2015
Ambient Air Monitoring Network Plan

Pima County Department of Environmental Quality
33 North Stone, Suite 700
Tucson, Arizona 85701
AQ 391

2015 Ambient Air Monitoring
Network Plan
Pima County Board of Supervisors
Ally Miller
Ramón Valadez
Sharon Bronson
Raymond Carroll
Richard Elías

Pima County Administrator
Charles H. Huckelberry

Pima County Department of Environmental Quality
Ursula Nelson
Director
Richard Grimaldi
Deputy Director
Air Quality Technical Operations
Ted Gould
Program Manager

Data Collection Group
Data Management Group
Jim McDonnell, Principal Instrumentation Technician
Deborah Jentoft, Data Manager
Trinidad Alvarez, Senior Instrumentation & Control Specialist
Victor Malkin, Program Specialist
Quality Assurance Group
Mike Draper, Data Collection Supervisor

TABLE OF CONTENTS
I. INTRODUCTION
Network improvements and anticipated modifications...…………………
II. BACKGROUND
Regional Evaluation………………………………………………………
Average Daily Traffic (ADT)…………………………………………….
Local Geography and Meteorology………………………………………
Definition of Monitoring objective, site types and spatial scales…………
Eastern Pima County, Tucson air planning area map……………………..
III. MONITORING SITES SUMMARY AND MAP
Active particulate monitoring sites for 2015…………………………… ...
Active gaseous monitoring sites for 2015………………………………...
PDEQ Ambient Air Monitoring site location map………………………..
Monitoring network descriptive summary tables 2015….………………..
IV. CURRENT MONITORING NETWORK EVALUATIONS
PM 10 Monitoring Network Requirements ……………………..………………………………
PM 2.5 Monitoring Network Requirements ……………………………………………………...
PM 10 -PM 2.5 Monitoring Network Requirements …..………………………………………
O 3 Monitoring Network Requirements …………….……………………………………………
CO Monitoring Network Requirements ………………………………………………………
NO 2 Monitoring Network Requirements …………………………………………………….
NO y Monitoring Network Requirements ………………………………..……………………
SO 2 Monitoring Network Requirements ……………………………………………………….
Lead Monitoring Network Requirements …………………………………………………….
V. DETAILED SITE AND MONITOR INFORMATION

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LIST OF FIGURES / TABLES
FIGURES
1.
2.
TABLES
1.
2.
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7.
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23.
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30.

Eastern Pima County, Tucson Air Planning Area map………………………
PDEQ Ambient Air monitoring site location map….………………………..

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12

Relationship between Monitoring site type and spatial scale
represented……………………………………………………………….…..
Active particulate monitoring sites for 2015…………………………………
Active gaseous monitoring sites for 2015…………………………………….
Monitoring Network Descriptive Summary Tables…………………………..
2015 PM 10 Design Criteria……………………………………………………
PM 10 Precision and Accuracy Summary Table……………………………….
Collocated PM 10 Monitors …………………………………………………...
PM 10 Annual Summary Statistics ……………………………………………
2015 PM 2.5 Design Criteria……………………………………………………
Collocated PM 2.5 Monitors ……………………………………………………
PM 2.5 Precision and Accuracy Summary Table……………………………….
PM 2.5 Annual Summary Statistics…………………………………………….
PM 10 - PM 2.5 Annual Summary Statistics……………………………………..
2015 Ozone Design Criteria…………………………………………………..
Ozone Audit Dates 2015………………………………………………………
Ozone Annual Summary Statistics ……………………………………………
2015 Carbon Monoxide Design Criteria ………………………………………
CO Audit Dates 2015……….………………………………………………....
CO Annual Summary Statistics………………………………………………..
2015 Nitrogen Dioxide Design Criteria ………………………………………
Nitrogen Dioxide Audit Dates 2013 …………………………………………..
NO 2 Annual Summary Statistics ……………………………………………….
NO y Audit Dates 2015 ………………………………………………………..
NO y Annual Summary Statistics………………………………………………
2015 Sulfur Dioxide Design Criteria ………………………………………….
Sulfur Dioxide Audit Dates 2015 ……………………………………………..
SO 2 Annual Summary Statistics ……………………………………………….
2015 Lead Design Criteria ……………………………………………………..
Lead Precision and Accuracy Summary Table ………………………………..
Lead Annual Summary Statistics ………………………………………………

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2015 Ambient Air Monitoring Network Plan

I. INTRODUCTION

This document constitutes the 2015 Ambient Air Monitoring Network Plan for the Pima County air
monitoring network. The Pima County Department of Environmental Quality (PDEQ) has prepared
this document to be submitted to the U.S. Environmental Protection Agency (USEPA), Region IX.
The purpose of the Ambient Air Monitoring Network Plan is to determine if the network is
achieving the air monitoring objectives specified in 40 CFR Part 58 Appendix D, which mandate
adherence to certain number, type and location requirements of monitoring sites and specific site
criteria such as monitoring inlet height. The review should also determine if modifications should be
made to the network (e.g. through the termination or relocation of unnecessary stations or addition of
new stations). In addition, the review is necessary in order to ensure that the residents of Pima
County are provided adequate, representative and useful air quality data, and to provide adequate
protection to public health.
The designated ambient air pollutants monitored and reported by PDEQ are carbon monoxide (CO),
ozone (O 3 ), nitrogen dioxide (NO 2 ), sulfur dioxide (SO 2 ), lead (Pb), particulate matter with an
aerodynamic diameter of 10 micrometers or less in size (PM 10 ) and particulate matter with
aerodynamic diameter of 2.5 micrometers or less in size (PM 2.5 ). This pollutant data is submitted to
the EPA Air Quality System (AQS) database for determination of compliance with National
Ambient Air Quality Standards (NAAQS). This report contains statistical data summaries for the
2015 calendar year and provides a site by site assessment of the monitoring network with respect to
EPA site criteria.
The Pima County monitoring network includes both State or Local Air Monitoring Stations
(SLAMS) and Special Purpose monitors (SP). SLAMS monitors comprise the required network
monitors that are used for NAAQS comparisons and follow the monitoring objectives listed on page
6. SP monitors are used to conduct special purpose studies and to enhance the network coverage of
air quality monitoring data.
Pima County has a designated National Core (NCore) site at the Children’s Park location, which also
monitors for reactive oxides of nitrogen (NO Y ), particulate matter, coarse fraction (PM 10-2.5 ),
speciated PM 2.5 particulate matter and lead.
Pima County does not share monitoring responsibilities with Arizona Department of Environmental
Quality at this time.
Schedule of EPA’s review of criteria pollutants:
October, 2015 – EPA final rule of ozone standard
March, 2015 – EPA draft assessment of Sulfur Dioxide and secondary Nitrogen Dioxide

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2015 Ambient Air Monitoring Network Plan

PDEQ made the following network modifications in 2015:
Installed R & P 2000 at Santa Clara to meet method designation collocation requirements.
Collocated data reporting to begin January 1, 2016.
Attachment A includes the approval letter of changes requested in 2014.
PDEQ’s anticipated network modifications in 2016:
Based on the 2014 EPA Technical System Audit findings, PDEQ will make the following changes,
effective January, 2016:
Re-Classify PM 10 stations from Special Purpose to SLAMS
• Geronimo, Santa Clara, Green Valley and Tangerine
Re-Classify PM 2.5 stations from Special Purpose to OTHER
• Geronimo, Green Valley, Rose Elementary and Coachline
Also based on the 2014 EPA Technical System Audit findings, PDEQ is requesting approval for a
classification change from Special Purpose to SLAMS for the following monitors / stations:
•
•
•

Carbon Monoxide / Children’s Park NCore
Nitrogen Dioxide / Children’s Park NCore
Ozone / Green Valley, Tangerine, Rose Elementary, Coachline and Fairgrounds

PDEQ will continue impact analysis of development near the Tangerine ozone and PM 10 monitoring
station, and if necessary change the station spatial scale and site type to correspond with changes to
area development.
Due to continued decreasing ambient concentrations and changes to the NAAQS, PDEQ will also
change operating ranges on nitrogen dioxide and ozone analyzers to reflect current recommendations
for upper range, quality control checks, and span check levels. The nitrogen dioxide analyzer at the
22/Craycroft monitoring station will be changed from a 500ppb range to a 200 ppb range,
duplicating the ranges of the nitrogen dioxide and NOy analyzers at the Children’s Park NCore
station. Ozone analyzers network-wide will undergo changes to operating range, span check and
calibration points, as well as one-point QC checks, following recommendations in the QA
Handbook, Volume II, Section 10, to levels as practicable as real-world commercially available
calibration instrumentation will allow, with a reasonable degree of accuracy at the lower calibration
levels.
Pima County DEQ is requesting to discontinue monitoring of non-source oriented lead at the
Children’s Park location. Attachement B contains the letter requesting this change and the approval
letter from EPA.

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2015 Ambient Air Monitoring Network Plan

Near-Road Monitoring
Integral to revised minimum monitoring requirements for nitrogen dioxide (NO 2 ) promulgated in
February, 2010, state and local air monitoring agencies are required to install near-road NO 2
monitoring stations at locations where peak hourly NO 2 concentrations are expected to occur within
the near-road environment in larger urban areas. Implementation of this requirement involves a
three-tiered approach, with initial installations in areas with populations greater than 1,000,000 to be
completed by January 1, 2014. The second tier requires areas with 1) populations greater than
2,500,000 or, 2) populations greater than 500,000 with one or more roadway segments having
250,000 or greater Average Daily Traffic count to be completed by January 1, 2015. The third tier
requires areas with populations greater than 500,000 but less than 1,000,000 to complete installations
by January 1, 2017.
With most installations of Tier I and II monitoring stations complete, and sufficient NO 2 data
reported to ascertain with some certainty the concentration levels of NO 2 in the near-road
environment, it has been determined that measured NO 2 levels are lower than expected, and in some
cases, lower than neighborhood locations in the same urban areas. In light of this information, the
logical course of action is to cancel installations of Tier III monitoring stations, which is what US
EPA is proposing.
Population figures for tier placement were based on the 2010 census, and Pima County, being under
the 1,000,000 mark, was slated for Tier III implementation, due January 1, 2017. Site selection and
installation logistics were in progress when PDEQ was informed of the likely cancellation of the
Tier III requirement, so all planning was put on hold. Several months later, PDEQ was informed that
based on the most recent population data for Pima County, derived from 2014 estimates, the
population had exceeded one million, and had increased to 1,004,516. This inconvenient estimation
places Pima County in the Tier I category, which requires installation of a near-road NO 2 station,
regardless of the logic presented in the previous paragraph.
This situation presents an interesting regulatory conundrum. With installation costs in Tucson
expected to exceed $100,000, should the codified requirement, based on an estimate, supersede the
reality of lower than expected measurable outcome already established in urban areas much larger
than Tucson? If concentration levels in those areas are lower than expected, it does not make sense
to install the same type of monitoring station in a smaller urban area with lower traffic counts.
To further complicate the issue, Pima County has the dubious distinction of being the first urban area
to cross over a population demarcation into a different Tier requirement during the course of the
implementation phases, and no implementation guidance has been established for this precedent.
Considering the circumstances of this situation, PDEQ questions the validity of basing this
requirement on a population estimate, and will continue suspension of all planning activities for a
near-road NO 2 monitoring station, pending further consideration by US EPA.

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2015 Ambient Air Monitoring Network Plan

General comment regarding monitoring station siting criteria:
The locations of monitoring stations in the PDEQ network require considerable planning to conform
to all of the siting requirements specified in 40 CFR 58 Appendix E. Locations are chosen only after
carefully considering the intent and installation logistics of each station. Some stations remain static,
and easily maintain all siting criteria, and others fall victim to urban evolution and nature.
Development happens and trees grow, modifying the original circumstances. Development can
change those circumstances to the point that relocation or designation change of a station is required.
Tree growth is more forgivable in that it can be modified by removal or trimming, but sometimes
this is not possible for a number of reasons. Going to the effort of relocating a station because of tree
growth is not generally practical. Modifying the station information to categorize trees as an
obstruction is preferable, as long as siting criteria still meets the minimum requirements for
obstructions. Most of the trees near PDEQ monitoring stations are typical of Sonoran Desert
indigenous species, namely mesquite and palo verde, both of which have small, relatively sparse
leaves, and in most cases do not totally block airflow, or provide large surfaces for particulate
deposition. However, PDEQ has several stations that have been compromised by substantial tree
growth, and in each section for those stations, the category for degrees of unrestricted airflow will
reflect the reality of tree growth at those stations, and the obstructed airflow will be identified by
direction in degrees.

II. BACKGROUND
Pima County Air Quality Control District met all the National Ambient Air Quality Standards
(NAAQS) in 2015. Concentrations of the criteria pollutants have been stable over the past few years
with ozone and particulate matter (PM 10 ) being the major concern for Pima County. Ozone has been
very close to the standard, often within 95% of the standard. Particulate matter (PM 10 ) levels are
elevated during drought conditions and high winds which have caused exceedances of the NAAQS.
Regional Evaluation
In order to evaluate existing and proposed monitoring stations and their stated objectives, regional
information is used. The regional information consists of the most current values for population,
major urban developments and directions of growth, traffic and highway data, major industries and
aerial photographs showing topography. Population (census tract) data can act as a guide in
evaluation of the representativeness of a site for determining population exposure. The 2010 census
shows Pima County population at 980,263 and the city of Tucson population at 520,116. Figure 1
on page 8 illustrates the Eastern Pima County Tucson Air Planning Area (TAPA). The various
incorporated areas and other agency lands are shown, as well as the named mountain peaks that
define the planning area for Eastern Pima County, which includes the Tucson Metropolitan area. The
Tucson Metropolitan Statistical Area( MSA) has incurred a population increase of approximately
2.5% since the 2010 census, based on 2014 estimates by the US Census Bureau.
Average Daily Traffic (ADT)
Traffic data is necessary for site evaluations since a large portion of air pollutants in the Tucson
basin are caused by vehicular traffic. Traffic volumes and density maps are used in evaluating the
monitoring network. This data is routinely compiled and used by local transportation and planning
agencies. An analysis of the most current traffic data indicates that the network continues to meet
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2015 Ambient Air Monitoring Network Plan

the requirements for the monitoring site type and corresponding spatial scales as initially established.
The Average Daily Traffic (ADT) numbers are 24 - hour, two - way volume of averaged weekday
traffic.
Latitude and Longitude
Latitude and Longitude data is also provided for the monitoring sites using Datum WGS84 AZ
Central in Decimal.Degrees.
Local Geography and Meteorology
Tucson, Arizona is a major metropolitan area situated in the Santa Cruz river valley, which is
encompassed by the Sonoran Desert at an elevation between 2300 and 2800 feet. Basin and range
topography characterizes the region with rugged mountain ranges encircling the valley floor with
mountain peak elevations in excess of 9000 feet, thus delineating the Tucson Air Planning Area. The
flat or gently rolling valley terrain slopes from the higher south and southeast toward the lower
northwest following the Santa Cruz river drainage.
The climate of Tucson is characterized by a hot season normally starting in April and ending in
October, and a generally mild winter. Maximum daily temperatures from May through September
are usually above 90 degrees Fahrenheit. The average rainfall is around eleven inches per year.
Tucson International Airport records show an average of 240 clear days a year (days with less than
50% total cloud cover). The remaining periods include the winter prefrontal situations more common
in the north and the prolonged seasons of convective summer storms. Wind velocity and direction
changes, associated with the large scale pressure systems, frequently result in localized dust storms.
The mountain-valley circulation, along with surface heating during the day and radiational cooling at
night, create a predominantly southeast to northwest wind path in the basin. Airflows generally tend
to be downvalley (from the southeast) at night and early morning hours, reversing to the upvalley
direction (from the northwest) during the day. These downvalley / upvalley flows are strongly
influenced by localized upslope / downslope terrain. The normal upvalley airflow is from the
northwest, and parallels the Santa Cruz River, but decays well before sunset. This is followed by an
hour of light, erratic flows which turn into the downvalley flow from the southeast, and reach their
maximum and stabilized speed in four to six hours. The air temperature drops steadily during this
interval until the sun rises. The downvalley direction continues for two to five hours past sunrise
and then transforms into a short calm period prior to the change to upvalley flows.
The southeasterly “monsoon” regime that occurs primarily in the months of July and August is a
large scale synoptic feature with considerable yearly variation both in intensity and timing. At the
Tucson International Airport, the winds become strong, gusty and southeasterly with high relative
humidity, cloud cover and frequent thunderstorms. The mountain – valley circulation tends to be
suppressed during this time period.
Atmospheric temperature inversions occur almost daily in the Tucson air basin. During the winter
months these inversions may become severe with particulate and other pollutants becoming
concentrated, remaining near the ground level causing haze. When the sun sets, the ground and
surface air cools faster than the air several hundred feet above the surface. Since air temperature
normally decreases with increasing altitude, the warm and cool layers are reversed or “inverted”,
hence the name ‘temperature inversion’. These temperature inversions are usually strongest on cold,
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2015 Ambient Air Monitoring Network Plan

clear winter nights, where there is an absence of cloud cover. Consequently, the inversions “lock”
the pollutants near the surface. As the sun causes the cool air layer close to the ground to warm up,
vertical mixing and horizontal transport disperse the air pollutants. In the early evening, the low
level air inversion begins to form again and often coincides with the evening traffic rush hour.
Definition of Monitoring Objectives, Site Types and Spatial Scales
The Pima County ambient air monitoring network is designed to meet three basic monitoring
objectives. These objectives listed in Appendix D, 1.1 of 40 CFR Part 58 are:
♦ To provide air pollution data to the general public in a timely manner;
♦ To comply with ambient air quality protocols and standards in order for data to be used for
comparison to the NAAQS;
♦ To support research studies.
The monitoring stations which comprise the Pima County network are designed to meet at least one
of six basic monitoring site types. As listed in Appendix D, 1.1.1 of 40 CFR Part 58, the site types:
♦
♦
♦
♦
♦
♦

