SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT

SOUTH COAST AIR QUALITY MANAGEMENT DISTRICT

ANNUAL AIR QUALITY MONITORING

NETWORK PLAN

July, 2013

Prepared by

Rene M. Bermudez

Principal Air Quality Instrument Specialist

Jason Low

Atmospheric Measurements Manager
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Table of Contents

Page

Introduction 1

Public Comments 1

Network Design 1

Special Programs 18

Recent or Proposed Modifications to Network 20

Minimum Monitoring Requirements

Data Submittal and Archiving Requirements

33

40

Appendix A: Network Depiction Maps

 Ozone Monitoring Locations A-1

 PM10 Monitoring Locations A-2

 Nitrogen Dioxide Monitoring Locations A-3

 Carbon Monoxide Monitoring Locations A-4

 Sulfur Dioxide Monitoring Locations A-5

 Source and Ambient Lead Monitoring Locations A-6

 PAMS Monitoring Locations A-7

 PM2.5 Monitoring Locations A-8

Appendix B: Detailed Site Information

Appendix C: PM2.5 Continuous Monitor Comparability Assessment 

 and Request for Waiver
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INTRODUCTION

An annual review of the Air Quality Monitoring Network is required by Federal Regulations as a 

means to identify and report needs for additions, relocations, or terminations of monitoring sites 

or instrumentation. This report describes the network of ambient air quality monitors in the 

jurisdiction of and operated by the South Coast Air Quality Management District (SCAQMD). It 

includes a review of actions taken during the 2012-2013 fiscal year and plans for action in the 

year ahead. This plan addresses the requirement for an annual network plan as listed in Title 40, 

Part 58, Section 10 of the Code of Federal Regulations (40 CFR § 58.10). Regulations require 

the report be submitted to the U.S. Environmental Protection Agency (EPA) by July 1 of each 

year after a 30 day public comment period.

The SCAQMD staff, along with the California Air Resources Board (CARB), conducted an 

extensive review of the air monitoring sites in the South Coast Air Basin (SCAB) in late 1980. 

During the review, State and Local Air Monitoring Stations (SLAMS) designations, site type, 

and spatial scales of representativeness were assigned to the criteria pollutants monitored at each 

site. Since that time, the EPA Region IX and CARB staff visited selected sites to confirm 

compliance with applicable siting criteria and related requirements. The most recent site visits 

occurred in 2010 to conduct a comprehensive Technical System Audit (TSA) of the ambient air

monitoring network. Each year, SCAQMD staff conducts an annual review of its air monitoring 

network and submits it to the EPA. The review process focuses on current and future network air 

monitoring strategies and network changes are made in consultation with the EPA and CARB. 

When re-location of monitoring sites are required, site reports are updated in the EPA’s Air 

Quality System (AQS) to document compliance with established siting criteria for the new 

locations.

Public Comments 

Pursuant to Federal regulations, a draft plan is made available for public inspection and comment

for a period of 30 days prior to submission of the final plan to EPA. Hard copies of the final

document are made available on July 1, 2013 at the SCAQMD’s Public Information Desk in 

Diamond Bar, CA. The document is also available on the SCAQMD as of May 15, 2013 in the 

drop down menu under the “Community”, “Air Quality” and “Air Monitoring Network Plan.” 

(http://www.aqmd.gov/tao/AQ-Reports/AQMonitoringNetworkPlan/AQnetworkplan.htm). The 

final document is submitted to the EPA on July 1, 2013 along with any public comments 

received to fulfill Federal regulatory requirements.

Network Design

The SCAQMD operates 35 permanent, multi-pollutant monitoring stations, and 5 singlepollutant source impact Lead (Pb) air monitoring sites in the SCAB and a portion of the Salton 

Sea Air Basin in Coachella Valley. This area includes Orange County and the non-desert 

portions of Los Angeles, Riverside, and San Bernardino Counties. The newest permanent site 

was added during June 2010 to monitor Ozone (O3) and continuous PM2.5 for the Temecula 

area. The newest source Pb sites were added in January 2010 as required by EPA regulation.

The Mira Loma High School (Jurupa) site was closed in May 2011 and is replaced by the Mira 

Loma (Van Buren) location. Table 1 provides a list of monitoring locations, the EPA AQS site 
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codes, and the pollutants measured at each site. Table 2 provides the spatial scale and the site 

type for each monitor at all sites.

Table 3 describes the monitoring purpose for the monitors at each site. Table 4 describes the site 

type, spatial scale and monitoring purpose for continuous particulate analyzers at each site. A 

new requirement of the annual network plan implemented in 2007, the monitoring purpose is the 

reason why a certain pollutant is being measured at a certain site. 

A list and description of monitoring purposes are provided below and portions are adapted from 

the CARB annual network plan for 2007. 

Background Level monitoring is used to determine general background levels of air 

pollutants as they enter the SCAB.

High Concentration monitoring is conducted at sites to determine the highest concentration 

of an air pollutant in an area within the monitoring network. A monitoring network may 

have multiple high concentration sites (i.e., due to varying meteorology year to year).

Pollutant Transport is the movement of pollutant between air basins or areas within an air 

basin. Transport monitoring is used to assess and mitigate upwind areas when transported 

pollutant affects neighboring downwind areas. Also, transport monitoring is used to 

determine the extent of regional pollutant transport among populated areas and to rural 

areas.

Population Exposure monitoring is conducted to represent the air pollutant concentrations

that a populated area is exposed to.

Representative Concentration monitoring is conducted to represent the air quality 

concentrations for a pollutant expected to be similar throughout a geographical area. These 

sites do not necessarily indicate the highest concentrations in the area for a particular 

pollutant.

Source Impact monitoring is used to determine the impact of significant sources or source 

categories of air quality emissions on ambient air quality. The air pollutant sources may be 

stationary or mobile.

Trend Analysis monitoring is useful for comparing and analyzing air pollution 

concentrations over time. Usually, trend analyses show the progress or lack of progress in 

improving air quality for an area over a period of many years.

Site Comparison monitoring is used to assess the effect on measured pollutant levels of 

moving a monitoring location a short distance (usually less than two miles). Some 

monitoring stations become no longer usable due to development, change of lease terms, or 

eviction. In these cases, attempts are made to conduct concurrent monitoring at the old and 

new site for a period of at least one year in order to compare pollutant concentrations.
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Real Time Reporting/Modeling is used to provide data to EPA’s AIRNOW system which 

reports conditions for air pollutants on a real time basis to the general public. Data is also 

used to provide accurate and timely air quality forecast guidance to residents of the SCAB.

