in place to produce high quality data, i.e., air monitoring instruments operate within specified criteria, data collection from sites, etc. Quality System: The overall system of technical activities that measure the attributes and performance of a process, item, or service against defined standards to verify that they meet the stated requirements established by the customer. (see ANSI/ASQ E4-2004) RRNS: Rapid Response Notification System - a communication tool used by MCAQD to manage high pollution events by alerting residents, intergovernmental personnel, and stakeholders of increasing PM concentrations. Sampler: A type of air monitor that collects a physical sample for analysis. Air samples may be collected onto a filter, cartridge, or other medium, or into a device such as a canister. Sample Residence Time: This measurement applies to CO, NO2, O3 , and SO2 sample lines and it mean the amount of time in seconds that it takes for a sample of air to travel from the probe intake to the bulkhead of the point analyzer. EPA Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 202 of 204 recommends a residence time of 10 seconds, but 20 second is the maximum allowable. Secondary Standard: The portion of the NAAQS designed to protect public welfare and the environment. SIP: State Implementation Plan - a SIP is a plan produced by state and/or local regulatory agencies that specifies obligations that will be taken for a geographic area in nonattainment to meet the NAAQS for a criteria pollutant. SIPs are also developed for maintaining compliance with the NAAQS. Site: A site is a geographic location. One or more air monitoring stations can be located at a site. SLAMS: State and Local Air Monitoring Station - the SLAMS network consists of approximately 5,000 monitoring stations nationwide whose size and distribution is largely determined by the needs of State and local air pollution control agencies to meet their respective SIP requirements. Other types of monitoring stations include: NCore (national core) and SPM (special purpose). Currently, the AMD operates SLAMS only. SO2: Sulfur dioxide, a criteria pollutant SPM: Special Purpose Monitor - a special purpose monitor provides data for special studies needed by the State and local agencies to support SIPs and other air program activities. The SPMs are not permanently established as part of a particular pollutant’s monitoring station(s); their location can be adjusted easily to accommodate changing needs and priorities. SSI: Size Selective Inlet - the inlet used on high- and low-volume particulate samplers and analyzers to determine the size of particles sampled or measured by the monitor. The particle size separation process usually employs impaction, filtration, or cyclonic flow. Station: A station may comprise a single CP monitor, or a group of monitors with a shared objective, located at a particular site. TEOM: Tapered Element Oscillating Microbalance - an automated, continuous FEM PM analyzer used by MCAQD to measure PM10 and/or PM2.5 concentrations, depending upon the instrument model and air sample inlet configuration(s). tpy: tons per year UATMP: Urban Air Toxics Monitoring Program - a nationwide research air monitoring program designed to measure toxic air pollutants within urban areas. This program is managed by the U.S. EPA OAQPS. U.S. EPA: United States Environmental Protection Agency Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 203 of 204 VOC: Volume: Volatile Organic Compound - VOCs are chemical compounds that can easily vaporize and enter the atmosphere. There are many natural and artificial sources of VOCs; solvents and gasoline make up some of the largest artificial sources. VOCs will react with NOx in the presence of sunlight to create ground-level O3 pollution. a. The amount of air sampled for analysis. Volume is calculated by multiplying a monitor’s flowrate by the collection time, usually in minutes. Volume = flowrate X minutes b. The amount of data in a file or database. Final – 2020 Air Monitoring Network and 2021 Plan June 23, 2021 Page 204 of 204