Determine the area of highest concentrations expected to occur in the network;
Determine representative concentrations in areas of high population density;
Determine the impact on ambient pollution levels of significant sources or source categories;
Determine general background concentration levels;
Determine the extent of regional pollution transport among populated areas;
Determine the welfare – related impact in more rural and remote areas.

The link between general monitoring objectives, site types and the geographical location of a
monitoring station is defined as the spatial scale of representativeness, and the relationship is
indicated in Table 1 (next page). The goal of each station is to represent a specific air parcel
throughout which actual pollution concentrations are reasonably homogeneous. The spatial
scales are defined in Appendix D, 1.2 of 40 CFR Part 58 as follows:
♦ Microscale defines concentrations in air volumes associated with area dimensions from 1
meter to 100 meters;
♦ Middle Scale defines concentrations typical of areas from 100 meters to 500 meters;
♦ Neighborhood Scale defines concentrations typical of areas with dimensions in the 0.5 to 4.0
kilometer range;
♦ Urban Scale defines the overall, city – wide conditions with dimensions in the 4 to 50
kilometer range;
♦ Regional Scale usually defines a rural area with dimensions as much as hundreds of
kilometers;
♦ National and Global Scales represent concentrations which characterize nations and the
globe as a whole (Pima County does not employ stations under this category).

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2015 Ambient Air Monitoring Network Plan

Table 1
Monitoring Site Types
Highest Concentration
Population
Source Impact
General / Background
Regional Transport
Welfare-Related Impacts

Appropriate Spatial Scales
Micro, Middle, Neighborhood, sometimes Urban
Neighborhood, Urban
Micro, Middle, Neighborhood
Urban, Regional
Urban, Regional
Urban, Regional

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2015 Ambient Air Monitoring Network Plan

Figure 1

2015 Ambient Air Monitoring Network Plan

III. PIMA COUNTY AIR QUALITY MONITORING NETWORK
SUMMARY TABLES AND MAP

Active Particulate and Lead Monitoring Sites for 2015

Table 2
Map # Pollutant

Site Name

2498 N. Geronimo

Geronimo

4

PM 10

5

PM 10

1601 S. 6th Ave.

South Tucson

8

PM 10

22000 S. Houghton Rd.

9

PM 10

6910 S. Santa Clara Ave.

10

PM 10

Corona de
Tucson
Santa Clara
School
Green Valley

11

PM 2.5

Address

PM 2.5
PM 2.5

12

PM 10

13

PM 10

PM 2.5

601 N. La Canada Dr.
Pb

400 W. River Rd.
3401 W. Orange Grove Rd.

Children’s Park
NCore
Orange Grove

12101 N. Camino de Oeste

Tangerine
Rose
Elementary
Coachline

14

PM 2.5

710 W. Michigan

15

PM 2.5

9597 N. Coachline Blvd.
Map located on Page 12

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2015 Ambient Air Monitoring Network Plan

Active Gaseous Pollutant Monitoring Sites for 2015

Map # Pollutant
2

CO

3

CO

10
11

O3

NO 2

O3
CO

O3

SO 2

NO 2

NO Y

Table 3
Address

Site Name

1237 S. Beverly Ave.

22nd & Craycroft

3895 E. 22nd St.

22nd & Alvernon

601 N. La Canada Dr.

Green Valley

400 W. River Rd.

Children’s Park NCore

13

O3

12101 N. Camino de Oeste

Tangerine

14

O3

710 W. Michigan

Rose Elementary

15

O3

9597 N. Coachline Blvd.

Coachline

2745 N. Cherry Ave.

Cherry & Glenn

16

CO

17

O3

11330 S. Houghton Rd.

Fairgrounds

18

O3

3905 S. Old Spanish Trail

Saguaro National Park,
East
Golf Links & Kolb

23

CO

2601 S. Kolb Rd.
Map located on page 12

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2015 Ambient Air Monitoring Network Plan

2015 Ambient Air Monitoring Network Plan

2015 Ambient Air Monitoring Network Summary Table
Table 4
CARBON MONOXIDE - PIMA COUNTY MONITORING NETWORK
SITE NAME AND LOCATION SITE ID (a) PARAMETER
(b)
22ND & CRAYCROFT

04-019-1011

42101

CLASSIFICATION
(c)

DATES
(d)

SLAMS

Jul-73

04-019-1014

42101

SLAMS

04-019-1028

42101

SP

SMPL
FREQ (i)

POC (j) MONITORING
SITE TYPE (h)

158

2582

4.1

NEIGHBORHOOD

CONTINUOUS

1

POPULATION EXPOSURE

Mar-75

174/054

2516

3.4

MICROSCALE

CONTINUOUS

1

HIGHEST CONCENTRATION

Oct-98

554

2286

4.25

NEIGHBORHOOD

CONTINUOUS

1

POPULATION EXPOSURE

54

2400

4.9

NEIGHBORHOOD

Cont/Seasonal

1

POPULATION EXPOSURE

1

HIGHEST CONCENTRATION

PRESENT

400 W. RIVER ROAD
CHERRY & GLENN

SPATIAL
SCALE (h)

PRESENT

3895 E.22ND STREET
CHILDREN'S PARK NCore

ELEV.
SMPL
FEET (f) HEIGHT
(M) (g)

PRESENT

1237 S. BEVERLY AVE.
22ND & ALVERNON

METHOD
(e)

04-019-1021

42101

SP

Feb-89
PRESENT

2745 N. CHERRY AVE.

Jan. 1 –March31
Oct. 1- Dec. 31

GOLF LINKS & KOLB

04-019-1031

42101

SP

Sept-02

54

2661

3

MICROSCALE

PRESENT

2601 SOUTH KOLB

Cont/Seasonal
Jan. 1 –March31
Oct. 1- Dec. 31

NITROGEN DIOXIDE - PIMA COUNTY MONITORING NETWORK
SITE NAME AND LOCATION SITE ID (a) PARAMETER
(b)
22ND & CRAYCROFT

04-019-1011

42602

CLASSIFICATION
(c)

DATES
(d)

SLAMS

Jan-73

ELEV.
SMPL
SPATIAL
FEET (f) HEIGHT SCALE (h)
(M) (g)

SMPL
FREQ (i)

POC (j) MONITORING
SITE TYPE (h)

157

2582

4.1

NEIGHBORHOOD

CONTINUOUS

1

POPULATION EXPOSURE

090

2286

4.25

NEIGHBORHOOD

CONTINUOUS

1

HIGHEST CONCENTRATION

PRESENT

1237 S. BEVERLY AVE.
CHILDREN'S PARK NCore

METHOD
(e)

04-019-1028

42602

SP

May-98
PRESENT

400 W. RIVER ROAD

REACTIVE OXIDES OF NITROGEN - PIMA COUNTY MONITORING NETWORK
CHILDREN'S PARK NCore
400 W. RIVER ROAD

04-019-1028

42600

SLAMS

Oct-10

674

PRESENT

Key located on page 16

13

2286

10.0

NEIGHBORHOOD

CONTINUOUS

1

POPULATION EXPOSURE

2015 Ambient Air Monitoring Network Plan

2015 Ambient Air Monitoring Network Summary Table
SULFUR DIOXIDE -PIMA COUNTY MONITORING NETWORK
SITE NAME AND LOCATION

SITE ID (a) PARAMETER CLASSI(b)
FICATION
(c)

DATES
(d)

CHILDREN'S PARK NCore

04-019-1028

Oct-10

42401

SLAMS

METHOD (e) ELEV. SMPL
FEET (f) HEIGHT
(M) (g)
560

2286

4.25

SPATIAL
SCALE (h)

SMPL
FREQ (i)

NEIGHBORHOOD CONTINUOUS

POC (j) MONITORING
SITE TYPE (h)

1

POPULATION EXPOSURE

PRESENT

400 W. RIVER ROAD

OZONE -PIMA COUNTY MONITORING NETWORK
SITE NAME AND LOCATION

SITE ID (a) PARAMETER CLASSI(b)
FICATION
(c)

22ND & CRAYCROFT

04-019-1011

44201

SLAMS

04-019-1030

44201

SP

04-019-1028

44201

SLAMS

04-019-1018

44201

SP

04-019-1032

44201

SP

04-019-1034

44201

SP

04-019-1020

44201

SP

3905 S. OLD SPANISH TRAIL

4.1

NEIGHBORHOOD CONTINUOUS

1

POPULATION EXPOSURE

July-03

047

2910

3.1

NEIGHBORHOOD CONTINUOUS

1

POPULATION EXPOSURE

Sep-97

047

2286

4.25

NEIGHBORHOOD CONTINUOUS

1

POPULATION EXPOSURE

Oct-89

047

2638

3.75

URBAN

CONTINUOUS

1

HIGHEST CONCENTRATION

July-03

047

2387

4.1

NEIGHBORHOOD CONTINUOUS

1

POPULATION EXPOSURE

July-03

047

2110

3.1

NEIGHBORHOOD CONTINUOUS

1

POPULATION EXPOSURE

Oct-89

047

3078

3.6

URBAN

CONTINUOUS

1

BACKGROUND

047

3089

4.1

NEIGHBORHOOD CONTINUOUS

1

HIGHEST CONCENTRATION

PRESENT

11330 S. HOUGHTON RD.
SAGUARO NATIONAL PARK

2582

PRESENT

9597 N. COACHLINE BLVD
FAIRGROUNDS

047

PRESENT

710 W. MICHIGAN
COACHLINE

POC (j) MONITORING
SITE TYPE (h)

PRESENT

12101 N. CAMINO DE OESTE
ROSE ELEMENTARY

SMPL
FREQ (i)

PRESENT

400 W. RIVER ROAD
TANGERINE

SPATIAL
SCALE (h)

PRESENT

601 N. LA CANADA DR.
CHILDREN'S PARK NCore

Jul-73

METHOD (e) ELEV. SMPL
FEET (f) HEIGHT
(M) (g)

PRESENT

1237 S. BEVERLY AVE.
GREEN VALLEY

DATES
(d)

04-019-0021

44201

SLAMS

Jun-82
PRESENT

Key located on page 16

14

2015 Ambient Air Monitoring Network Plan

2015 Ambient Air Monitoring Network Summary Table
PM10- PIMA COUNTY MONITORING NETWORK
SITE NAME AND LOCATION

SITE ID (a) PARAMETER
(b)

CLASSI- DATES (d)
FICATION
(c)

GERONIMO

04-019-1113

SP

81102

04-019-1001

81102

SLAMS

1601 S. 6TH AVE.
CORONA DE TUCSON

04-019-0008

81102

SLAMS

04-019-1026

81102

SP

04-019-1030

81102

SP

04-019-0011

81102

SLAMS

3401 W. ORANGE GROVE RD.
TANGERINE

122

2452

4.6

NEIGHBORHOOD

CONTINUOUS

1

POPULATION EXPOSURE

Sep-88

127

2420

6.9

NEIGHBORHOOD

1 DAY

1

POPULATION EXPOSURE

PRESENT

127

collocated
every 6 day

2

Mar-87

126

3078

2.1

REGIONAL

6 DAY

1

BACKGROUND

126

2540

6.45

NEIGHBORHOOD

6 DAY

1

POPULATION EXPOSURE

079/122

2910

4.25

NEIGHBORHOOD

CONTINUOUS

1

POPULATION EXPOSURE

2234

2.65

NEIGHBORHOOD

1 DAY

2

HIGHEST CONCENTRATION

collocated
every 6 day

4

6 DAY

1

BACKGROUND

1

POPULATION EXPOSURE

Jul-94

Feb-01
PRESENT

601 N. LA CANADA DR.
ORANGE GROVE

POC (j) MONITORING
SITE TYPE (h)

PRESENT

6910 S. SANTA CLARA AVE.
GREEN VALLEY

SMPL
FREQ (i)

PRESENT

22000 S. HOUGHTON RD.
SANTA CLARA

June- 07

SPATIAL
SCALE (h)

PRESENT

2498 N. GERONIMO
SOUTH TUCSON

METHOD (e) ELEV. SMPL
FEET (f) HEIGHT
(M) (g)

04-019-1018

81102

SP

Jan-85

127

PRESENT

127

Jan-94

126

2638

4 .5

URBAN

PRESENT

12101 N. CAMINO DE OESTE

LEAD -PIMA COUNTY MONITORING NETWORK
CHILDREN'S PARK NCore

04-019-1028

14129

SLAMS

Feb-12

110

2286

2.0

NEIGHBORHOOD

6DAY

PRESENT

400 W. RIVER ROAD

110

Collocated every
12 days

2

CHEMICAL SPECIATION -PIMA COUNTY MONITORING NETWORK
CHILDREN'S PARK NCore
400 W. RIVER ROAD

04-019-1028

88502

SLAMS

Feb-02

810

PRESENT

15

2286

3.0

3 DAY

5

POPULATION EXPOSURE

2015 Ambient Air Monitoring Network Plan

2015 Ambient Air Monitoring Network Summary Table
PM2.5- PIMA COUNTY MONITORING NETWORK
SITE NAME AND LOCATION

SITE ID (a)

GERONIMO

04-019-1113

PARAMETER
(b)
88501

CLASSI- DATES (d) METHOD (e) ELEV. SMPL
FICATION
FEET (f) HEIGHT
(c)
(M) (g)

SPATIAL
SCALE (h)

SP

July-03

SMPL
FREQ (i)

POC MONITORING
(j)
SITE TYPE (h)

733

2452

4.6

NEIGHBORHOOD CONTINUOUS

3

POPULATION EXPOSURE

733

2910

4.8

NEIGHBORHOOD CONTINUOUS

3

POPULATION EXPOSURE

2286

3.1

NEIGHBORHOOD 3 DAY

1

POPULATION EXPOSURE

2

PRESENT

2498 N. GERONIMO
04-019-1030

GREEN VALLEY

88501

SP

601 N. LA CANADA DR.
CHILDREN'S PARK NCore

04-019-1028

88101

SLAMS

400 W. RIVER ROAD
CHILDREN’S PARK NCore

July-03
PRESENT

04-019-1028

88101

SLAMS

Jan-99

118

PRESENT

118

Jan-11

170

2286

4.3

collocated every 6
day
NEIGHBORHOOD CONTINUOUS

118

2234

2.65

NEIGHBORHOOD 3 DAY

1

POPULATION EXPOSURE

733

2387

4.9

NEIGHBORHOOD CONTINUOUS

3

POPULATION EXPOSURE

733

2100

4.9

NEIGHBORHOOD CONTINUOUS

3

POPULATION EXPOSURE

3

POPULATION EXPOSURE

PRESENT

400 W. RIVER ROAD
04-019-0011

ORANGE GROVE

88101

SLAMS

04-019-1032

ROSE ELEMENTARY

Jan-99
PRESENT

3401 W. ORANGE GROVE RD.
88501

SP

July-03
PRESENT

710 W. MICHIGAN
04-019-1034

COACHLINE
9597 N. COACHLINE BLVD

Key:

88501

SP

July-03
PRESENT

a - Site ID - site identification code used in the AQS database
b - Parameter - code used in the AQS database to describe the pollutant monitored
c - Classification – described on page 2
d - Dates - dates sampling began and ended
e - Method - code used in the AQS database indicating the type of instrument used
f - Elev. feet - site elevation in feet
g - SPL (M) Height - sample inlet height in meters, specific height range required for uniform collection
h - Spatial Scale and Monitoring site type - described on page 6
i - SMPL Freq - frequency of sampling days
j - POC - parameter occurrence code used to distinguish between two or more instruments
measuring the same parameter at the same time
Information provided based on EPA'S 2015 Air Quality System (AQS) data.