Multiple purposes for measuring a pollutant at a particular site are possible. There is some 

overlap between site type and monitoring purposes as defined by EPA and given in Tables 2, 3,

and 4.
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TABLE 1. List of Monitoring Sites

Location AQS No. Pollutants Monitored Start 

Date

1 Anaheim 060590007 CO,NO2,O3,PM10,PM2.5 08/01

2 ATSF (Exide) 060371406 Pb 01/99

3 Azusa 060370002 CO,NO2,O3,PM10,PM2.5,SO4 01/57

4 Banning Airport 060650012 NO2,O3,PM10, PM2.5 04/97

5 Big Bear 060718001 PM2.5 02/99

6 Burbank 060371002 CO,NO2,SO2,O3,PM10,PM2.5 10/61

7 Closet World (Quemetco) 060371404 Pb 10/08

8 Compton 060371302 CO,NO2,O3,Pb,PM2.5 01/04

9 Costa Mesa 060591003 CO,NO2,SO2,O3 11/89

10 Crestline 060710005 O3,PM10 10/73

11 Fontana 060712002 CO,NO2,SO2,O3,PM10,PM2.5,SO4 08/81

12 Glendora 060370016 CO,NO2,O3,PM2.5,PM10 08/80

13 Indio 060652002 O3,PM10,PM2.5 01/83

14 La Habra 060595001 CO,NO2,O3 08/60

15 Lake Elsinore 060659001 CO,NO2,O3,PM2.5,PM10 06/87

16 LAX Hastings 060375005 CO,NO2,O3,PM10,Pb,SO4 04/04

17 Long Beach (North) 060374002 CO,NO2,SO2,O3,PM10,PM2.5,Pb,SO4 10/62

18 Los Angeles (Main St.) 060371103 CO,NO2,SO2,O3,PM10,Pb,PM2.5,SO4 09/79

19 Mira Loma (Van Buren) 060658005 CO,NO2,O3,PM10,PM2.5 11/05

20 Mission Viejo 060592022 CO,O3,PM10,PM2.5 06/99

21 Norco 060650003 PM10 12/80

22 Ontario Fire Station 060710025 PM10,PM2.5 01/99

23 Palm Springs 060655001 CO,NO2,O3,PM10,PM2.5 04/71

24 Pasadena 060372005 CO,NO2,O3,PM2.5,SO4 04/82

25 Perris 060656001 O3,PM10 05/73

26 Pico Rivera #2 060371602 CO,NO2,O3,Pb,PM2.5,SO4,PM10 09/05

27 Pomona 060371701 CO,NO2,O3 06/65

28 Redlands 060714003 O3,PM10 09/86

29 Rehrig (Exide) 060371405 Pb 11/07

30 Reseda 060371201 CO,NO2,O3,PM2.5 03/65

31 Riverside (Magnolia) 060651003 CO,NO2,Pb,PM10,PM2.5,SO4 10/72

32 Rubidoux 060658001 CO,NO2,SO2,O3,PM10,Pb,PM2.5,SO4 09/72

33 San Bernardino 060719004 CO,NO2,O3,PM10,Pb,PM2.5 05/86

34 Santa Clarita 060376012 CO,NO2,O3,PM10,PM2.5 05/01

35 South Long Beach 060374004 PM10,Pb,PM2.5,SO4 06/03

36 Temecula 060650016 O3, PM2.5 06/10

37 Uddelholm (Trojan 

Battery) 060371403 Pb 11/92

38 Upland 060711004 CO,NO2,O3,Pb,PM2.5,PM10,SO4 03/73

39 Van Nuys Airport 060371402 Pb 01/10

40 West Los Angeles 060370113 CO,NO2,O3,SO4 05/84

1

 
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TABLE 2. FRM/FEM Criteria Pollutant Spatial Scales and Site Type

SPATIAL SCALE SITE TYPE

MI – Microscale HC – Highest Concentration

MS – Middle Scale PE – Population Exposure

NS – Neighborhood Scale IM – Source Oriented (Impact)

US – Urban Scale BK – General Background

Location CO NO2 SO2 O3 Manual 

PM10

Manual 

PM2.5

Pb

Anaheim NS/PE US/PE NS/PE NS/PE NS/PE

ATSF (Exide) MI/IM

Azusa NS/PE US/PE US/HC NS/PE NS/PE

Banning Airport NS/PE NS/PE NS/PE

Big Bear NS/PE

Burbank NS/HC NS/PE NS/PE US/HC NS/PE NS/PE

Closet World (Quemetco) MI/IM

Compton MS/HC MS/PE NS/PE NS/PE NS/PE

Costa Mesa NS/PE NS/PE NS/PE NS/PE

Crestline NS/HC NS/PE

Fontana NS/PE US/PE NS/PE US/PE NS/HC NS/PE

Glendora NS/PE NS/PE NS/HC

Indio NS/PE NS/HC NS/PE

La Habra NS/PE US/PE NS/PE

Lake Elsinore NS/PE NS/PE NS/PE

LAX Hastings MS/PE/BK MS/PE/BK NS/PE/BK NS/PE/BK NS/PE/BK NS/PE/BK

Long Beach (North) MI/HC MS/PE NS/HC NS/PE MI/PE NS/HC MI/PE

Los Angeles (Main St.) NS/PE NS/HC NS/PE NS/PE NS/PE NS/HC NS/PE

Mira Loma (Van Buren) NS/PE NS/PE NS/PE NS/HC NS/HC

Mission Viejo NS/PE NS/PE NS/PE NS/PE

Norco NS/PE

Ontario Fire Station NS/HC NS/PE

Palm Springs NS/PE NS/PE NS/PE NS/PE NS/PE

Pasadena MS/PE MS/HC NS/PE NS/PE

Perris NS/PE NS/PE

Pico Rivera #2 NS/PE NS/HC NS/HC NS/PE NS/PE

Pomona MI/PE MS/PE NS/HC

Redlands NS/PE NS/PE

Rehrig (Exide) MI/IM

Reseda NS/PE US/PE US/HC NS/PE

Riverside MI/HC US/PE NS/HC MI/HC

Rubidoux NS/PE US/PE NS/PE US/HC NS/HC NS/HC NS/PE

San Bernardino MS/PE US/PE NS/HC NS/HC NS/PE NS/PE

Santa Clarita NS/PE NS/PE US/HC NS/PE NS/PE

South Long Beach NS/HC NS/HC NS/HC

Temecula NS/HC

Uddelholm (Trojan Battery) MI/IM

Upland NS/PE NS/PE NS/PE NS/PE

Van Nuys Airport MI/IM

West Los Angeles NS/PE MS/HC NS/PE
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TABLE 3. FRM/FEM Criteria Pollutant Monitoring Purposes