16

2015 Ambient Air Monitoring Network Plan

IV. CURRENT MONITORING NETWORK EVALUATIONS
PM 10 MONITORING NETWORK REQUIREMENTS
The PDEQ PM 10 network consists of seven monitoring sites in eastern Pima County, Arizona. The 2015
network used several different types of PM 10 samplers: R& P Partisol 2000, R& P Partisol-Plus 2025
Sequential, BAM 1020 and TEOM 1400. 40 CFR Part 58, app. D, 4.6 Particulate matter (PM 10 ) design
criteria, provided guidance in determining the minimum number of required PM 10 SLAMS sites for 2015.
2015 PM 10 Design Criteria
Table 5
Population
Pima County

2010 Census
980,263

MSA 8520
Tucson
Population
Category
500,000 –
1,000,000

Max
Concentration
site
2013-2015
South Tucson

Max
Concentration
3
(µg/m )

PM 10 Sites
# Required

PM 10 Sites
# Operating

62

Requires 1-2
SLAMS
monitors

3 SLAMS
monitors

a

2014 Estimated
>1,000,000
2-4 SLAMS
Population 1,004,516
monitors
a. U.S. Census Bureau 2014 population estimate of the Tucson area (MSA 8520) is 1,004,516.

Violation History

The PM 10 24 hour standard remains at 150 µg/m3. Since the promulgation of the PM 10 standard, July 31,
1987, there has been one violation of the standard. In 1999, the PM 10 standard was violated with four
recorded exceedances at the Orange Grove location and two exceedances at the South Tucson location.
Subsequently, the monitoring schedules for the Orange Grove and South Tucson locations have been
changed from every six day sampling to every day sampling, as indicated in 40 CFR Part 50, app. K and
40 CFR Part 58.13. In the last three years, exceedances of the 24 hour standard have been recorded at
monitoring sites in the PDEQ PM 10 network at the following locations: In 2013, one exceedance on April
8 at the South Tucson location and on April 9th there was one exceedance each, at the South Tucson,
Geronimo, and Green Valley stations. These exceedances may also be considered as an Exceptional Event
dependent on approval from EPA. In 2014, there were three exceedances on July 25 at the Green Valley,
Geronimo, Orange Grove monitoring sites. These exceedances may also be considered as an Exceptional
Event dependent on approval from EPA. In 2015, there were no recorded exceedances for PM 10 .

17

2015 Ambient Air Monitoring Network Plan

Quality Assurance for Particulate Matter PM 10
All data quality assessment requirements, as outlined in 40 CFR Part 58, app. A, have been met for
2015. The precision of PM 10 data is derived from the co-located PM 10 samplers at the South Tucson and
Orange Grove sites; the difference in concentration between the two samplers running side-by-side is used
to calculate the precision of the data. At the end of each calendar quarter, a combined precision
probability interval for monitors is calculated by EPA.

The accuracy of PM 10 sampling is assessed by auditing the flow rate of at least 25% of the samplers each
calendar quarter, such that each sampler is audited at least once per year. The difference in the flow rate
between the audit flow measurement and the flow indicated by the sampler is used to calculate accuracy.

Protocol
Flow rate
verification
Flow Rate
Audit
Flow rate
verification
Flow Rate
Audit

Instrument
Met One BAM
1020
R&P TEOM 1400
TEOM 1400AB

Table 6
Frequency Date Completed 2015
Weekly

Semi Annually
R& P Partisol 2000, Monthly
R& P Partisol-Plus
2025 Sequential
R& P Partisol 2000, Semi R& P Partisol-Plus Annually
2025 Sequential
Bam 1020

NPAP Audit

Green Valley 03/10, 09/23
Geronimo 03/24, 09/22

Corona de Tucson 03/09, 09/24,
Santa Clara 03/09, 09/23
Tangerine 03/12, 09/22
South Tucson 03/10, 09/30
South Tucson (co-located) 03/10, 09/30
Orange Grove 03/11, 09/17
Orange Grove (co-located) 03/11, 09/17

None

Method

81102

Table 7
Collocated PM 10 Monitors
# Required
# Primary
Collocation
Monitors
Monitors
1
7

18

# Collocated
Monitors
2

2015 Ambient Air Monitoring Network Plan

Table 8
Annual summary statistics: NAAQS: 150 µg/m3 24- Hour Average.

Orange Grove
0011

54

2nd
Annual
Highest Average
24-Hour
Value
53
20.8

Corona de
Tucson 0008
Santa Clara
1026

59

30

12.6

55

40

18.4

Green Valley
1030
Geronimo 1113

32

30

11.6

57

53

25.3

Tangerine
1018
South Tucson
1001

47

28

14.5

62

52

20.7

Highest
24- Hr
Value

Year
2015
Site

Particulate Matter Weigh Lab
Pima County Department of Environmental Quality operates a filter weigh lab for the processing of Pima
County’s PM 10 and PM 2.5 network filters, excluding PM 2.5 speciation filters. This weigh lab follows all
requirements set forth in Appendix L of 40 CFR Part 50.
Sampling Schedule Calculation
The design value for the Tucson area network was determined using the PM 10 SIP Development
Guideline, Section 6.3.1 “Table look-up” procedure. Three years of sampling data, 2013 – 2015, were
used. For that period, the Orange Grove monitoring location was determined to have the highest design
value (including possible exceptional events). That value was 115µg/m3. The ratio of this value to the 24
hour standard of 150 µg/m3, .76, was then compared to the brackets in Figure 1 from 40 CFR 58.12(e) to
arrive at a minimum PM 10 sampling frequency of every sixth day. Orange Grove operates on an every day
sampling schedule.

19

2015 Ambient Air Monitoring Network Plan

PM 2.5 MONITORING NETWORK REQUIREMENTS
The PDEQ PM 2.5 network consists of six monitoring sites in eastern Pima County, Arizona, 40 CFR Part
58.20, App. D. 4.7. PM 2.5 design criteria provided guidance on the required number of SLAMS monitors.
Two SLAMS Federal Reference Method (FRM) monitors were initiated in January, 1999 at the Orange
Grove and Children’s Park sites. In addition to two FRM SLAMS monitors, Pima County operates an
FEM SLAMS continuous monitor, and four non- regulatory continuous monitors.

Population
Pima
County

MSA 8520
Tucson
Population
Category

2010 Census
980,263

500,000 –
1,000,000

2014
estimated
population
1,004,516

2015 PM 2.5 Design Criteria
Table 9
PM2.5 SLAMS (FRM and FEM)
Design Value
Annual Daily
PM 2.5 Sites
Site
Design
Design
# Required
Value
Value
Years
Years
201320132015
2015

Children’s Park

5.5µg/m3

>1,000,000

Method
88101 Method
118

13µg/m3

Requires 1
SLAMS
monitor
<85% of
NAAQS

PM 2.5 Sites
# Operating

2 SLAMS monitors

Requires 2

Table 10
Collocated PM 2.5 Monitors
# Required Collocation
# Primary Monitors
Monitors

# Collocated
Monitors

1

1

2

General Statement regarding changes to the PM 2.5 network:
PDEQ does not have any violating monitors or proposals to move or change any monitors at this time. In
the event of proposed changes to the PM 2.5 network or violating monitors, PDEQ would detail all
information and present it to the public for comment and would forward all comments and information to
EPA for approval. After approval, PDEQ would then initiate any changes.

20

2015 Ambient Air Monitoring Network Plan

Regional Transport or Background:
ADEQ operates an FEM monitor at their Alamo Lake site for regional background, and an FEM monitor
at their Yuma Supersite for regional transport.
The PDEQ SLAMS FRM monitors are filter-based low-volume samplers that collect a sample for 24
hours on a 1 in 3 day cycle. A co-located sampler at the Children’s Park NCore site runs on a 1 in 6 day
cycle for precision assessment.
Continuous PM 2.5 monitoring was initiated in May, 2000 at the Green Valley site using Beta Mass
Attenuation (Met One BAM 1020) and a sharp-cut cyclone. This installation was a pilot project and was
followed by similar installations at the Rose Elementary and Coachline monitoring sites. All three sites
were a part of the EMPACT project (Environmental Monitoring for Public Access and Community
Tracking), designed to provide near real-time data to the public via the internet and PDEQ web pages. A
fourth monitor was added at the Geronimo site to provide fine particulate data for AQI reporting. The
These monitors provide automatic concentration measurement on an hourly basis, and output the reading
to the site data logger, which is then polled every hour, and the data posted on the PDEQ website. The
PM 2.5 monitors at these four sites are operated as non-regulatory, intended only to provide information to
the public. They are operated under the same Quality Control and Quality Assurance protocols as
regulatory monitors to assure meaningful data are provided, but they are operated using alternative
instrument settings (50 minute sample, 4 minute count time) that do not conform to FEM designation
parameters for PM 2.5 . This setting does not compromise the accuracy of the readings, and is inherent in
the original design and designation of all FEM PM 10 BAM 1020 monitors. The data obtained by FRM,
continuous, FEM and non-regulatory monitors in Tucson are submitted quarterly to the EPA’s Air Quality
System (AQS) database.
Pima County Department of Environmental Quality operates a filter weigh lab for the processing of Pima
County’s PM 10 and PM 2.5 network filters, excluding PM 2.5 speciation filters. This weigh lab follows all
requirements set forth in 40 CFR Part 50, App. L.
The PM 2.5 Chemical Speciation Trends Network was established by EPA in 1999 to determine the
chemical speciation of fine particulates. PM 2.5 speciation monitoring began in Pima County at the
Children’s Park location in February, 2002. The samples are analyzed for forty eight elements, cations,
nitrate, sulfate, organic and elemental carbon. Analysis and reporting is completed by RTI International.

Violation History
The PM 2.5 standard (December 14, 2012): the annual PM 2.5 standard is met when the three year average
of the spatially averaged annual mean is less than or equal to 12ug/m3 and the 24 hour standard is met
when the three year average of the 98th percentile value at each site is less than or equal to 35ug/m3. No
exceedances of the annual or 24 - hour NAAQS were recorded in Tucson in 2015.

21

2015 Ambient Air Monitoring Network Plan

Quality Assurance for Particulate Matter PM2.5
All data quality assessment requirements as outlined in 40 CFR Part 58, app. A have been met in 2015,
and include both internal and EPA PEP audits, and the co-located sampler at the Children’s Park NCore
site.
The accuracy of PM 2.5 sampling is assessed by auditing the flow rate every six months. The difference in
the flow rate between the audit flow measurement and the flow indicated by the sampler is used to
calculate accuracy. A combined accuracy probability interval is calculated for PM 2.5 along with separate
probability limits for each audit concentration level for automated analyzers. Pima County reports the
results of all valid precision and accuracy tests on a quarterly basis to the Air Quality System (AQS)
database.
Table 11
Protocol
Flow rate
verification
Flow Rate
Audit

Instrument
Met One BAM 1020

Frequency
Weekly

Date Completed 2015

Met One BAM 1020

Semi Annually

Green Valley 03/10, 09/23
Geronimo 03/12, 09/22
Rose Elementary 03/10, 09/23
Coachline 03/12, 09/22
Children’s Park 03/26, 09/17

Flow rate
verification

R& P Partisol-Plus 2025
Sequential
R & P 2000
R& P Partisol-Plus 2025
Sequential
R& P 2000 (Co- located)
Met One SASS
(Speciation)
URG – 3000N
(Speciation)

Monthly

Flow Rate
Audit

NPAP Audit

Semi Annually

Orange Grove 03/11, 09/17
Children’s Park 03/24, 09/17
Children’s Park (Co-located) 03/24, 09/17
Children’s Park (Speciation, SASS) 03/24, 09/10
Children’s Park (Speciation, URG) 03/24, 09/10

None

22

2015 Ambient Air Monitoring Network Plan

Table 12
Annual summary statistics: NAAQS PM 2.5 : 12 µg/m3 Annual Average, 35 µg/m3 24 Hour Average.
Highest
24 Hr
Value

2nd
Highest
Value

98th % Annual
Value Average

Orange Grove

19.5

13.0

9.8

4.6

Children’s Park (Meth. 118)

18.2

10.1

9.6

4.4

Children’s Park (Meth. 170)

19.1

15.1

10.5

5.1

Green Valley

8.1

7.6

8.0

2.76

Geronimo

19.0

18.2

15.5

6.05

Rose Elementary

25

23

17.8

8.64

Coachline

16.7

15.9

12.8

5.88

Year
2015
Site

PM 10 - 2.5 (PM-Coarse) MONITORING NETWORK REQUIREMENTS
Pima County is monitoring for PM- Coarse at the Children’s Park NCore station as part of the monitoring
requirements for an NCore station. PM-Coarse is the arithmetic difference between separate but
concurrent collocated measurements of PM 10 and PM 2.5 , also referred to as PM 10-2.5 . Pima County is
following the requirements set forth in 40 CFR Part 50, App O. The collocation for PM 10-2.5 is fulfilled
by the national NCore Network.
The PM 10-2.5 is described on page 39.

Year
2015
Children’s Park NCore
PM10 - PM2.5 (86101)

Table 13
PM-Coarse Annual summary statistics
Highest 24- Hr
2nd Highest 24Value
Hour Value
36

29

23

Annual Average

10.68

2015 Ambient Air Monitoring Network Plan

OZONE MONITORING NETWORK REQUIREMENTS
Ozone (O 3 ) is currently being monitored at seven locations in Tucson and one location in Green Valley.
Pima County monitors year round for ozone. EPA has revised the minimum monitoring requirements for
ozone. The design criteria for ozone monitoring is described in 40 CFR Part 58, app. D, Table D-2.