MONITORING PURPOSE

BK – Background RC – Representative Concentration

HC – High Concentration RM – Real-Time Reporting/Modeling

TP – Pollutant Transport TR – Trend Analysis

EX – Population Exposure CP – Site Comparisons

SO – Source Impact CO - Collocated

Location CO NO2 SO2 O3 Manual 

PM10 

Manual 

PM2.5 Pb

Anaheim TR TR/RC TR TR/RC TR/EX

ATSF (Exide) SO

Azusa TR TR/RC TR TR TR/EX

Banning Airport TP/RC TP TP

Big Bear EX/SO/TP

Closet World (Quemetco) SO

Burbank TR TR/RC TR TR TR/RC TR/EX

Compton TR/HC TR/RC TR/RC EX/RC EX

Costa Mesa RC TR/RC TR RC

Crestline HC TP/RC

Fontana RC TP/RC TR RC HC EX/TP

Glendora RC TR/RC HC

Indio TP HC/CO TP/EX

La Habra RC TR/RC RC

Lake Elsinore TP/RC TP/RC TP/RC

LAX Hastings BK BK BK BK BK BK

Long Beach (North) HC TR/RC TR/HC TR TR/RC EX/HC EX/CO

Los Angeles (Main St.) SO/RC SO/HC TR TR/RC TR/RC/CO EX/HC/CO EX/CO

Mira Loma (Van Buren) TR/RC TR/RC TR/HC HC EX/HC/CO

Mission Viejo RC TR/RC TR/RC EX/RC

Norco TR/RC

Ontario Fire Station HC/CO EX/RC

Palm Springs TP/RC TP/RC TP TP/HC EX/TP

Pasadena TR/RC TR/HC TR/RC EX/RC

Perris TP TR

Pico Rivera #2 RC HC HC EX/RC EX

Pomona RC RC HC

Redlands TP/RC TP/RC

Rehrig (Exide) SO/CO

Reseda RC TR/RC HC EX/RC

Riverside HC TR/RC EX/HC EX/CO

Rubidoux TR/RC TR/RC TR TR/HC TR/HC/CO EX/TR/HC/CO EX

San Bernardino TR/RC TP/RC TR/HC TR/HC EX/TR EX

Santa Clarita RC TP/RC TP/HC RC EX/RC

South Long Beach HC EX/SO EX

Uddelholm (Trojan Battery) SO

Temecula2 TR/HC

Upland RC TR/RC TR/RC EX

Van Nuys Airport SO

West Los Angeles RC TR/HC RC
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TABLE 4. Continuous PM10/PM2.5 Monitoring Purpose, Site Type and Spatial Scales

SITE TYPE SPATIAL SCALE INSTRUMENT TYPE

HC – High Concentration MI – Microscale TEOM 

PE – Population Exposure NS – Neighborhood Scale BAM (NON-FEM)

BK - Background BAM (FEM)

MONITORING PURPOSE

SO – Source Impact RM – Real-Time Reporting/Modeling

TP – Pollutant Transport SPM – Special Purpose Monitoring

TR – Trend Analysis CO - Collocated

Location Continuous PM10 Continuous PM2.5

Type Purpose Site Type Scale Type Purpose Site Type Scale

Anaheim BAM/FEM RM/TR PE NS BAM/FEM RM/TR PE NS

Banning Airport BAM/NON-FEM RM PE NS

Burbank TEOM/FEM RM/TR PE NS BAM/FEM RM/TR PE NS

Crestline BAM/NON-FEM RM PE NS

Glendora BAM/FEM RM PE NS BAM/NON-FEM RM PE NS

Indio TEOM/FEM RM HC NS

Lake Elsinore TEOM/FEM RM PE NS BAM/NON-FEM RM PE NS

Long Beach (North) BAM/FEM RM/TR PE NS BAM/FEM RM HC NS

Los Angeles (Main St.) BAM/FEM RM/TR PE NS BAM/FEM RM HC NS

Mira Loma (Van Buren) BAM/FEM RM HC NS BAM/FEM RM HC NS

Palm Springs TEOM/FEM RM/TP HC NS

Reseda BAM/NON-FEM RM PE NS

Riverside BAM/FEM RM HC NS BAM/NON-FEM RM HC NS

Rubidoux TEOM/FEM RM/TR HC NS BAM/FEM & 

NON-FEM RM/TR/CO HC NS

San Bernardino TEOM/FEM RM/TR HC NS

Santa Clarita BAM/NON-FEM RM PE NS

South Long Beach BAM/FEM RM/SO PE NS

Temecula BAM/NON-FEM RM PE NS

Upland BAM/FEM RM PE NS BAM/NON-FEM RM PE NS
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A brief description of the criteria pollutant and program monitoring networks are provided 

below:

OZONE (O3)

The SCAQMD operates 29 sites where O3 measurements are made as part of the Air 

Monitoring Network. O3 sites are spread throughout the SCAB with highest 

concentrations measured inland. Figure 1 in Appendix A shows the spatial distribution of 

these sites and Table 16 shows the minimum monitoring requirements.

PM10

Size-selective inlet manual high volume samplers are operated at 21 sites to meet the 

requirements for PM10 Federal Reference Method (FRM) sampling. The Indio, Ontario, 

and Rubidoux sites are designated as collocated sites as shown in the particulate 

collocation requirements, Table 24. All PM10 FRM monitors operate on a one day in six 

day schedule, with the exception of Indio and Rubidoux which operate on one day in three 

day schedule.

PM10 continuous analyzers are operated at 13 sampling sites. These real-time devices are 

capable of making hourly particulate concentration measurements. Table 4 describes the 

monitor type, site type, monitoring purpose, and spatial scale for continuous particulate 

analyzers. Figure 2 in Appendix A shows the spatial distribution of the sampling sites and 

Table 18 shows the minimum monitoring requirements. Real-time monitors, for the most 

part, are clustered in the high concentration areas, with two located in the desert area where 

wind-blown crustal material has caused exceedances of the twenty-four hour standard

during exceptional events. In downwind areas of the SCAB, a large fraction of particulate 

is formed in the atmosphere; PM10 reaches maximum levels during late summer through 

early winter months. 