Population MSA 8520
Pima
Tucson
County
Population
Category
2010 Census
980,263

2014
Estimated
Population
1,004,516

500,000 –
1,000,000

Table 14
2015 O 3 Design Criteria
Design Value
8- Hour Design
Site
Value
(2013-2015)
Saguaro Park
040190021

.069 ppm

>1,000,000

O 3 Sites
# Required

O 3 Sites
# Operating

Requires 2 SLAMS
monitors

3 SLAMS
monitors

No requirement for
SP

5 SP monitors

Same requirement

Violation History
On October 26, 2015, EPA strengthened the ozone standard from 0.075 ppm to 0.070 ppm, keeping the
form of the standard as the three year average of the fourth highest daily maximum eight hour average
ozone concentration. The secondary standard is identical to the primary standard. Pima County has not
violated the ozone standard in 2015.
Quality Assurance for Ozone
All data quality assessment requirements outlined in 40 CFR Part 58, app. A, have been met in 2015.
The requirements include precision checks a minimum of every other week with a check gas range
between 0.01 and 0.10 ppm with Pima County performing the precision check at 0.075 ppm, representing
the highest level we are likely to achieve. The annual internal audits for accuracy are performed with four
point check levels at zero, 0.035ppm, 0.055ppm, and 0.085ppm. Pima County maintains an ozone primary
standard which is verified annually for accuracy by the California Air Resources Board in Sacramento.
Pima County passed the NPAP Ozone TTP Audit for Rose Elementary and Green Valley. All valid
precision and accuracy tests are reported to the Air Quality System (AQS) database on a quarterly basis.

24

2015 Ambient Air Monitoring Network Plan

OZONE MONITORING NETWORK REQUIREMENTS

Table 15
Ozone Audit Dates 2015
22nd St. & Craycroft 5/27, 12/7
Children’s Park 3/19, 6/23, 12/21
Fairgrounds 6/18, 12/16
Tangerine 3/12, 6/10, 12/09
Saguaro Park 6/18, 12/16
Coachline 3/12, 6/10, 12/09
Rose Elementary 6/19, 12/28
Green Valley 6/25, 12/28
NPAP Ozone TTP Audit Dates 2015
Rose Elementary 5/20, Green Valley 5/20

Table 16
Annual summary statistics: NAAQS: 0.075 ppm 4th highest 8- Hour Average
New Ozone NAAQS (as of October 26, 2015) 0.070 ppm 4th highest 8- Hour Average
1st Max.
8- HR Avg

4th Max.
8- HR Avg
(ppm)
.065

Year
2015
Site

1st Max. 1-HR
Avg (ppm)

22nd St. & Craycroft
1011

.074

.068

Children’s Park
1028
Fairgrounds

.070

.064

.063

.077

.066

.063

.071

.066

.065

.075

.071

.066

.067

.063

.062

.078

.070

.065

.064

.061

.059

(ppm)

1020

Tangerine
1018
Saguaro Park
0021
Coachline
1034
Rose Elementary
1032
Green Valley 1030

25

2015 Ambient Air Monitoring Network Plan

CARBON MONOXIDE MONITORING NETWORK REQUIREMENTS

Carbon Monoxide is monitored at five locations throughout the eastern Pima County. The revised
requirements for Carbon Monoxide 40 CFR Part 58, app. D, 4.2 state that there is no minimum number
of CO monitoring sites required. Pima County is operating under the auspices of the CO Limited
Maintenance Plan (LMP) and has maintained the same number of sites in order to meet and exceed the
requirements of the LMP.

Population
Pima County

2010 Census 980,263

2015 CO Design Criteria
Table 17
MSA 8520
1- Hour
CO Monitors
Tucson
Design Value # Required
Population Category
2014-2015
500,000 – 1,000,000

2.0 ppm

No Specific Requirement

CO Monitors
# Operating

2 SLAMS monitors
3 SP monitors

a
2014 Estimated
>1,000,000
Requires 1
Population 1,004,516
a. Requires one, collocated with one required Near-Road NO 2 monitor, per 40 CFR Part 58, app. D, 4.2.1 and 4.3.2. Refer
to page 4 of this Plan for additional information on Near-Road Monitoring.

Motor vehicles are the primary source of carbon monoxide (CO) in the Tucson area. In spite of increased
vehicular traffic, CO levels have dropped considerably since the county began monitoring in 1973. The
dramatic decrease can primarily be contributed to the progress made by automobile manufacturers in
meeting federally mandated tailpipe emissions standards and to the state vehicle inspection / maintenance
programs.

Violation History
No exceedances of the National Ambient Air Quality Standards for CO were recorded in Tucson from
1989 through 2015. In January 1988, the eight - hour health standard of nine parts per million was
exceeded once at two monitoring sites on the same day. The last exceedance of the eight - hour standard
prior to 1988 occurred in December 1986 at a special purpose microscale location (Broadway / Craycroft).
Pima County’s status for CO was reclassified to attainment with the implementation of a Limited
Maintenance Plan on April 25, 2000 by the EPA. The Carbon Monoxide Limited Maintenance Plan was
developed in conjunction with Pima Association of Governments and approved by EPA to help mitigate
any future violations. The plan allows for additional mobile monitoring of CO at high volume
intersections, and a microscale site located at Golf Links & Kolb was established, September, 2002.

26

2015 Ambient Air Monitoring Network Plan

CARBON MONOXIDE MONITORING NETWORK REQUIREMENTS

Quality Assurance for Carbon Monoxide
All data quality assessment requirements as outlined in 40 CFR Part 58, app. A, have been met in 2015.
The precision of SLAMS automated analyzers is based on one-point precision QC checks with a
minimum frequency of every two weeks, when each analyzer is challenged by a known concentration of a
check gas. For CO the concentrations are between 1.0 and 10.0 ppm. The requirements include annual
audits performed in-house for accuracy. Three levels are reported of the four audit point levels that are
used for CO. The audit levels are: level two at 0.900 - 2.99 ppm, level three at 3.0 -7.99 ppm, level four at
8.0 -15.99 ppm and level five at 16.0 -30.99 ppm. All valid precision and accuracy tests are reported to the
Air Quality System (AQS) database on a quarterly basis.
Table 18
Carbon Monoxide Audit Dates 2015
Craycroft & 22nd St. 5/27, 12/07
Children’s Park 3/13, 6/23, 12/21
Cherry & Glenn; Seasonal 3/31, 12/09
Alvernon & 22nd St. 3/11, 5/27, 12/07
Golf Links & Kolb; Seasonal 3/31, 12/16
NPAP Carbon Monoxide TTP Audit Dates 2015
None
Table 19
Annual summary statistics: NAAQS: 35ppm 1-Hour Average, 9ppm 8- Hour Average
Year
2015

1st Max.
1- HR Avg

2nd Max.
1- HR Avg

1st Max.
8- HR Avg

Site
Craycroft & 22nd St 1011

1.7

1.6

0.8

0.8

Children’s Park 1028

1.0

1.0

0.8

0.8

Cherry & Glenn 1021

2.0

2.0

1.4

1.4

Alvernon & 22nd St. 1014

2.2

1.9

1.0

1.0

Golf Links & Kolb 1031

1.6

1.6

1.0

0.9

27

2nd Max.
8- HR Avg

2015 Ambient Air Monitoring Network Plan

NITROGEN DIOXIDE MONITORING NETWORK REQUIREMENTS
Nitrogen dioxide (NO 2 ) is currently measured at two locations in Tucson. The Environmental Protection
Agency has revised the NO 2 requirements. The 40 CFR Part 58, app. D, 4.3, design criteria document
states that there are no minimum requirements for the number of NO 2 monitoring sites in Pima County.
2015 NO 2 Design Criteria
Table 20

MSA 8520
Tucson
Population
Category

Annual
Design
Value

1- Hour 98th
Percentile
Design
Value

# of Required NO 2
Monitors

# of NO 2
Monitors

2010 Census
980,263

500,000 –
1,000,000

8.83ppb

42.3 ppb

No Requirement
a
Requires 1 microscale

1 SLAMS monitor
1 SP monitor

2014 Estimated
Population
1,004,516

>1,000,000

b

c

Population
Pima County

a.

b.
c.

Require 1 microscale
c
Requires 1 area-wide

1 SLAMS areawide monitor
1 SP monitor

Requires one microscale NO 2 monitor for populations over 500,000, due January 1, 2017 per 40 CFR Part 58, app. D,
4.3.2. This requirement is under review by EPA, see page 4 of this Plan for additional information on Near-Road
Monitoring, and Federal Register Proposed Rule, 81 FR 30224.
Requires one microscale NO 2 monitor for populations over 500,000 per 40 CFR Part 58, app. D, 4.3.2.
Requires one area-wide NO 2 monitor for populations greater than 1,000,000 per 40 CFR Part 58, app. D, 4.3.3(a).

Historical Nitrogen Dioxide Monitoring
Nitrogen dioxide (NO 2 ) levels remain well below federal standards. The Craycroft and 22nd St. monitor
has been operational since 1973, measuring typical neighborhood NO 2 concentrations. Much of the data
has been used in studies measuring the effects of NO 2 as a precursor to ozone formation.
A NO 2 analyzer was operating at the Pomona site from 1988 until 1996, when the site was closed. The
site was re-established at the Children’s Park location in May, 1998, one mile east of the original Pomona
Site, and allows for continued monitoring on the north side of Tucson and in the lower valley area.
A NO 2 analyzer was operating at the Downtown site until early 1989. From 1995 to December 2001,
NO 2 monitoring was conducted at Saguaro National Park East to establish baseline conditions in a Class I
Wilderness Area.

28

2015 Ambient Air Monitoring Network Plan

NITROGEN DIOXIDE MONITORING NETWORK REQUIREMENTS

Quality Assurance for NO 2
All data quality assessment requirements outlined in 40 CFR Part 58, app. A, have been met for 2015.
The requirements include precision QC checks with a minimum frequency of every other week with a
check gas range between 0.01 and 0.10 ppm and annual internal audits for accuracy with three point
check levels between 0.008 - 0.019 ppm, 0.02 - 0.049 ppm, 0.05 - 0.099 ppm and 0.10 - 0.299 ppm . All
valid precision and accuracy tests are reported to the Air Quality System (AQS) database on a quarterly
basis. 2015 precision and accuracy tests will be reported in ppb.
Table 21
Nitrogen Dioxide Audit Dates 2015
Craycroft & 22nd St. 5/27, 12/07
Children’s Park 3/19, 6/23, 12/21
Nitrogen Dioxide TTP Audit Dates 2015
None
Table 22
Annual summary statistics: NAAQS: 100 ppb 1- Hour Average (98th percentile of the 1-hour
concentrations averaged over three years); 53 ppb Annual Average
1st Max.
1- Hour
Avg

1 - Hour
98th
Percentile

Annual
Mean

Site
Craycroft & 22nd St 1011

45.4

40.4

8.56

Children’s Park 1028

40.7

35.7

8.83

Year
2015

29

2015 Ambient Air Monitoring Network Plan

REACTIVE OXIDES OF NITROGEN (NO Y ) MONITORING NETWORK REQUIREMENTS
Reactive Oxides of Nitrogen are currently monitored at one location in Pima County fulfilling the NCore
site requirement.

Quality Assurance for NO y
All data quality assessment requirements outlined in 40 CFR Part 58, app. A, have been met for 2015.
The requirements include precision QC checks with a minimum frequency of every other week with a
check gas range between 0.01 and 0.10 ppm and annual internal audits for accuracy with three point
check levels between 0.008 - 0.019 ppm, 0.02 – 0.049 ppm and 0.05 – 0.099 ppm . All valid precision and
accuracy tests are reported to the Air Quality System (AQS) database on a quarterly basis. 2015 precision
and accuracy tests will be reported in ppb.
Table 23
Reactive Oxides of Nitrogen Audit Dates 2015
Children’s Park NCore 3/19, 6/23, 12/21
Reactive Oxides of Nitrogen TTP Audit Dates 2015
None
NPAP Audit Dates 2015
None
Table 24
Annual summary statistics: reported in ppb
1st Max.
Annual
1- Hour
Mean

Year
2015
Site
Children’s Park 1028

Avg

127.2

30

10.2

2015 Ambient Air Monitoring Network Plan

SULFUR DIOXIDE MONITORING NETWORK REQUIREMENTS

Sulfur Dioxide (SO 2 ) is currently monitored at one location in Pima County. On October 1, 2010, an SO 2
trace monitor was added at the Children’s Park NCore location as required for an NCore site. The
SO2 monitor at the 22nd and Craycroft site was discontinued on December 31, 2010.
The Environmental Protection Agency has revised the SO 2 requirements. The design criteria indicated in
40 CFR Part 58, app. D, 4.4, states that there are no minimum requirements for the number of SO 2
monitoring sites.
2015 SO 2 Design Criteria
Table 25

Population
Pima
County

MSA 8520
Tucson
Population
Category

Total
SO 2
[tons/year]
Based on
2011 N EI

Population
Weighted
Emissions
Index
[million

Data
1- Hour
Requirements Design
Rule Sources Value
using
Monitoring

# of
Required
SO 2
Monitors

# of SO 2
Monitors

No
Requirement

1 NCore
SLAMS

persons- tons
per year]

2010 Census
980,263

500,000 –
1,000,000

2014
Estimated
Population
1,004,516

>1,000,000

2,184.9

2194.8

6.0 ppb

No
Requirement

Historical Sulfur Dioxide Monitoring

Ambient concentrations of sulfur dioxide (SO 2 ) in Tucson have historically remained well below all
federal standards, and in recent years have been extremely low. With new trace SO 2 monitoring we can
now get more accurate readings at very low levels. The only major stationary sources of SO 2 possibly
affecting ambient concentrations in the Tucson air planning area are the coal burning generators at the
Irvington Road power plant operated by Tucson Electric Power, which are in the process of being
discontinued with the conversion to natural gas.
Quality Assurance for SO 2
All data quality assessment requirements outlined in 40 CFR Part 58, app. A, have been met for 2015.
The requirements include precision checks every other week with a check gas range between 0.01 and
0.10 ppm and annual internal audits for accuracy with three point check levels between 0.0003 - 0.0029
ppm, 0.0030 – 0.0049 ppm and 0.005 – 0.0079 ppm . All valid precision and accuracy tests are reported to
the Air Quality System (AQS) database on a quarterly basis.

31

2015 Ambient Air Monitoring Network Plan

Table 26
Sulfur Dioxide Audit Dates 2015
Children’s Park NCore 3/13, 6/23, 12/21
Sulfur Dioxide TTP Audit Dates 2015
None

Table 27
Annual summary statistics: Sulfur Dioxide NAAQS: 75 ppb 1- Hour Average (99th percentile of the 1hour daily maximum concentrations, averaged over 3 years)
Year
2015
Site
Children’s Park NCore 1028

1st Max.
1- Hour
Avg

1–Hour
99th
Percentile

Annual
Mean

5.1

4.6

0.16

32

2015 Ambient Air Monitoring Network Plan

LEAD MONITORING NETWORK REQUIREMENTS
Lead is currently monitored at the Children’s Park NCore location in Pima County. This is a non-sourceoriented monitor.
On October 15, 2008 EPA strengthened the lead standard. Research and technology has shown that
adverse health effects occur at much lower levels of lead in blood than previously thought. Children are
particularly vulnerable to the effects of lead. The primary standard of 1.5 ug/m3 has been lowered to
0.15ug/m3, measured as total suspended particles (TSP).The secondary standard is identical to the primary
standard. According to the 2005 National Air Emissions Inventory (NEI) from EPA, Pima County has no
sources of lead of one ton or more. This means that Pima County is required to perform area monitoring
only, which is done at the Children’s Park NCore location. Monitoring and reporting began in February
27, 2012.
The sampling schedule for lead is based on the 2015 EPA’s monitoring sampling schedule with a one in
six day schedule for the primary monitor and a one in twelve day schedule for the collocated lead monitor.

The design criteria indicated in 40 CFR Part 58, app. D, 4.5, states that there is one required lead
monitor.
2015 Lead Design Criteria
Table 28

NCore Site

Children’s Park
040191028

MSA 8520
Tucson
Population
Category

Population
Pima
County

Lead Design
Value

# Required
monitors

# of Pb
Monitors

500,000 –
1,000,000

2010 Census
980,263

0.00

1

1- NCore
1- Collocated

>1,000,000

2014 Estimated
Population
1,004,516

1

Same as above

33

2015 Ambient Air Monitoring Network Plan

Historical Lead Monitoring
Lead concentrations are extremely low in Tucson. Lead monitoring began in Pima County in 1975 at eight
TSP sampling locations. In August, 1978, lead analyses were discontinued at all but two sites. Magnetic
Observatory (University of Arizona) and Prince Road were selected to represent a neighborhood site and
roadway site, respectively. Lead sampling was started at a third site (Broadway & Swan) in January 1983.
Lead analysis at Magnetic Observatory was discontinued in 1983 due to lack of detectable levels of lead.
A TSP sampler was installed at South Tucson in 1991 for purposes of lead analysis. This site, along with
the other two remaining sites, (Prince Road and Broadway & Swan) adequately fulfilled the siting criteria
for measuring potential highest urban concentrations of lead in the particulate monitoring network.
In March of 1992 the Broadway & Swan lead analysis was discontinued and the TSP samplers from the
South Tucson and the Magnetic Observatory sites were moved to the 22nd & Craycroft site. 22nd &
Craycroft and Prince Road sites remained until March of 1997.

Quality Assurance for Lead
All data quality assessment requirements outlined in 40 CFR Part 58, app. A, have been met for 2015.
The requirements include quarterly flow rate verification and audits. All valid precision and accuracy tests
are reported to the Air Quality System (AQS) database on a quarterly basis.

Protocol
Flow rate
verification

Instrument
Tisch Hi Vol with
Brushless Motor

Flow Rate
Audit
NPAP Audit

Table 29
Frequency Date Completed 2015
Quarterly
1/30, 2/23, 3/19, 4/29, 5/27, 6/05, 7/17 8/18, 9/21,
10/27, 11/10, 12/14
Collocated: 1/30, 2/23, 3/19, 4/29, 5/27, 6/5, 7/17
8/18, 9/21, 10/27, 11/10, 12/14
SemiAnnually

2/26, 3/18, 5/01, 5/28, 7/16, 10/14
Collocated: 03/24, 9/17

none
Table 30
Annual summary statistics: NAAQS Lead: 0.15 µg/m3 three month average
1st Max.
2nd Max.
Annual Mean
Year
24- Hour
24- HR Avg
2015
Avg

Site
Children’s Park 1028

.008

34

.005

.003

2015 Ambient Air Monitoring Network Plan

V. DETAILED SITE AND MONITOR INFORMATION
CHILDREN’S PARK NCore: AQS # 040191028

Site Name
AQS ID
Address
Latitude / Longitude
Elevation
Surrounding landscape
Location description

Site Description
CHILDREN’S PARK NCore
040191028
400 W. River Road, Tucson, AZ
32.295150 / -110.982300
2286
Gravel in walled compound, dirt parking lot, dry river bed
This site is located at the confluence of the Rillito River and Pima
Wash, a natural low spot in the local topography. Single - family
residences and a popular county park with exercise trails extend to
the north, northwest, and west, respectively. Heavy commercial
usage dominates to the south and east, including large shopping
malls and automobile dealerships.

35

2015 Ambient Air Monitoring Network Plan

Site Name

Monitoring Information
CHILDREN’S PARK NCore

Pollutant
Method Code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
Purpose
Site Type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical Lab
Monitor type
Monitor Network Affiliation
Scale
Number of daily observations
Number / Dates of 24-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to monitor
/ ADT

Suitable for comparison to PM 2.5 Annual
NAAQS
Site meets 40 CFR 58, Appx. A,C,D,E
MSA

PM 2.5 - Not a Primary Monitor
170
1
88101 / 3
NAAQS Comparison / Population Exposure
Population Exposure
Met One / BAM 1020
FEM
PDEQ / PDEQ
n/a
SLAMS
NCore
Neighborhood
353
0
0
Continuous
4.3 meters
360
1.73 meters
n/a
n/a
14.3 meters
n/a
n/a
Arizona State Route 77 runs north - south 0.5 kilometers
to the east, providing six lanes of heavily used arterial
routing with a 2012 ADT of 44,000.
River Road runs east – west 0.5 kilometers to the north,
with a 2012 ADT of 33,414
YES
YES

Tucson, AZ 8520

Comments: Continuous PM 2.5 sampling began at this neighborhood scale site on January 23, 2011.

36

2015 Ambient Air Monitoring Network Plan

Site Name

CHILDREN’S PARK NCore

Pollutant
Method Code
Number of monitors
Parameter code/ POC
Basic monitoring objective / Statement of
Purpose
Site Type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical Lab
Monitor type
Monitor Network Affiliation
Scale
Number of daily observations
Number / Dates of 24-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height

PM 2.5 Primary
118
1
88101 /1
NAAQS Comparison / Population Exposure

Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

Suitable for comparison to PM 2.5 Annual
NAAQS
Site meets 40 CFR 58, Appx. A,C,D,E
MSA

Population Exposure
R & P/ Partisol-Plus 2025
FRM
PDEQ / PDEQ
PDEQ
SLAMS
NCore
Neighborhood
119
0
0
Every three days
3.1 meters above the ground on a platform located in a city
water well site.
290, from 280 to 210, includes predominant wind direction
from 135 (SE)
2.08 meters
n/a
n/a
8.0 meters
n/a
1.2 meters /Every twelve days (after April 27, 2013 every
six days) / R& P 2025
Arizona State Route 77 runs north - south 0.5 kilometers to
the east, providing six lanes of heavily used arterial routing
with a 2012 ADT of 44,000.
River Road runs east – west 0.5 kilometers to the north, with
a 2012 ADT of 33,414
Yes
Yes

Tucson, AZ 8520

Comments: Sampling began in 1999.

37

2015 Ambient Air Monitoring Network Plan

Site Name

CHILDREN’S PARK NCore

Pollutant
Method Code
Number of monitors
Parameter code/ POC
Basic monitoring objective / Statement of
Purpose
Site Type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical Lab
Monitor type
Monitor Network Affiliation
Scale
Number of daily observations
Number / Dates of 24-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height

PM 2.5 Collocated
118
1
88101 / POC 2
Collocated monitor / Requirement

Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

Suitable for comparison to PM 2.5 Annual
NAAQS
Site meets 40 CFR 58, Appx. A,C,D,E
MSA

Population Exposure
R & P / Partisol-Plus 2025
FRM
PDEQ / PDEQ
PDEQ
SLAMS
NCore
Neighborhood
30
0
0
Every twelve days; after April 27, 2013 every six days
3.1 meters above the ground on a platform located in a city
water well site.
270, from 290 to 200, includes predominant wind direction
from 135 (SE)
2.08 meters
n/a
n/a
8.0 meters
n/a
1.2 meters /Every twelve days (after April 27, 2013 every
six days) / R& P 2025
Arizona State Route 77 runs north - south 0.5 kilometers to
the east, providing six lanes of heavily used arterial routing
with a 2012 ADT of 44,000.
River Road runs east – west 0.5 kilometers to the north, with
a 2012 ADT of 33,414
Yes
Yes

Tucson, AZ 8520

Comments: This is the collocated monitor for Children’s Park NCore PM 2.5 .

38

2015 Ambient Air Monitoring Network Plan

Site Name

CHILDREN’S PARK NCore

Pollutant
Method Code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
Purpose
Site Type
Instrument Manufacturer / Model
Quarterly flow rate Audit dates
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical Lab
Monitor type
Monitor Network Affiliation
Scale
Number of daily observations
Number / Dates of exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height

PM Coarse PM 10 -PM 2.5 (Other)
176
2
86101/ 1
Research support / NCore requirement

Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
schedule / Collocated monitor type
Nearest roads distance & direction to
monitor /ADT

Site meets 40 CFR 58, Appx. A,C,D,E
MSA

Population exposure
R & P / Partisol-Plus 2025 Sampler Pair
3/24 , 9/17
FRM
PDEQ/ PDEQ
PDEQ
SLAMS
NCore
Neighborhood
113
0
0
Every three days
3.1 meters above the ground on a platform located in a city
water well site.
290, from 280 to 210, includes predominant wind direction
from 135 (SE)
2.08 meters
n/a
n/a
8.0 meters
n/a
1.2 m / 1 in 3 days / n/a
Arizona State Route 77 runs north - south 0.5 kilometers to the
east, providing six lanes of heavily used arterial routing with a
2012 ADT of 44,000.
River Road runs east – west 0.5 kilometers to the north, with a
2012 ADT of 33,414
Yes

Tucson, AZ 8520

Comments: The subtraction method for determining the coarse PM fraction was initiated in 2011, using a
matched pair of Partisol- Plus samplers.

39

2015 Ambient Air Monitoring Network Plan

Site Name

CHILDREN’S PARK NCore

Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Monitor Network Affiliation
Scale
Number of daily observations
Number / Dates of exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height

PM 2.5 SPECIATION

Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

Site meets 40 CFR 58, Appx. A,C,D,E
MSA

810
1
Speciated parameters/ 5
Research support for the Chemical Speciation Network (CSN)
Population Exposure
Met One/ Super SASS
Other
Pima County Department of Environmental Quality/ RTP
RTP
SLAMS
CSN Supplemental ; NCore
Neighborhood
101
0
0
Every three days
3 meters above the ground on a platform located in a city
water well site.
290, from 290 to 200, includes predominant wind direction
from 135 (SE)
1.83 meters
n/a
n/a
SASS 5.2 meters
n/a
Collocation is fulfilled by the National NCore network.
Arizona State Route 77 runs north - south 0.5 kilometers to the
east, providing six lanes of heavily used arterial routing with a
2012 ADT of 44,000.
River Road runs east – west 0.5 kilometers to the north, with a
2012 ADT of 33,414
Yes

Tucson, AZ 8520

Comments: Sampling began for PM 2.5 Speciation in 2000.

40

2015 Ambient Air Monitoring Network Plan

Site Name

CHILDREN’S PARK NCore

Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Monitor Network Affiliation
Scale
Number of houly observations
Number / Dates of standard exceedances
in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height

CARBON MONOXIDE

Probe material / Residence time
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

Site meets 40 CFR 58, Appx. A,C,D,E
MSA

554
1
42101/ 1
NAAQS comparison / NCore requirement
Population Exposure
Thermo Scientific / 48i -TLE
FRM
PDEQ / PDEQ
n/a
Special Purpose Monitor
NCore
Neighborhood
8675
0
0
Continuous
4.25 meters above the ground on a shelter in a city water well
site
FEP Teflon/ 11.84 seconds
360
1.70 meters
n/a
n/a
14.0 meters
n/a
n/a
Arizona State Route 77 runs north - south 0.5 kilometers to the
east, providing six lanes of heavily used arterial routing with a
2012 ADT of 44,000.
River Road runs east – west 0.5 kilometers to the north, with a
2012 ADT of 33,414
Yes

Tucson, AZ 8520

Comments: This site began monitoring for Carbon Monoxide in October, 1998.

41

2015 Ambient Air Monitoring Network Plan

Site Name

CHILDREN’S PARK NCore

Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Monitor Network Affiliation
Scale
Number of daily observations
Number / Dates of 8-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height

OZONE

Probe material / Residence time
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
schedule/collocated monitor type
Nearest roads distance & direction to
monitor / ADT

Site meets 40 CFR 58, Appx. A,C,D,E
MSA

047
1
44201/ 1
NAAQS comparison / Maintenance of long term ozone
monitoring at this location
Population Exposure
Thermo Scientific / 49i
FEM
PDEQ/ PDEQ
n/a
SLAMS
NCore
Neighborhood
365
0
One in 1999; One in 2002; One in 2014
Continuous
4.25 meters above the ground on a shelter located in a city
water well site.
FEP Teflon / 5.9 seconds
360
1.73 meters
n/a
n/a
16.4 meters
n/a
n/a
Arizona State Route 77 runs north - south 0.5 kilometers to the
east, providing six lanes of heavily used arterial routing with a
2012 ADT of 44,000.
River Road runs east – west 0.5 kilometers to the north, with a
2012 ADT of 33,414
Yes

Tucson, AZ 8520

Comments: This site began August of 1997 and is a relocation (1.5 kilometers, northeast) of the Pomona
site. This site is representative of a neighborhood scale in the north central region of the air planning area
where ozone levels are generally expected to be high due to the low altitude and the prevailing
southeasterly winds.

42

2015 Ambient Air Monitoring Network Plan

Site Name

CHILDREN’S PARK NCore

Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Monitor Network Affiliation
Scale
Number of hourly observations
Number / Dates of standard exceedances
in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height

NITROGEN DIOXIDE

Probe material / Residence time
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
schedule/collocated monitor type
Nearest roads distance & direction to
monitor / ADT

Site meets 40 CFR 58, Appx. A,C,D,E
MSA

090
1
42602/ 1
NAAQS comparison / Maintenance of long term monitoring at
this location
Highest Concentration
Ecotech / 9841 T
FRM
PDEQ / PDEQ
n/a
Special Purpose
Proposed NCore
Neighborhood
8668
0
0
Continuous
4.25 meters above the ground on a shelter located in a city
water well site
FEP Teflon / 9.19 seconds
360
1.70 meters
n/a
n/a
12.8 meters
n/a
n/a
Arizona State Route 77 runs north - south 0.5 kilometers to the
east, providing six lanes of heavily used arterial routing with a
2012 ADT of 44,000.
River Road runs east – west 0.5 kilometers to the north, with a
2012 ADT of 33,414
Yes

Tucson, AZ 8520

Comments: The site began monitoring for Nitrogen Dioxide in May, 1998, and is a relocation
(1.5 kilometers, northeast) of the Pomona site.

43

2015 Ambient Air Monitoring Network Plan

Site Name

CHILDREN’S PARK NCore

Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Monitor Network Affiliation
Scale
Number of daily observations
Number / Dates of standard exceedances
in 2015
Historical exceedances
Current Sampling frequency / season
Probe height

REACTIVE OXIDES OF NITROGEN (NO Y )

Probe material / Residence time
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
schedule/collocated monitor type
Nearest roads distance & direction to
monitor / ADT

Site meets 40 CFR 58, Appx. A,C,D,E
MSA

574/ 674
1
42600/ 1
Research support / Comply with NCore requirements
Population Exposure
Thermo Scientific / 42i - Y
n/a
PDEQ / PDEQ
n/a
SLAMS
NCore
neighborhood
8601
0
0
Continuous
10.0 meters above the ground on a shelter located in a city
water well site
FEP Teflon / 0.6 seconds to converter; 6.1 seconds from
converter to analyzer.
360
0.36 meters probe to mast; 7.31 meters probe to shelter
n/a
n/a
12.8 meters, horizontal, inlet well above tree tops
n/a
n/a
Arizona State Route 77 runs north - south 0.5 kilometers to the
east, providing six lanes of heavily used arterial routing with a
2012 ADT of 44,000.
River Road runs east – west 0.5 kilometers to the north, with a
2012 ADT of 33,414
Yes

Tucson, AZ 8520

Comments: The site began monitoring for reactive oxides of nitrogen in October, 2010 for the NCore site
requirements, using a Thermo 42i-y instrument with remote converter mounted at the requisite 10 meters.