Where both 24 hour PM10 FRM samplers and PM10 FEM continuous analyzers are 

deployed together, they are sited as collocated for data comparison purposes. The 24 hour 

FRM PM10 sampler remains the primary analyzer used for attainment purposes.

NITROGEN DIOXIDE (NO2)

The area wide NO2 network consists of 25 sites. These sites are mostly located in areas of 

highest NO2 concentration. The spatial distribution of NO2 monitors is shown in Figure 3

in Appendix A and minimum monitoring requirements are shown in Table 19. 

Additionally, the Regional Administrator identified 40 NO2 sites nationwide with a 

primary focus on siting these monitors in locations to protect susceptible and vulnerable 

populations. The Regional Administrator in collaboration with SCAQMD indentified the 

Los Angeles (Main), Long Beach (North) and San Bernardino sites from the existing areawide monitoring network to meet this requirement (58.10[a][5]). Review of 1992 through 

2012 NO2 data shows the State and Federal standards for NO2 were not exceeded.

On February 9, 2010 EPA promulgated new minimum monitoring requirements for NO2 

which require state and local agencies to install near road monitoring sites. On March 7, 

2013 EPA revised the Ambient Nitrogen Dioxide Requirements postponing near road 
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monitoring site implementation until January 1, 2014. The plan for the implementation of 

the near road network is detailed in the section titled, “Recent or Proposed Modifications 

to Network.”

CARBON MONOXIDE (CO)

Area wide CO monitors measure concentrations at 22 locations and microscale 

measurements are taken at 3 locations within the SCAQMD ambient air monitoring 

network. Figure 4 in Appendix A shows the spatial distribution of these sites. CO

emissions, primarily from motor vehicles, show a pattern consistent with major freeway 

arteries. A review of data for 2012 shows State and Federal standards for CO were not 

exceeded.

On August 31, 2011 EPA issued the Final Rule for the Review of National Ambient Air 

Quality Standards for CO. EPA revised the minimum requirements for CO monitoring by 

requiring CO monitors to be sited near roads in certain urban areas. EPA is requiring one CO

monitor to be collocated with a subset of near road NO2 monitors. Specifically, EPA is 

requiring the collocation of one CO monitor with a near road NO2 monitor in urban areas 

having populations of 1 million or more. EPA is specifying that monitors required in Core 

Based Statistical Areas (CBSA) of 2.5 million or more persons be operational by January 1, 

2015. 

One near road CO monitoring site is required in each of the Los Angeles-Long Beach-Santa 

Ana MSA\CBSA (Code 31100) and the Riverside-San Bernardino-Ontario MSA\CBSA 

(Code 40140) areas. Near road CO monitoring is to be implemented concurrently with the 

near road NO2 monitoring network and operational by January 1, 2015. Minimum 

monitoring requirements are shown in Table 21.

SULFUR DIOXIDE (SO2)

SO2 monitors are located at 7 sites. Figure 5 in Appendix A shows the spatial distribution 

of the sites. Most SO2 emissions come from Federal transportation sources such as marine 

vessels. The monitors are clustered mostly in the areas where these sources are located. 

On June 22, 2010 EPA strengthened the SO2 National Ambient Air Quality Standard 

(NAAQS). Network design requirements included new minimum requirements be 

determined by the Population Weighted Emissions Index (PWEI).

The PWEI shall be calculated by States for each CBSA they contain or share with 

another State or States for use in the implementation of or adjustment to the SO2

monitoring network. The PWEI shall be calculated by multiplying the population 

of each CBSA, using the most current census data or estimates, and the total 

amount of SO2 in tons per year emitted within the CBSA area, using an aggregate 

of the most recent county level emissions data available in the National Emissions 

Inventory (NEI) for each county in each CBSA. The resulting product shall be 

divided by one million, providing a PWEI value, the units of which are million 

persons-tons per year. For any CBSA with a calculated PWEI value equal to or 

greater than 1,000,000, a minimum of three SO2 monitors are required within that 
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CBSA Population Estimate NEI SO2 Emmissions PWEI Value Minimum Required SO2 

31100 13,052,921 12,062.81 157,455 2

40140 4,350,096 2,550.94 11,097 1

CBSA. For any CBSA with a calculated PWEI value equal to or greater than 

100,000, but less than 1,000,000, a minimum of two SO2 monitors are required 

within that CBSA and for any CBSA with a calculated PWEI value equal to or 

greater than 5,000, but less than 100,000, a minimum of one SO2 monitor is 

required within that CBSA.

TABLE 5. PWEI Calculation and Minimum Required SO2

SCAQMD exceeds the minimum requirement for SO2 monitors; the Federal standard has 

not been exceeded for nearly 33 years.

PARTICULATE LEAD

Total Suspected Particulate (TSP) Pb measurements are collected at 15 sites as part of the 

network; 5 of the sites are Source Impact for Pb, and the remaining 10 sites measure 

ambient Pb, and Sulfates (SO4). There are 2 additional sites which measure SO4 only 

which are under consideration for removal since ARB deleted the TSP SO4 method, ARB 

method MLD 033, and replaced it with the existing ARB method and creating a new 

standard for PM10 SO4, ARB method MLD 007.

The Rehrig (Exide) site measures the highest Pb concentrations in the monitoring network. 

Upon review of data (2010-2012) Rehrig (Exide) Pb monitoring site measured 0.46 ug/m3 

as a 3 month rolling average. The Rehrig (Exide) monitoring location has been designated 

as a collocated monitoring location along with the Long Beach, Los Angeles, and 

Riverside sites as shown in the minimum monitoring requirements, Table 24. The spatial 

distribution of these sites is shown in Figure 6 in Appendix A.

In 1990, the EPA requested that the SCAQMD collect ambient air particulate samples near 

several large Pb handling (battery recycling) facilities. Long-term source impacted 

monitoring began in 1991. A facility in the City of Industry exceeded the Federal ambient 

particulate Pb standard during the second quarter of Fiscal Year 1991-92. Pb monitoring at 

a facility in the City of Torrance ended in 1993 when measurements were consistently 

below the ambient standard. Sampling ended at a facility in the City of Commerce in 2006 

when the business was closed. Out of the two facilities currently being monitored, the 

facility in the City of Vernon exceeded the old Federal ambient particulate Pb standard (1.5 

ug/m3 quarterly) during the first quarter of 2008; the other facility was found to remain 

below this level. These source-related Pb sites are also depicted in Figure 6.