44

2015 Ambient Air Monitoring Network Plan

Site Name

CHILDREN’S PARK NCore

Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Monitor Network Affiliation
Scale
Number of daily observations
Number / Dates of 1-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height

SULFUR DIOXIDE

Probe material / Residence time
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

Site meets 40 CFR 58, Appx. A,C,D,E
MSA

560
1
42401/ 1
NAAQS comparison / Comply with NCore requirements
Population Exposure
Thermo Scientific / 43i - TLE
FEM
PDEQ / PDEQ
n/a
SLAMS
NCore
neighborhood
8569
0
0
Continuous
4.25 meters above the ground on a shelter located in a city
water well site
FEP Teflon / 12.1 seconds
360
1.70 meters
n/a
n/a
14.0 meters
n/a
n/a
Arizona State Route 77 runs north - south 0.5 kilometers to the
east, providing six lanes of heavily used arterial routing with a
2012 ADT of 44,000.
River Road runs east – west 0.5 kilometers to the north, with a
2012 ADT of 33,414
Yes

Tucson, AZ 8520

Comments: Sulfur Dioxide sampling began October 1, 2010 to conform to NCore site requirements.

45

2015 Ambient Air Monitoring Network Plan

Site Name

CHILDREN’S PARK NCore

Pollutant
Method Code
Number of monitors
Parameter code / POC
Basic monitoring objective/ Statement of
Purpose
Site Type

LEAD Primary

Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical Lab
Analytical Instrument / Method
Monitor type
Monitor Network Affiliation
Scale
Number of daily observations
Number / Dates of rolling three month
average standard exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

Site meets 40 CFR 58, Appx. A,C,D,E
MSA

110 ICAP spectra (ICP-MS)
2
14129/ 1
NAAQS comparison / Comply with NCore requirements
Population Exposure
Non- Source -Oriented
Tisch / Hi –Vol Plus
n/a
PDEQ/ PDEQ
Pima County Regional Wastewater Reclamation Department
(CRAO)
ICAP Spectra (ICP-MS) / EQL-0510-191
SLAMS
Proposed NCore
Neighborhood
59
0
0
Every six days
2.0 meters
300, from 270 to 210, includes predominant wind direction
from 135 (SE)
n/a
n/a
n/a
8.4 meters
n/a
2.3 m / 6 days/ Tisch Hi –Vol Plus
Arizona State Route 77 runs north - south 0.5 kilometers to the
east, providing six lanes of heavily used arterial routing with a
2012 ADT of 44,000.
River Road runs east – west 0.5 kilometers to the north, with a
2012 ADT of 33,414
Yes

Tucson, AZ 8520

Comments: Lead sampling began February 27, 2012.

46

2015 Ambient Air Monitoring Network Plan

Site Name

CHILDREN’S PARK NCore

Pollutant
Method Code
Number of monitors
Parameter code / POC
Basic monitoring objective/ Statement of
Purpose
Site Type

LEAD QA Collocated

Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical Lab
Analytical Instrument / Method
Monitor type
Monitor Network Affiliation
Scale
Number of daily observations
Number / Dates of rolling three month
average standard exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

Site meets 40 CFR 58, Appx. A,C,D,E
MSA

110 ICAP spectra (ICP-MS)
2
14129 (POC 2 as of March, 2014)
Collocated monitor / Comply with NCore requirements
Population Exposure
Non- Source -Oriented
Tisch Hi –Vol Plus
n/a
PDEQ/ PDEQ
Pima County Regional Wastewater Reclamation Department
(CRAO)
ICAP Spectra (ICP-MS) / EQL -0510-191
SLAMS
Proposed NCore
Neighborhood
52
0
0
Every twelve days; Every six days starting March 7, 2015
2.0 m
290, from 270 to 200, includes predominant wind direction
from 135 (SE)
n/a
n/a
n/a
6.6 meters
n/a
2.3 m / 12 days/ Tisch Hi –Vol Plus
Arizona State Route 77 runs north - south 0.5 kilometers to the
east, providing six lanes of heavily used arterial routing with a
2012 ADT of 44,000.
River Road runs east – west 0.5 kilometers to the north, with a
2012 ADT of 33,414
Yes

Tucson, AZ 8520

Comments: Lead sampling began February 27, 2012.

47

2015 Ambient Air Monitoring Network Plan

Site Name

CHILDREN’S PARK NCore

Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model

METEOROLOGICAL DATA
061, 040, 011
4
61103, 61104, 62101, 62201
Research support / Source determination for criteria pollutants

FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of daily observations
Number / Dates of 24-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors /
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

Site meets 40 CFR 58, Appx. A,C,D,E
MSA

n/a
WD/WS –MET ONE 50.5; Temp/RH – VAISALA
HMP45AC
n/a
PDEQ, PDEQ
n/a
n/a
n/a
356
n/a
n/a
continuous
WD/WS – 10m ; Temp/RH – 4.25m
360
n/a
n/a
n/a
WD/WS – 16.5m ; Temp/RH – 12.8m
n/a
n/a
Arizona State Route 77 runs north - south 0.5 kilometers to the
east, providing six lanes of heavily used arterial routing with a
2012 ADT of 44,000.
River Road runs east – west 0.5 kilometers to the north, with a
2012 ADT of 33,414
YES

Tucson, AZ 8520

48

2015 Ambient Air Monitoring Network Plan

GREEN VALLEY: AQS # 040191030

Site Description
Site Name

GREEN VALLEY

AQS ID
Address
Latitude / Longitude
Elevation
Surrounding landscape
Location description

040191030
601 N. La Canada Drive, Green Valley, AZ
31.87952 / -110.996440
2910
Dirt, sparse desert vegetation
This site is situated in a residential / commercial area. Open pit
copper mines and tailings ponds are located four kilometers to the
west of the community.

49

2015 Ambient Air Monitoring Network Plan

Monitoring Information
Site Name
Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of houly observations
Number / Dates of 24-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors /
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

GREEN VALLEY
PM 10
079
1
81102/1
NAAQS comparison / Provide air pollution data to the public
in a timely manner
Population Exposure
Thermo Scientific /TEOM 1400AB and Met One/ BAM 1020
FEM
PDEQ / PDEQ
n/a
Special Purpose
Neighborhood
8283
0
April 9, 2013; July 25, 2014.
Continuous
4.25 meters above the ground of the Pima County Government
Center.
360
1.63 meters
n/a
n/a
12.5 meters
n/a
n/a
100 meters west of La Canada with a 2015 ADT of 14,332

Site meets 40 CFR 58, Appx. A,C,D,E

0.5 kilometers west of Interstate 19 with a 2011 ADT of
31,000
Yes

CBSA

Green Valley, AZ 46060

Comments: This site is fifty kilometers south of Downtown Tucson in the retirement community of
Green Valley. PM 10 monitoring commenced in September 1989 at the established TSP site there.
ASARCO and Freeport-McMoRan operate several open pit mines and tailings ponds just west of the
community. The monitoring objective is to monitor the population exposure to this potentially significant
source of airborne particulates. The monitor was relocated in February 2001, approximately 1 kilometer
north of the original Esperanza site, to the Pima County Government Center at 601 N. La Canada Drive.
The new site is considered a continuation of the original site. PM 10 levels were below the health
standards in the years 1989 through 2012. In 2013, there was one exceedance resulting from an intense
regional dust storm that may be considered as an Exceptional Event, dependent on approval from EPA.

50

2015 Ambient Air Monitoring Network Plan

Site Name
Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of hourly observations
Number / Dates of 24-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors /
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

GREEN VALLEY
PM 2.5
733
1
88501/3
Provide air pollution data to the public in a timely manner /
Population Exposure
Population Exposure
Met-One / BAM 1020
other
PDEQ / PDEQ
n/a
Special Purpose
Neighborhood
8606
0
0
Continuous
4.8 meters above the ground on a shelter
360
2.03 meters
n/a
n/a
10.7 meters
n/a
n/a
100 meters west of La Canada with a 2015 ADT of 14,332

0.5 kilometers west of Interstate 19 with a 2011 ADT of
31,000
Annual No

Suitable for comparison to PM 2.5
NAAQS
Site meets 40 CFR 58, Appx. A,C,D,E

Yes

CBSA

Green Valley, AZ 46060

Comments: This site is fifty kilometers south of Downtown Tucson in the retirement community of
Green Valley. This monitor was initially installed in May of 2000 as part of the Environmental
Monitoring for Public Access and Community Tracking (EMPACT) program. Pima County began
reporting the PM 2.5 data to EPA July, 2003.

51

2015 Ambient Air Monitoring Network Plan

Site Name
Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of daily observations
Number / Dates of 8-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Probe material / Residence time
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

GREEN VALLEY
OZONE
047
1
44201/1
NAAQS comparison / Provide air pollution data to the public
in a timely manner
Population Exposure
Thermo Scientific / 49i
FEM
PDEQ / PDEQ
n/a
Special Purpose
Neighborhood
359
0
0
Continuous
3.1 meters above the ground on a shelter
FEP Teflon / 7.95 seconds
360
1.2 meters
n/a
n/a
8.5 meters
n/a
n/a
100 meters west of La Canada with a 2015 ADT of 14,332

Site meets 40 CFR 58, Appx. A,C,D,E

0.5 kilometers west of Interstate 19 with a 2011 ADT of
31,000
Yes

CBSA

Green Valley, AZ 46060

Comments: This site is fifty kilometers south of Downtown Tucson in the retirement community of
Green Valley. This site was initially established in April of 2002 as part of the Environmental Monitoring
for Public Access and Community Tracking (EMPACT) program. Pima County began reporting the ozone
data to EPA July, 2003.

52

2015 Ambient Air Monitoring Network Plan

CORONA de TUCSON: AQS # 040190008

Site Description
Site Name

CORONA de TUCSON

AQS ID
Address
Latitude / Longitude
Elevation
Surrounding landscape
Location description

040190008
22001 S. Houghton Road, Tucson, AZ
32.00474 / -110.79260
3078
Gravel within enclosure; dirt, sparse desert vegetation surrounding
This site is situated in an undisturbed natural desert area.

53

2015 Ambient Air Monitoring Network Plan

Monitoring Information
Site Name

CORONA de TUCSON

Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer/Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of daily observations
Number / Dates of 24-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT
Site meets 40 CFR 58, Appx. A,C,D,E
MSA

PM 10
126
1
81102/ 1
NAAQS comparison / Upwind Background
Upwind Background
R&P 2000
FRM
PDEQ / PDEQ
PDEQ
SLAMS
Regional
59
0
0
Every six days
2.08 meters
360
n/a
n/a
n/a
23.4 meters
n/a
n/a
1.6 kilometers west of Houghton Road with a 2015 ADT
of 11,752
Yes

Tucson, AZ 8520

Comments: This site is the only regional scale monitor in the network. PM 10 sampling was started here in
September 1988, in conjunction with existing total suspended particulates (TSP) sampling. This site
exhibits the lowest network concentrations. TSP sampling was discontinued in May 1989. Hi - Vol
sampling for PM 10 was substituted with dichotomous sampling during the last quarter of 1989 in support
of the state sponsored Tucson PM 10 Source Apportionment Study. Hi - Vol PM 10 sampling resumed in
January 1990. Low -Vol PM 10 R& P 2000 sampling began in March, 2006.

54

2015 Ambient Air Monitoring Network Plan

ORANGE GROVE: AQS # 040190011

Site Description
Site Name

ORANGE GROVE

AQS ID
Address
Latitude / Longitude
Elevation
Surrounding landscape
Location description

040190011
3401 W. Orange Grove Road, Tucson, AZ
32.32255 / -111.037700
2234
Gravel in fenced compound, dirt road shoulders
This site is situated in a residential area with light commerce and
industry. There is an asphalt batch plant and redi-mix concrete
operations with a large gravel pit less than three kilometers to the
west of the site in the Santa Cruz River bed area.

55

2015 Ambient Air Monitoring Network Plan

Monitoring Information
Site Name

ORANGE GROVE

Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective /
Statement of purpose
Site type
Instrument Manufacturer/Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of daily observations
Number / Dates of 24-hour standard
exceedances in 2015
Historical exceedances

PM 10 Primary
127
2
81102/ 2
NAAQS Comparison / Highest Concentration

Current Sampling frequency / Season
Probe height
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors
/ Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

Every day

Site meets 40 CFR 58, Appx.
A,C,D,E
MSA

Highest Concentration
R&P 2025 Sequential
FRM
PDEQ /PDEQ
PDEQ
SLAMS
Neighborhood
361
0
Exceedances of the 24 – hour standard: two in 1988, four in 1999, one
in 2002, one in 2003, one in 2009 ; one in 2014
2.2 meters above the ground in a city water well site
360
n/a
n/a
n/a
19.2 meters
n/a
1.2 meters /Every day; reported every 6th day/ R& P 2025 Sequential
37 meters west of Camino de la Tierra with a 2011 ADT of 7,894 and
70 meters south of Orange Grove Road with a 2013 ADT of 37,622
2 kilometers east of Interstate 10 with a 2012 ADT of 110,000
Yes

Tucson, AZ 8520

Comments: Established in February 1985, this site is the oldest of the PM 10 monitoring sites in the
network. Orange Grove was chosen as the initial PM 10 monitoring site and the design value site for Group
II in the Tucson air planning area based on historically high TSP data. This neighborhood scale site is
located near the confluence of the Santa Cruz, Rillito, and Canada del Oro Rivers in the Tucson Valley.
This site is situated near the freeway and railway tracks, therefore high PM 10 values are expected here.
Dichotomous sampling was started at this site in July of 1993. The dichotomous ran in co-location with a
HI-VOL- SA/1200 model from 1993 to 1996. The site was converted to dichotomous only operations on
October 1, 1996 continuing until December 1998. Hi-Vol sampling resumed in January 1999, but was
replaced with co-located low volume sequential samplers in 2004.

56

2015 Ambient Air Monitoring Network Plan

Site Name

ORANGE GROVE

Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement
of purpose
Site type
Instrument Manufacturer/Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of daily observations
Number / Dates of 24-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors /
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

PM 10 Collocated
127
2
81102 (POC 4 as of March, 2014)
Collocation information

Site meets 40 CFR 58, Appx. A,C,D,E
MSA

Highest Concentration
R&P 2025 Sequential
FRM
PDEQ /PDEQ
PDEQ
SLAMS
Neighborhood
313
0
One in 2002; one in 2009; one in 2014
Every six days

2.2 meters above the ground in a city water well site
360
n/a
n/a
n/a
19.2 meters
n/a
1.2 meters /Every day ; reported every 6th day/ R& P 2025 Sequential
37 meters west of Camino de la Tierra with a 2011 ADT of 7,894
and 70 meters south of Orange Grove Road with a 2013 ADT of
37,622
2 kilometers east of Interstate 10 with a 2012 ADT of 110,000
Yes

Tucson, AZ 8520

57

2015 Ambient Air Monitoring Network Plan

Site Name
Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of daily observations
Number / Dates of 24-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors /
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

ORANGE GROVE
PM 2.5
118
1
88101/ 1
NAAQS Comparison / Highest expected concentration
Population Exposure
R&P Partisol-Plus 2025
FRM
PDEQ / PDEQ
PDEQ
SLAMS
Neighborhood
116
0
0
Every three days
2.1 meters above the ground in a city water well site
360
n/a
n/a
n/a
20.3 meters
n/a
n/a
37 meters west of Camino de la Tierra with a 2011 ADT of
7,894 and 70 meters south of Orange Grove Road with a 2013
ADT of 37,622
2 kilometers east of Interstate 10 with a 2012 ADT of 110,000

Suitable for comparison to PM 2.5 Annual Yes
NAAQS
Site meets 40 CFR 58, Appx. A,C,D,E
Yes
MSA
Tucson, AZ 8520

Comments: PM 2.5 sampling began at this neighborhood scale site in January, 1999. It is located near the
confluence of the Santa Cruz, Rillito and Canada del Oro Rivers in the Tucson Valley, toward the
northwest end of the air planning area. The site is situated near a freeway and railroad tracks.