On November 12, 2008, the EPA issued final revisions to the NAAQS for Pb. Network 

design requirements included monitoring for sources of Pb (source oriented monitoring) 

and urban Pb monitoring (non-source oriented). To meet this requirement, a source 

oriented site was established on January 1, 2010 at the Van Nuys Airport and monitoring 

will continue at the sites surrounding the Exide (Vernon), Quemetco (Industry), and the
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Trojan Battery facilities. Existing urban Pb monitoring conducted at Compton, LAX 

Hastings, Long Beach (North), Los Angeles (Main), Pico Rivera, Riverside Magnolia, 

Rubidoux, San Bernardino, South Long Beach, and Upland exceed the minimum 

monitoring requirements. 

The final rule for Pb went into effect on January 26, 2011. In the final rule the Van Nuys 

Airport was no longer included on the list of airports where lead monitoring was required, 

and a more recent emissions inventory showed lead emissions less than 1 ton per year. 

The data from the Van Nuys Airport Pb site is currently under review to determine the 

need for continued monitoring based upon conditions as cited in 40 CFR 58 Appendix D 

4.5.

The most recent NEI data available shows the Long Beach Airport, Daugherty Field (NEI 

2008, Version 2 http://www.epa.gov/ttn/chief/net/2008inventory.html) just over the 

requirement for Pb source monitoring at 1.02528004 tpy. As part of the MATES IV 

program, SCAQMD is conducting a preliminary study to determine the need for long term 

Pb source monitoring at the Long Beach Airport. The study is expected to be completed 

and assessment conducted by the end of 2014. A determination will be made in 

consultation with EPA Region IX on the need for long term monitoring at the time of the 5 

year network assessment in 2015.

Photochemical Assessment Monitoring Stations

The Photochemical Assessment Monitoring Stations (PAMS) network was initiated in 

June 1994 at Pico Rivera and Upland. During 1995 sites were established at Banning and 

Azusa to determine speciated hydrocarbon O3 precursor compounds in ambient air. 

PAMS monitoring at Hawthorne commenced in June 1997 and the Burbank station 

became a PAMS site in July 1997. In May 2001, the Santa Clarita location was 

established as a PAMS site. In April 2004, the Hawthorne site was replaced by LAX 

Hastings, due to the end of a property lease. In August 2005, the Pico Rivera station 

moved to a new location one half mile south of the previous site, also due to the end of the 

property lease.

On October 17, 2006, the EPA issued final amendments to PAMS monitoring 

requirements in 40 CFR § 58. The changes made to the rule were to implement 

recommendations made by the PAMS workgroup formed to assess the program. The 

workgroup recommended changes be made to site type and monitoring objectives. During 

September 2008, a report from the EPA PAMS network assessment project workgroup was 

issued. The objectives of the workgroup were to assess how well the current PAMS 

network was meeting monitoring objectives, determine which sites are most useful for 

meeting objectives, identify potentially redundant, ineffective, or unnecessary sites, and to 

assess other enhanced O3 monitoring activities that may prove useful.

To address regulatory changes, site-specific observations from the PAMS network 

assessment project, and potential synergies between programs, SCAQMD made the 

following changes in June 2009 to the PAMS monitoring network:
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 Burbank was reclassified from Type 2/1 to Type 2. This change addressed the 

National PAMS Network Assessment observation that Burbank should be reclassified 

to a Type 2 precursor site. The recommendation is consistent with the heavily 

urbanized/industrialized area, which is impacted by high levels of O3 precursor 

emissions. 

 Santa Clarita was reclassified as Type 3 from Type 2. Although the National PAMS 

Network Assessment observed that Santa Clarita was consistent with a Type 2 site, 

recent data was more consistent with a Type 3 maximum O3 concentration site rather 

than a Type 2 O3 precursor site.

 Banning was relocated to Los Angeles (Main). The National PAMS Network 

Assessment observed that Banning had the lowest O3 concentrations of all the Type 2 

sites and should be reclassified to a Type 3 or 4 site. Instead, to create synergies 

between programs, SCAQMD relocated the Banning PAMS site to the Los Angeles 

(Main) site as Type 2. This satisfies the EPA recommendation for use of the same 

monitoring platform and equipment to meet the objectives of multiple programs. Los 

Angeles (Main) is also a National Air Toxics Trends Station (NATTS), a 

National Core-Multi-pollutant Monitoring Station (NCore), and a Speciation Trends 

Network (STN) site.

 Azusa was reclassified from Type 3 to Type 2. This proposed change addresses the 

National PAMS Network Assessment observation that Azusa has high Volatile 

Organic Compounds (VOC) and Oxides of Nitrogen (NOX) concentrations, with 

lower O3 concentrations. The site now more closely resembles a Type 2 O3 

precursor site.

 Upland was relocated to the Rubidoux site. The National PAMS Network 

Assessment observed that Upland was no longer consistent with a Type 4 site and 

recommended reclassification to Type 3. SCAQMD relocated the Upland PAMS site 

to Rubidoux as a Type 3 location where synergies can be created among the NATTS, 

NCore, and the STN programs.

 LAX Hastings and Pico Rivera remained unchanged.

Currently, manual VOC canisters are in operation at the Azusa, LAX Hastings, Rubidoux, 

Los Angeles (Main), and Santa Clarita air monitoring stations. During the intensive season 

from July 1 until September 30, VOC canisters are run every three hours for a period of 

twenty-four hours every 3rd day and a twenty-four hour sample is run every 6th day. 

During the non-intensive season from October 1 through June 30, twenty-four hour VOC 

canister samples are run every 6th day.

At Los Angeles (Main) and Santa Clarita air monitoring stations, during the intensive 

season from July 1 until September 30, carbonyl samples are run every three hours for a 

period of twenty-four hours every 3rd day and a twenty-four hour sample is run every 6th 

day. During the non-intensive season from October 1 through June 30, twenty-four hour 

carbonyl samples are run every 6th day.