58

2015 Ambient Air Monitoring Network Plan

SOUTH TUCSON: AQS # 040191001

Site Description
Site Name

SOUTH TUCSON

AQS ID
Address
Latitude / Longitude
Elevation
Surrounding landscape

040191001
1601 S. 6th Avenue, South Tucson, AZ
32.20195 / -110.967900
2420
Primarily paved parking lots; gravel and desert landscaping
surrounding building.
This site is situated in a dense residential / commercial area. There
are numerous unpaved alleys and lots in the vicinity.

Location description

Comments: From January 1985 to September 1988 this site approached or exceeded TSP standards.
PM 10 sampling began here in September 1988. On March 8, 1993, the samplers were relocated from the
original site to the new South Tucson Governmental Complex, which is less than two blocks north and
across S. 6th Avenue. Levels at this location are representative of area - wide emissions patterns with high
population exposure. The annual means for 1989 through 1999 were below the health standard. The 24 hour NAAQS was exceeded twice in 1999 and 2002. Two co-located PM 10 samplers were operational at
this site from June 1991 to June 1999. Co-location of the PM 10 samplers was discontinued when a third
sampler was added and every day sampling began on June 23, 1999. In March, 2004, the Hi -Vol samplers
were replaced with co-located Low –Vol sequential samplers.

59

2015 Ambient Air Monitoring Network Plan

Monitoring Information
Site Name
Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of daily observations
Number / Dates of 24-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT
Site meets 40 CFR 58, Appx. A,C,D,E
MSA

SOUTH TUCSON
PM 10 Primary
127
2
81102 /1
NAAQS Comparison / Population Exposure
Population Exposure
R&P 2025 Sequential
FRM
PDEQ/ PDEQ
PDEQ
SLAMS
Neighborhood
359
0
Exceedances of the 24 – hour standard: two in 1999; two in
2002; one in 2009; two in 2013
Every day
6.9 meters above the ground on the roof of the South Tucson
Governmental Complex Building.
360
2.2 meters
n/a
n/a
6.7 meters
n/a
1.7 meters/ Every day; reported every 6th day/ R&P 2025
Sequential
41 meters east of South 6th Avenue with a 2012 ADT of
15,000
528 meters south of 22nd Street with a 2012 ADT of 34,000
Yes

Tucson, AZ 8520

60

2015 Ambient Air Monitoring Network Plan

Site Name
Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of daily observations
Number / Dates of 24-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT
Site meets 40 CFR 58, Appx. A,C,D,E
MSA

SOUTH TUCSON
PM 10 Collocated
127
2
81102 (POC 2 as of March, 2014)
Collocation sampling information
Population Exposure
R&P 2025 Sequential
FRM
PDEQ/ PDEQ
PDEQ
SLAMS
Neighborhood
312
0
One in 1999; one in 2013; one in 2014
Every six days
6.9 meters above the ground on the roof of the South Tucson
Governmental Complex Building.
360
2.2 meters
n/a
n/a
6.7 meters
n/a
1.7 meters/ Every day; reported every 6th day/ R&P 2025
Sequential
41 meters east of South 6th Avenue with a 2012 ADT of
15,000
528 meters south of 22nd Street with a 2012 ADT of 34,000
Yes

Tucson, AZ 8520

61

2015 Ambient Air Monitoring Network Plan

SANTA CLARA SCHOOL: AQS# 040191026

Site Description
Site Name

SANTA CLARA SCHOOL

AQS ID
Address
Latitude / Longitude
Elevation
Surrounding landscape
Location description

040191026
6910 S. Santa Clara Avenue, Tucson, AZ
32.125950 / -110.982600
2540
Large flat roof, paved parking lots and streets, grass playground.
This site is situated in a Southwest Tucson residential district.

Comments: This site is located south of Interstate 10 and east of Interstate 19 and provides a
representative neighborhood scale site on Tucson’s south side. Being near the fringe of the city limits, this
site should track transport values that develop with a southerly wind from a combination of desert,
agricultural land, and silt flood plain that is found on the Tohono O’Odham Indian Reservation (San
Xavier district) 500 meters south of the site. The Hi- Vol sampler was replaced in April, 2006, with a
Low- Vol sampler.

62

2015 Ambient Air Monitoring Network Plan

Monitoring Information
Site Name
Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of daily observations
Number / Dates of 24-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors /
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

Site meets 40 CFR 58, Appx. A,C,D,E
MSA

SANTA CLARA SCHOOL
PM 10
126
1
81102 /1
NAAQS Comparison / Population Exposure
Population Exposure
R&P 2000
FRM
PDEQ/ PDEQ
PDEQ
Special Purpose
Neighborhood
57
0
Exceedances of the 24 – hour standard: One on 10/27/2008
Every six days
6.45 meters above the ground on the roof of the Santa Clara
Elementary School.
360
2.01 meters (to roof)
n/a
n/a
23.9 meters
n/a
n/a
450 meters east of Interstate 19 with a 2012 ADT of 38,000
800 meters south of Valencia Road with a 2013 ADT of
48,642
Yes

Tucson, AZ 8520

63

2015 Ambient Air Monitoring Network Plan

TANGERINE: AQS # 040191018

Previous

Current

Site Description
Site Name

TANGERINE

AQS ID
Address
Latitude / Longitude
Elevation
Surrounding landscape

040191018
12101 N. Camino de Oeste, Tucson, AZ
32.425250 / -111.063500
2638
Dirt, sparse desert vegetation to the east; high density, tri-level and multi-unit
apartments directly west of station.
This site has been situated in a relatively undisturbed natural desert area for most
of its existence, but residential development in recent years have been built to
within 35 meters to the west, and low density residential developments are
encroaching from the south, east and north to within 3 kilometers to 5 kilometers.

Location description

64

2015 Ambient Air Monitoring Network Plan

Monitoring Information
Site Name
Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of daily observations
Number / Dates of 24-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors /
schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT
Site meets 40 CFR 58, Appx. A,C,D,E
MSA

TANGERINE
PM 10
126
1
81102/ 1
NAAQS Comparison / General Background *
General Background
R&P 2000
FRM
PDEQ/ PDEQ
PDEQ
Special Purpose
Urban
57
0
0
Every six days
4.5 meters above the ground on a shelter on Tucson’s far
northwest side
360
2.01 meters (to roof)
n/a
n/a
6.4 meters
n/a
n/a
Tangerine Road runs approximately east – west 70 meters
south of the site with a 2011 ADT of 5,000
Yes

Tucson, AZ 8520

* See comment on page 3, PDEQ’s anticipated modifications to network in 2016
Comments: The primary objective of this site is to assess background concentrations and to assess
transport impact from outlying sources during exceptional wind events. As part of the urban haze/
visibility study, dichotomous samplers were installed at this site in July 1993. PM 10 data from these
samplers was used to supplement the existing PM 10 network from October 1996 to December 1998, when
the dichotomous samplers were relocated and a Hi-Vol sampler was installed to continue PM 10
monitoring. In 2005, the Hi-Vol PM 10 sampler was replaced with a Low –Vol R& P 2000 sampler.

65

2015 Ambient Air Monitoring Network Plan

Site Name
Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of daily observations
Number / Dates of 8-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Probe material / Residence time
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT
Site meets 40 CFR 58, Appx. A,C,D,E
MSA

TANGERINE
OZONE
047
1
44201 / 1
NAAQS comparison / Highest Concentration *
Highest Concentration
Thermo Scientific / 49c
FEM
PDEQ/ PDEQ
n/a
Special Purpose
Urban
364
0
One in 2002; One in 2009; One in 2014
Continuous
3.75 meters above the ground on a shelter on Tucson’s far
northwest side.
FEP Teflon / 8.5 seconds
360
1.24 meters
n/a
n/a
8.3 meters
n/a
n/a
Tangerine Road runs approximately east – west 70 meters
south of the site with a 2011 ADT of 5,000
Yes

Tucson, AZ 8520

* See comment on page 3, PDEQ’s anticipated modifications to network in 2016
Comments: Tangerine was established in November 1989. Ozone concentrations at this site have been
the highest in the network on occasion. This may be due to the prevailing southeasterly winds
transporting ozone from the urban area. Concentrations remain high well into the night and early morning.

66

2015 Ambient Air Monitoring Network Plan

GERONIMO: AQS # 040191113

Site Description
Site Name

GERONIMO

AQS ID
Address
Latitude / Longitude
Elevation
Surrounding landscape
Location description

040191113
2498 N. Geronimo Tucson, AZ
32.251840 / -110.965300
2398
Dirt, dead shrubs, unpaved road shoulders
This site is situated in a residential area in a City of Tucson water
well site.

67

2015 Ambient Air Monitoring Network Plan

Monitoring Information
Site Name
Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of hourly observations
Number / Dates of 24-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

Site meets 40 CFR 58, Appx. A,C,D,E
MSA

GERONIMO
PM 10
122
1
81102 / 1
NAAQS Comparison / Provide air pollution data to the public
in a timely manner
Population Exposure
Met One / BAM 1020
FEM
PDEQ / PDEQ
n/a
Special Purpose
Neighborhood
8595
0
One on 7/22/2009; one on 04/09/2013; one on 07/25/2014
Continuous
4.6m
360
1.83 meters
n/a
n/a
9.3 meters
n/a
n/a
154.8 meters north of Grant Road with a 2014 ADT 35,894
617.6 meters east of Stone Avenue with a 2012 ADT 21,000
397.5 meters west of North 1st Avenue with a 2011 ADT
34,000
Yes

Tucson, AZ 8520

Comments: This monitor was initially installed in July 1, 2007 for Air Quality Index reporting using a
continuous monitor. This is a Special Purpose site situated in a residential area, monitoring for population
exposure. There was one exceedance on April 9, 2013 that may be considered as an Exceptional Event
dependant on approval from EPA.

68

2015 Ambient Air Monitoring Network Plan

Site Name
Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of hourly observations
Number / Dates of 24-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

GERONIMO
PM 2.5
733
1
88501 /3
Provide air pollution data to the public in a timely manner /
Population Exposure
Population Exposure
Met One / BAM 1020
other
PDEQ/ PDEQ
n/a
Special Purpose
Neighborhood
8373
0
0
Continuous
4.6 meters
360
1.98 meters
n/a
n/a
9.4 meters
n/a
n/a
154.8 meters north of Grant Road with a 2014 ADT 35,894
617.6 meters east of Stone Avenue with a 2012 ADT 21,000

397.5 meters west of North 1st Avenue with a 2011 ADT
34,000
Annual No

Suitable for comparison to PM 2.5
NAAQS
Site meets 40 CFR 58, Appx. A,C,D,E
MSA

Yes

Tucson, AZ 8520

Comments: This monitor was initially installed in July of 2001 for Air Quality Index reporting using a
continuous monitor. Pima County began reporting the PM 2.5 data to EPA July, 2003. This is a Special
Purpose site situated in a residential area, monitoring for population exposure.

69

2015 Ambient Air Monitoring Network Plan

ROSE ELEMENTARY: AQS # 040191032

Site Description
Site Name

ROSE ELEMENTARY

AQS ID
Address
Latitude / Longitude
Elevation
Surrounding landscape
Location description

040191032
710 W. Michigan, Tucson, AZ
32.173 / -110.980115
2438
Grass playground
The site is located in a residential neighborhood with light
commercial enterprises. The Santa Cruz River, with several sand
and gravel operations, parallels the interstate one kilometer to the
west.

70

2015 Ambient Air Monitoring Network Plan

Monitoring Information
Site Name
Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of hourly observations
Number / Dates of 24-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

Suitable for comparison to PM 2.5 Annual
NAAQS
Site meets 40 CFR 58, Appx. A,C,D,E
MSA

ROSE ELEMENTARY
PM 2.5
733
1
88501 /3
Provide air pollution data to the public in a timely manner /
Population Exposure
Population Exposure
Met One / BAM 1020
other
PDEQ / PDEQ
n/a
Special Purpose
Neighborhood
8401
0
0
Continuous
4.9 meters above the ground on the roof of a shelter located
on the grounds of Rose Elementary School
360
2.39 meters
n/a
n/a
11.8 meters
n/a
n/a
12th Avenue 235 meters to the east with a 2011 ADT of
22,000
Ajo Way 528 meters to the north with a 2012 ADT of 28,
000
Interstate 19 runs north-south half a kilometer to the west
with a 2012 ADT 80,000
No
Yes

Tucson, AZ 8520

Comments: This monitor was initially installed in October of 2000 as part of the Environmental
Monitoring for Public Access and Community Tracking (EMPACT) program. This area was identified as
having higher than normal number of pediatric asthma cases. Pima County began reporting the PM 2.5 data
to EPA July, 2003.

71

2015 Ambient Air Monitoring Network Plan

Site Name

ROSE ELEMENTARY

Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of daily observations
Number / Dates of 8-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height

OZONE

Probe material / Residence time
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

Site meets 40 CFR 58, Appx. A,C,D,E
MSA

047
1
44201/ 1
NAAQS comparison / Provide air pollution data to the
public in a timely manner
Population Exposure
Thermo Scientific / 49i
FEM
PDEQ/PDEQ
n/a
Special Purpose
Neighborhood
357
0
0
Continuous
4.1 meters above the ground on the roof of a shelter located
on the grounds of Rose Elementary School.
FEP Teflon / 9.5 seconds
360
1.63 meters
n/a
n/a
9.4 meters
n/a
n/a
12th Avenue 235 meters to the east with a 2011 ADT of
22,000
Ajo Way 528 meters to the north with a 2012 ADT of 28,
000
Interstate 19 runs north-south half a kilometer to the west
with a 2012 ADT 80,000
Yes

Tucson, AZ 8520

Comments: This site was initially established in October of 2000 as part of the Environmental
Monitoring for Public Access and Community Tracking (EMPACT) program. This area was identified as
having higher than normal number of pediatric asthma cases. Pima County began reporting the ozone data
to EPA July, 2003.

72

2015 Ambient Air Monitoring Network Plan

COACHLINE: AQS # 040191034

Site Description
Site Name

COACHLINE

AQS ID
Address
Latitude / Longitude
Elevation
Surrounding landscape
Location description

040191034
9597 N. Coachline, Tucson, AZ
32.380820 / -111.127160
2104
Dirt within walled compound, residential neighborhood
The site is situated in a residential neighborhood. The normally dry Santa Cruz
River runs northwest between the Interstate and the neighborhood and contributes
to airborne dust through previous deposition of fine clay soils throughout the
floodplain. This area has previously been used for farming and ranching, and sand
and gravel operations are still in operation five to ten kilometers upstream to the
southwest.

73

2015 Ambient Air Monitoring Network Plan

Monitoring Information
Site Name
Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of hourly observations
Number / Dates of 24-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

COACHLINE
PM 2.5
733
1
88501/ 3
Provide air pollution data to the public in a timely manner /
Population Exposure
Population Exposure
Met One / BAM 1020
Other
PDEQ / PDEQ
n/a
Special Purpose
Neighborhood
8109
0
0
Continuous
4.9 meters above the ground on a shelter on Tucson’s far
northwest side
280, from 250 to 170, includes predominant wind direction
from 135 (SE)
2.39 meters
n/a
9.41 meters
5.0 meters
n/a
n/a
approximately 1.25 kilometers west of Interstate 10 with a
2012 ADT of 77,000
.5 kilometer north of Silverbell Road 2013 ADT of 16,994

Suitable for comparison to PM 2.5 Annual No
NAAQS
Site meets 40 CFR 58, Appx. A,C,D,E
Yes
MSA
Tucson, AZ 8520

Comments: This monitor was initially installed in March of 2001 as part of the Environmental
Monitoring for Public Access and Community Tracking (EMPACT) program. This area was identified as
having higher than normal number of pediatric asthma cases. Pima County began reporting the PM 2.5 data
to EPA July, 2003.

74

2015 Ambient Air Monitoring Network Plan

Site Name
Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer/Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of daily observations
Number / Dates of 8-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Probe material / Residence time
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT
Site meets 40 CFR 58, Appx. A,C,D,E
MSA

COACHLINE
OZONE
047
1
44201 / 1
NAAQS comparison / Provide air pollution data to the public
in a timely manner
Population Exposure
Thermo Scientific / 49i
FEM
PDEQ / PDEQ
n/a
Special Purpose
Neighborhood
365
0
0
Continuous
3.1 meters above the ground on a shelter on Tucson’s far
northwest side
FEP Teflon / 9.3 seconds
310, from 230 to 180, includes predominant wind direction
from 135 (SE)
1.1 meters
n/a
n/a
5.3 meters
n/a
n/a
approximately 1.25 kilometers west of Interstate 10 with a
2012 ADT of 77,000
.5 kilometer north of Silverbell Road 2013 ADT of 16,994
Yes

Tucson, AZ 8520

Comments: This site was initially established in April of 2001 as part of the Environmental Monitoring
for Public Access and Community Tracking (EMPACT) program. This area was identified as having
higher than normal number of pediatric asthma cases. Pima County began reporting the ozone data to EPA
July, 2003.

75

2015 Ambient Air Monitoring Network Plan

22ND STREET & CRAYCROFT: AQS # 040191011

Site Description
ND

Site Name

22

STREET & CRAYCROFT

AQS ID
Address
Latitude / Longitude
Elevation
Surrounding landscape
Location description

040191011/ 1
1237 S. Beverly Avenue, Tucson, AZ
32.204420 / -110.878067
2582
Dirt, ephemeral weeds
This site is situated in a predominately residential eastside area with commercial
activity lining nearby arterial routes. There is a large covered water reservoir north
of the location.

76

2015 Ambient Air Monitoring Network Plan

Monitoring Information
Site Name
Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of hourly observations
Number / Dates of standard exceedances
in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Probe material / Residence time
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT
Site meets 40 CFR 58, Appx. A,C,D,E
MSA

22ND STREET & CRAYCROFT
CARBON MONOXIDE
158
1
42101 /1
NAAQS comparison / Population Exposure
Population Exposure
Horiba / APMA370
FRM
PDEQ / PDEQ
n/a
SLAMS
Neighborhood
8646
0
0
Continuous
4.1 meters above the ground on the roof of a shelter located in
a city water well site.
FEP Teflon / 5.3 seconds
360
1.2 meters
n/a
n/a
22.0 meters
n/a
n/a
260 meters west is Craycroft Road with a 2012 ADT of
34,000
260 meters north is 22nd Street with a 2012 ADT of 48,000
Yes

Tucson, AZ 8520

Comments: This site is one of the oldest in the monitoring network, originally established in 1973, and
has operated continuously to the present.

77

2015 Ambient Air Monitoring Network Plan

Site Name
Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of daily observations
Number / Dates of 8-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Probe material / Residence time
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT
Site meets 40 CFR 58, Appx. A,C,D,E
MSA

22ND STREET & CRAYCROFT
OZONE
047
1
44201 /1
NAAQS comparison / Maintenance of long term monitoring at
this location
Population Exposure
Thermo Scientific / 49i
FEM
PDEQ / PDEQ
n/a
SLAMS
Neighborhood
362
0
One in 1997, 1999, 2002, 2011
Continuous
4.1 meters above the ground on the roof of a shelter located in
a city water well site.
FEP Teflon / 8.1 seconds
360
1.2 meters
n/a
n/a
22.0 meters
n/a
n/a
260 meters west is Craycroft Road with a 2012 ADT of
34,000
260 meters north is 22nd Street with a 2012 ADT of 48,000
Yes

Tucson, AZ 8520

Comments: This site is one of the oldest in the monitoring network, originally established in 1973, and
operated continuously to the present.

78

2015 Ambient Air Monitoring Network Plan

Site Name
Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of hourly observations
Number / Dates of standard exceedances
in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Probe material / Residence time
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT
Site meets 40 CFR 58, Appx. A,C,D,E
MSA

22ND STREET & CRAYCROFT
NITROGEN DIOXIDE
157
1
42602 /1
NAAQS comparison / Maintenance of long term monitoring at
this location
Population Exposure
Horiba / APNA -370 and Thermo Scientific / 49i
FRM
PDEQ / PDEQ
n/a
SLAMS
Neighborhood
8513
0
0
Continuous
4.1 meters above the ground on the roof of a shelter located in
a city water well site
FEP Teflon / 7.5 seconds
360
1.2 meters
n/a
n/a
22.0 meters
n/a
n/a
260 meters west is Craycroft Road with a 2012 ADT of
34,000
260 meters north is 22nd Street with a 2012 ADT of 48,000
Yes

Tucson, AZ 8520

Comments: This site is one of the oldest in the monitoring network, originally established in 1973, and
operated continuously to the present.

79

2015 Ambient Air Monitoring Network Plan

22ND STREET & ALVERNON: AQS # 040191014

Site Description
ND

Site Name

22

STREET & ALVERNON

AQS ID
Address
Latitude / Longitude
Elevation
Surrounding landscape
Location description

040191014
3895 E. 22nd Street, Tucson, AZ
32.207390 / -110.910650
2516
Gravel in walled compound, paved streets and sidewalks
This site is situated in a commercial area near a high traffic count intersection. A
large regional park is located to the northwest of the site.

80

2015 Ambient Air Monitoring Network Plan

Monitoring Information
Site Name
Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of hourly observations
Number / Dates of standard exceedances in
2015

Historical exceedances
Current Sampling frequency / Season
Probe height
Probe material / Residence time
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type

22ND STREET & ALVERNON
CARBON MONOXIDE
174
1
42101 / 1
NAAQS comparison / Highest Concentration
Highest Concentration
Ecotech / Serinus 30 and Thermo Scientific 48i – TLE
FRM
PDEQ / PDEQ
n/a
SLAMS
Microscale
8623
0
Years: 1975 - 1986 and 1988
Continuous
3.4 meters above the ground attached to a wall near 22nd Street at a
Tucson Water well site
FEP Teflon / 24.4 seconds
320 , from 5 to 325 includes predominant wind direction from 135
(SE; directly from intersection of 22nd St. and Alvernon Way).
1.1 meters
n/a
2.0 meters
10.7 meters
n/a
n/a

Nearest roads distance & direction to
monitor / ADT

60 meters west of Alvernon Way with a 2014 ADT of 29,475

Site meets 40 CFR 58, Appx. A,C,D,E
MSA

Yes

10 meters north of 22nd Street with a 2012 ADT of 43,000

Tucson, AZ 8520
Comments: The site was relocated in October, 2001 to a Tucson Water well site 50 meters west of the
original location. The move was necessitated by an intersection improvement project and anticipated
construction on the northwest corner. The shelter was moved again in January, 2004, to a different corner
within the well site, and the probe was attached to a wall in virtually the same location as before the
shelter was moved, so airflow from the intersection would remain unrestricted. 22nd & Alvernon
continues to measure the highest CO concentrations in the network. The prevailing morning- hour
southeasterly winds usually disperse CO generated in the intersection. During stagnant conditions,
especially during the winter inversion formation, CO generated in the intersection has a longer residence
time. Although population exposure is limited at this location, 22nd & Alvernon is representative of worstcase intersections in Tucson. This site has been operating continuously since 1975. No exceedances of the
eight-hour health standard were recorded in 1989 through 2015.

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2015 Ambient Air Monitoring Network Plan

CHERRY & GLENN: AQS # 040191021

Site Description
Site Name

CHERRY & GLENN

AQS ID
Address
Latitude / Longitude
Elevation
Surrounding landscape
Location description

040191021
2745 N. Cherry Avenue, Tucson, AZ
32.25658 / -110.948650
2400
Gravel in fenced compound, paved parking lot, streets
This site is located in a predominately residential neighborhood, approximately
0.8 km northwest of a high traffic count intersection. Directly south and west of
the site is a private High School enrolling approximately 1200 students.

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2015 Ambient Air Monitoring Network Plan

Monitoring Information
Site Name
Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of hourly observations
Number / Dates of standard exceedances
in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Probe material / Residence time
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

Site meets 40 CFR 58, Appx. A,C,D,E
MSA

CHERRY & GLENN
CARBON MONOXIDE
054
1
42101 /1
NAAQS comparison / Population Exposure
Population Exposure
Thermo Scientific / 48c
FRM
PDEQ/ PDEQ
n/a
Special Purpose
Neighborhood
4313
0
0
Continuous / Seasonal monitor operation from Jan 1- March
31 and Oct.1 – Dec. 31
4.9 meters above the ground on a shelter in a city water well
site.
FEP Teflon / 5.47 seconds
360
1.1meters
n/a
n/a
8.7 meters
n/a
n/a
0.8 kilometers north of Grant Road with a 2014 ADT of
34,034
0.5 kilometers west of Campbell Avenue with a 2014 ADT of
35,740
Yes

Tucson, AZ 8520

Comments: Cherry & Glenn was established as a special purpose site in February 1989, in order to assess
the CO levels at a distance (less than 1 kilometer) from a typical high-volume intersection. This site has
historically recorded very low levels of CO during the summer months. Consequently, in 2001, seasonal
monitoring began with sampling from October through March.

83

2015 Ambient Air Monitoring Network Plan

GOLF LINKS & KOLB: AQS # 040191031

Site Description
Site Name

GOLF LINKS & KOLB

AQS ID
Address
Latitude / Longitude
Elevation
Surrounding landscape
Location description

040191031
2601 South Kolb Road
32.191180 / -110.840550
2692
Dirt lot and easement, paved street
This site is located near the southeast corner of Golf Links and Kolb roads in a
City of Tucson water reservoir site. Light commercial enterprises occupy all four
corners and separate the intersection from residential neighborhoods.

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2015 Ambient Air Monitoring Network Plan

Monitoring Information
Site Name
Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of hourly observations
Number / Dates of standard exceedances
in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Probe material / Residence time
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT

GOLF LINKS & KOLB
CARBON MONOXIDE
054
1
42101 / 1
NAAQS comparison / Highest Concentration
Highest Concentration
Thermo Scientific/ 48C
FRM
PDEQ/ PDEQ
n/a
Special Purpose
Microscale
4338
0
0
Continuous / Seasonal Monitor operating Jan. 1- March 31
and Oct. 1 – Dec. 31
3.0 meters above the ground on a pole located next to Kolb
road
FEP Teflon / 28.96 seconds
360
n/a
n/a
n/a
2.7 meters
n/a
n/a
100 meters south of Golf Links, with a 2014 ADT of 37,210
2 meters east of Kolb Road, with a 2013 ADT of 40,462

Site meets 40 CFR 58, Appx. A,C,D,E
MSA

Yes

Tucson, AZ 8520

Comments: Golf Links & Kolb was established as a special purpose site in September 2002, as part of
the Carbon Monoxide Limited Maintenance Plan. Inlet placement qualifies it as a microscale site, and
sighting it on the southeastern quarter of the intersection provides an opposite wind direction compliment
to the 22/Alvernon site. This site is operated seasonally, from October through March.

85

2015 Ambient Air Monitoring Network Plan

SAGUARO PARK EAST: AQS # 040190021

Site Description
Site Name

SAGUARO PARK EAST

AQS ID
Address
Latitude / Longitude
Elevation
Surrounding landscape
Location description

040190021
3905 South Old Spanish Trail, Tucson, AZ
32.174538 / -110.737116
3089
Natural desert
This site is situated in the National Park. The nearby light residential area has no
significant local sources of ozone precursors.

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2015 Ambient Air Monitoring Network Plan

Monitoring Information
Site Name

SAGUARO PARK EAST

Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of daily observations
Number / Dates of 8-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height

OZONE

Probe material / Residence time
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT
Site meets 40 CFR 58, Appx. A,C,D,E
MSA

047
1
44201 /1
NAAQS comparison / Highest Concentration
Highest Concentration
Thermo Scientific / 49i
FEM
PDEQ/ PDEQ
n/a
SLAMS
Neighborhood
364
0
one in 1999, 2003, 2005, 2008; three in 2011; one in 2014
Continuous
4.1 meters above the ground in Saguaro National Park East on
the roof of a shelter that is one kilometer south of the
administration building.
FEP Teflon / 6.58 seconds
360
1.22 meters
n/a
n/a – (trailer was removed)
8.0 meters
n/a
n/a
80 meters east to Old Spanish Trail with a 2015 ADT of
6,535
105 meters south of Escalante with a 2014 ADT of 3,560
Yes

Tucson, AZ 8520

Comments: The Saguaro National Park site has been active since 1982. The operation of the site was
taken over by the National Park Service in 1987. The Park Service returned operation of the site to Pima
County in 1993. Geographically, Saguaro National Park is on the eastern edge of the Tucson metropolitan
area. Ozone data from this site has been used to study how the levels of ozone affect natural vegetation.

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2015 Ambient Air Monitoring Network Plan

FAIRGROUNDS: AQS # 040191020

Site Description
Site Name

FAIRGROUNDS

AQS ID
Address
Latitude / Longitude
Elevation
Surrounding landscape
Location description

040191020
11330 S. Houghton Road, Tucson, AZ
32.047680 / -110.774350
3078
Natural desert vegetation on lag gravel
This site is situated in an undisturbed natural desert area to the north and east. The
Pima County Fairgrounds and drag strip are located directly southwest of the site.

88

2015 Ambient Air Monitoring Network Plan

Monitoring Information
Site Name
Pollutant
Method code
Number of monitors
Parameter code / POC
Basic monitoring objective / Statement of
purpose
Site type
Instrument Manufacturer / Model
FRM/FEM/ARM/other
Collecting agency / Reporting agency
Analytical lab
Monitor type
Scale
Number of daily observations
Number / Dates of 8-hour standard
exceedances in 2015
Historical exceedances
Current Sampling frequency / Season
Probe height
Probe material / Residence time
Degrees of unrestricted air flow
Distance from supporting structure
Distance from obstruction on roof
Distance from obstruction not on roof
Distance from trees
Distance to furnace or incinerator flue
Distance between collocated monitors/
Schedule / Collocated monitor type
Nearest roads distance & direction to
monitor / ADT
Site meets 40 CFR 58, Appx. A,C,D,E
MSA

FAIRGROUNDS
OZONE
047
1
44201 / 1
NAAQS comparison / Background
Background
Thermo Scientific / 49i
FEM
PDEQ/ PDEQ
n/a
Special Purpose
Urban
352
0
One in 2008 and 2011
Continuous
3.6 meters above the ground on a shelter on Tucson’s far
southeast side
FEP Teflon / 8.64 seconds
360
1.22 meters
n/a
n/a
n/a
n/a
n/a
53 meters west of Houghton road with a 2015 ADT of 11,752
Yes

Tucson, AZ 8520

Comments: Fairgrounds was established in October 1989. Ozone concentrations at this site have been
the highest in the network on occasion. This may be due to the afternoon wind shift that takes place almost
daily in the Tucson basin. The wind may be transporting urban ozone precursors or stable ozone to the far
east end of the Tucson air planning area.

89

Attachment A

Attachment B