Automated Gas Chromatography Flame Ionization Detector (GC\FID) VOC systems are in 

operation at the Pico Rivera and Burbank air monitoring stations. During the intensive 

sampling season from July 1 until September 30, the GC\FID is run to collect daily 3-hour 
Air Quality Monitoring Network Plan – July 2013

13

samples and twenty-four hour VOC canisters are run every 6th day. Like the other PAMS 

sites, carbonyl samples are run every three hours with one additional twenty-four hour 

sample run every 6th day. During the non-intensive season from October 1 through June 

30, the GC/FID is idle and twenty-four hour VOC canister samples are run every 6th day 

and twenty-four hour carbonyl samples are run every 6th day. Rubidoux is a collocated 

site for VOC canister sampling and Pico Rivera is a collocated site for VOC canister and 

carbonyl sampling. 

During April 2010, a system audit was conducted by the EPA, which assessed the 

SCAQMD NATTS/PAMS programs. The audit found no major issues with the operation 

of the network but recommended implementation of blanking and low level concentration 

challenge samples for the NATTS and PAMS programs. Blanking was implemented in 

June, 2010 and low level challenge samples were implemented during October, 2010 and 

are completed annually.

The first SCAQMD upper air meteorological monitoring station was established at Los 

Angeles International Airport (LAX) in 1994. Subsequent upper air stations include 

Ontario International Airport (ONT) installed in 1996, Moreno Valley (MOV) installed in 

2001 at the Moreno Valley Municipal Water Treatment Plant in Riverside County, Irvine 

installed at the University of California Research and Extension Center in 2006, and 

Pacoima at Whiteman Airport during May 2007. The upper air stations use a combination 

of remote sensing and surface meteorological instrumentation, including the Scintec

(formerly Radian/URS and Vaisala) LAP-3000 radar wind profiler with a Radio Acoustic 

Sounding System (RASS), the Atmospheric Systems Corporation (formerly 

AeroVironment Inc.) mini Sodar acoustic wind profiler, and tower-mounted 

meteorological measurements of wind, pressure, temperature, relative humidity, solar 

radiation, and ultraviolet radiation. Due to the age of the LAX upper air instrumentation 

and costly component failures, SCAQMD is proposing to replace the LAX instrumentation 

with the Whiteman Airport systems, thereby closing the Whiteman upper air station.

The PAMS network monitoring objectives and requirements are summarized in Table 6, 

Table 23 and Figure 7 in Appendix A shows the distribution of the PAMS network.
Air Quality Monitoring Network Plan – July 2013

14

TABLE 6. PAMS Network

July 1 to September 30 October 1 to June 30

Site 

Type

Date 

Established as 

PAMS

Site / AQS ID# VOC Carbonyl VOC Carbonyl Additional 

Requirements

1 04/01/2004

LAX Hastings 

(replaced 

Hawthorne)

8 x 3 hr samples every 3rd

day and 1 x 24 hr sample 

every 6th day

No Sampling 1 x 24 hr sample 

every 6th day No Sampling

2 06/01/1995 Azusa

8 x 3 hr samples every 3rd

day and 1 x 24 hour 

sample every 6th day

No Sampling 1 x 24 hr sample 

every 6th day No Sampling No/NOx required

2 07/01/1997 Burbank

Continuous GC and 1 x 

24 hr sample every 6th

day

8 x 3 hr samples every 

day and 1 x 24 hr 

sample every 6th day

1 x 24 hr sample 

every 6th day

1 x 24 hr sample 

every 6th day

2 06/01/2009 Los Angeles (Main)

8 x 3 hr samples every 3rd

day and 1 x 24 hour 

sample every 6th day

8 x 3 hr samples every 

3

rd day and 1 x 24 hr 

sample every 6th day

1 x 24 hr sample 

every 6th day

1 x 24 hr sample 

every 6th day

Trace level CO required 

at one type 2 site.

2 08/01/2005 Pico Rivera #2

Continuous GC and 1 x 

24 hr sample every 6th

day

8 x 3 hr samples every 

day and 1 x 24 hr 

sample every 6th day

1 x 24 hr sample 

every 6th day

1 x 24 hr sample 

every 6th day

3 06/09/2009 Rubidoux

8 x 3 hr samples every 3rd

day and 1 x 24 hour 

sample every 6th day

No Sampling 1 x 24 hr sample 

every 6th day No Sampling NOy required

3 05/01/2001 Santa Clarita

8 x 3 hr samples every 3rd

day and 1 x 24 hour 

sample every 6th day

8 x 3 hr samples 3rd day 

and 1 x 24 hr sample 

every 6th day

1 x 24 hr sample 

every 6th day

1 x 24 hr sample 

every 6th day

MONITORING OBJECTIVES: MONITORING REQUIREMENTS: REDUCED REQUIREMENTS:

1 – Upwind and background characterization site One type 1 or type 3 site required per area Speciated VOC only required at type 2 and one other 

(type 1 or 3)

2 – Maximum O3 precursor emissions impact site One type 2 site required per area Carbonyl only required in areas classified as serious 

or above 8 hr zone

3 – Maximum O3 concentration site No type 4 required NO/NOx required only at type 2

4 – Extreme downwind monitoring site NOy required at one site per PAMS area (type 1 or 3)
Air Quality Monitoring Network Plan – July 2013

15

PM2.5

A network of 17 FRM samplers was first implemented in January 1999. On December 26, 

1999, a second Coachella Valley PM2.5 sampling site was established in Palm Springs. 

On June 20, 2003, PM2.5 sampling began at the South Long Beach site. The final addition 

to the PM2.5 FRM network occurred in October 2005, at the new Mira Loma site. This 

brings the total number of PM2.5 FRM sampling sites to 20. The sites are depicted in 

Figure 8, Appendix A and the starting date of each sampler is listed in Table 7. In March

2012, a change was made relocating the collocated PM2.5 monitor from Indio to the Mira 

Loma (Van Buren) site. This change was made following approval from EPA. Collocated 

sampling sites include Rubidoux, Central Los Angeles, and Mira Loma (Van Buren). 

Manual PM2.5 monitors are neighborhood scale and population exposure representing 

community wide air quality and multiple sites are listed as population exposure. Because 

all of SCAQMD is in non-attainment for PM2.5, most of the sites are in areas of poor air 

quality therefore multiple sites are listed as population exposure and high concentration. If 

a PM2.5 network modification were to be implemented for a site that was in exceedence of 

the of the PM2.5 NAAQS levels, SCAQMD would notify US EPA Region IX via written 

communication. Public notice occurs as part of the annual network plan process with is 

stated in the annual network plan. All sites in the Network using FRM samplers are 

suitable for comparison against the annual PM2.5 NAAQS. 

During April 2009, SCAQMD completed minor changes to the FRM monitoring schedule 

to enhance Federal Equivalent Method (FEM) Beta Attenuation Monitor (BAM)

comparisons. On April, 16th, 2009 the Burbank and Mira Loma (Van Buren) FRM 

samplers changed to daily sampling from the 1-in-3 day schedule and the Azusa location 

changed from every day sampling to 1-in-3 day sampling. Federal minimum monitoring 

requirements for PM2.5 are still being met and/or exceeded.

 

Continuous PM2.5 Met One BAMs were first deployed in fiscal year 2001–02. Seventeen

monitors are now operating in the SCAB, two at Rubidoux (FEM & Non FEM BAM), and 

one each at Anaheim, Los Angeles, South Long Beach, Burbank, Mira Loma (Van Buren), 

and Banning sites. In January 2006, two additional samplers were added at Lake Elsinore 

and Glendora as part of the Children’s Health Study. As proposed in the 2008 network 

plan, FEM BAM monitors were deployed during October 2008, at the Anaheim, Burbank, 

Long Beach (North), Los Angeles (Main), Mira Loma (Van Buren), Rubidoux, and South 

Long Beach sites. Relocated NON-FEM BAM samplers were installed at Reseda, 

Riverside Magnolia, Santa Clarita, Crestline, and Upland. A NON-FEM BAM was

collocated with a FEM BAM at Rubidoux. An additional NON-FEM BAM sampler was 

deployed at Temecula during July, 2010. In 2011, all FEM BAMs have been reclassified 

from special purpose monitors to SLAMS under 40 CFR § 58.20. In 2013, SCAQMD 

conducted a PM2.5 Continuous Monitor Comparability Assessment (Appendix C) in 

accordance with the PM NAAQS rule published on January 15th, 2013 (78 FR 3086). 

Specific to the provisions detailed in §58.10 (b)(13) and §58.11 (e), the assessment results 

indicate that all of the SCAQMD PM2.5 Continuous Monitors do not meet the criteria to 

be compared against the NAAQS currently. Thus, SCAQMD is requesting a waiver to 

exclude PM2.5 continuous monitor data from NAAQS comparison (Appendix C). At such 
Air Quality Monitoring Network Plan – July 2013

16

time when the assessment indicates that the FEM monitors are with the acceptance criteria, 

then U.S. EPA will be notified of the results and the AQS parameters will be changed to 

indicate that the data will be eligible for comparison to the NAAQS upon U.S. EPA 

approval. 

Where both 24 hour FRM PM2.5 samplers and FEM PM2.5 continuous analyzers are 

deployed together, they are sited as collocated for data comparison purposes if the FEM 

analyzer meets the acceptance criteria under 78 FR 3086. The 24 hour 

TABLE 7. Manual PM2.5 FRM Monitoring Stations Assigned Site Numbers

Location Site Code ARB No. AQS No. Start Date Schedule

Anaheim ANAH 30178 060590007 01/03/99 Daily

Azusa AZUS 70060 060370002 01/04/99 1-in-3

Big Bear BGBR 36001 060718001 02/08/99 1-in-6

Burbank BURK 70069 060371002 01/21/99 Daily

Compton COMP 70112 060371302 11/08 1-in-3

Fontana FONT 36197 060712002 01/03/99 1-in-3

Indio “A” INDI 33157 060652002 01/30/99 1-in-3

Long Beach (North) LGBH 70072 060374002 01/03/99 Daily

Los Angeles “A” (Main St.) CELA 70087 060371103 01/03/99 Daily

Los Angeles “B” (Main St.) CELA 70087 060371103 01/06/99 1-in-6

Mira Loma (Van Buren) MRLM 33165 060658005 11/09/05 Daily

Mira Loma (Van Buren) “B” MRLM 33165 060658005 03/08/12 1-in-6

Mission Viejo MSVJ 30002 060592022 06/15/99 1-in-3

Ontario Fire Station ONFS 36025 060710025 01/03/99 1-in-3

Palm Springs PLSP 33137 060655001 12/26/99 1-in-3

Pasadena PASA 70088 060372005 03/04/99 1-in-3

Pico Rivera #2 PICO 70185 060371602 09/12/05 1-in-3

Reseda RESE 70074 060371201 01/24/99 1-in-3

Riverside RIVM 33146 060651003 01/06/99 1-in-3

Rubidoux “A” RIVR 33144 060658001 01/03/99 Daily

Rubidoux “B” RIVR 33144 060658001 01/03/99 1-in-6

San Bernardino SNBO 36203 060719004 01/03/99 1-in-3

South Long Beach SLGB 70110 060374004 06/20/03 Daily

FRM PM2.5 sampler remains the primary analyzer used for attainment purposes and 

continuous analyzers are designated as audit samplers unless the primary 24 hour FRM 

PM2.5 is offline then continuous FEM analyzer data can be substituted if the FEM 

analyzer meets the acceptance criteria under 78 FR 3086. 

PM2.5 speciation sampling is also a part of the SCAQMD PM2.5 program. Collocated 

STN and one SCAQMD Met One SASS PM2.5 samplers were deployed in March 2001 at 

Rubidoux. An additional STN and collocated SCAQMD SASS samplers were deployed at 

Central Los Angeles in 2002. In 2003, SCAQMD SASS PM2.5 speciation samplers were 
Air Quality Monitoring Network Plan – July 2013

17

installed at Fontana and Anaheim air monitoring sites. Analysis of the filters from the 

ambient network SASS samplers are being conducted at SCAQMD’s laboratory. The STN 

filters are shipped to Research Triangle Institute (RTI) for analysis. This approach has the 

concurrence of CARB and EPA, Region IX.

On December 14, 2012 EPA revised NAAQS for PM2.5. As part of the revision EPA 

updated monitoring requirements for PM2.5 including the addition of monitoring near 

heavily traveled roads in large urban areas. Specifically, EPA is requiring the collocation 

of one PM2.5 monitor with a near road NO2 or CO monitor in urban areas having 

populations of 1 million or more. EPA is specifying that monitors required in CBSAs of 

2.5 million or more persons are to be operational by January 1, 2015. One near road

PM2.5 monitoring site is required in each of the Los Angeles-Long Beach-Santa Ana 

MSA\CBSA (Code 31100) and the Riverside-San Bernardino-Ontario MSA\CBSA (Code 

40140) areas. Near road PM2.5 monitoring is to be implemented concurrently with the 

near road NO2 monitoring network and operational by January 1, 2015. 

National Air Toxics Trends Station (NATTS)

The NATTS program was developed to fulfill the need for long-term Hazardous Air 

Pollutant (HAP) monitoring data of consistent quality nationwide. SCAQMD has 

conducted several air toxics measurement campaigns in the past, which demonstrated the 

variety and spatial distribution of air toxics sources across SCAB. A single air toxics 

measurement site cannot reflect the levels and trends of air toxics throughout the SCAB. 

For this reason, two NATTS sites are used to characterize the SCAB’s air toxics levels. 

The first site is a central urban core site in Los Angeles that reflects concentrations and 

trends due primarily to urban mobile source emissions. A second, more rural, inland site at 

Rubidoux captures the transport of pollutants from a variety of upwind mobile and 

industrial sources in the most populated areas of the air basin. NATTS monitoring began 

in February 2007 and continues at the Los Angeles (Main) and Rubidoux air monitoring 

sites. During April 2010, a system audit was conducted by the EPA, which assessed the 

SCAQMD NATTS program. The audit found no major issues with the operation of the 

network but recommended implementation of blanking and low level concentration 

challenge samples for the NATTS and PAMS programs. Blanking was implemented in 

June, 2010 and low level challenge samples were implemented during October, 2010 and 

completed annually.

NCore

NCore monitoring rules require that SCAQMD make NCore sites operational by January 

1

st, 2011. To meet this goal, SCAQMD installed trace level analyzers for CO, NOY and 

SO2 at the Rubidoux and Central Los Angeles sites. Continuous PM10 and PM2.5 BAM 

are utilized for PM10-PM2.5 measurements at both sites. Final calibrations were 

completed at the Rubidoux site January, 2011 and at the Central Los Angeles during May, 

2011. Both the Los Angeles and Rubidoux sites are NATTS and PAMS monitoring 

locations.
Air Quality Monitoring Network Plan – July 2013

18

Special Programs

Special monitoring programs are conducted for rule compliance purposes, to characterize the 

levels of toxic air contaminants and other criteria pollutants in sub-regional areas or communities 

in the SCAB, or to support modeling and planning efforts. The following is a list of special 

monitoring programs that were active during the past year. Note that this is being provided for 

informational purposes only. 

MATES IV

The SCAB, a highly urbanized area, is home to about seventeen million people who own 

and operate about eleven million motor vehicles and contains some of the highest 

concentrations of industrial and commercial operations in the country. It also has the 

poorest air quality in the U.S. In 1986, SCAQMD conducted the first MATES study to 

determine the SCAB-wide risks associated with major airborne carcinogens. At the time 

the state of technology was such that only ten known air toxic compounds could be 

analyzed. In 1998, a second MATES study (MATES II) represented one of the most 

comprehensive air toxics measurement programs conducted in an urban environment. 

MATES II included a monitoring program of 40 known air toxic compounds, an updated 

emissions inventory of toxic air contaminants, and a modeling effort to characterize health 

risks from hazardous air pollutants. In April 2004, the SCAQMD initiated the third round 

of MATES (MATES III) to assess the ambient levels of airborne compounds linked to 

adverse health effects in humans. In June, 2012 SCAQMD began MATES IV.

The objective of MATES IV is to characterize the ambient air toxic concentrations and 

potential exposures in the SCAB. This project includes one year of ambient monitoring for 

air toxics which will have a combination of SCAB-wide measurements and localized 

studies. The project will develop an updated toxics emissions inventory and conduct air 

dispersion modeling to estimate ambient levels and the potential health risks of air toxics. 

The results of this effort will determine the spatial concentration pattern of important 

hazardous air pollutants in the SCAB, will assess the effectiveness of current air toxic 

control measures, provide trend data of air toxic levels, and be used to update and develop 

appropriate control strategies for reducing exposures to toxics associated with significant 

public health risks.

MATES IV proposes to enhance the spatial resolution of previous studies by 

characterizing the ambient concentration of selected toxic air compounds in communities 

with varying land-type usage, such as residential, industrial, and commercial, as well as 

gradients from source areas downwind to receptor areas. 

MATES IV monitoring sites will utilize MATES III sites for trend analysis. There are ten

fixed sites operating on a one-in-six day schedule for twenty-four hours. Monitoring 

locations include the Anaheim, Burbank, Compton, Fontana, Huntington Park, North Long 

Beach, LA Main Street, Pico Rivera, Rubidoux, and West Long Beach areas. MATES IV 

will add Ultra Fine Particulate (UFP) and Black Carbon (BC) continuous measurements. 

Mobile monitoring platforms are to be deployed for short term deployments at six to eight 

sites to include communities with varying land type usage. 
Air Quality Monitoring Network Plan – July 2013

19

Fugitive Dust Study

In support of SCAQMD Rule 403 - Fugitive Dust, SSI PM10 samplers are deployed on an 

episodic basis upwind and downwind of potential sources as required under Rule 403. 

Since 2003, periodic sampling has been conducted around gravel quarries and other 

industries which seem to be producing large volumes of dust. 

Hexavalent Chrome 

The SCAQMD has an ongoing program of collecting ambient hexavalent chromium in the 

vicinity of several chrome plating and cement production facilities located throughout the 

SCAB. Monitoring continues at Newport Beach, Riverside, and other locations throughout 

the SCAQMD jurisdiction.

College of the Desert

Because exceedances of the standard PM10 have been recorded at the Torres-Martinez 

(Indian Reservation) station, SCAQMD is conducting an independent monitoring study to 

evaluate the spatial representativeness of such measurements. A continuous PM10 monitor 

was set-up near “College of the Desert” on 12/07/10 where measurements continue to be 

taken. The College of the Desert monitor may be relocating to consolidate monitoring 

efforts in the Coachella Valley to Saul Martinez Elementary School.

GERDAU-TAMCO

GERDAU North America acquired the TAMCO Rancho Cucamonga steel mini mill in 

October, 2010. In 2012 Environ Corp. was retained to perform an environmental audit and 

found discrepancies in reported emissions. Environ found that SOx emissions were not 

accurately reported prior to 2011, NOx emissions were not accurately being measured and 

Pb emissions may contribute to an exceedence of the NAAQS. SCAQMD conducted 

inspections of the facility to address issues and continues monitoring for Pb and Cr+6 at 

the facility. If results of the monitoring effort show TAMCO as a source of Pb that could 

contribute to an exceedence of the NAAQS, it will be added to the source impact Pb 

monitoring network.

Salton Sea Monitoring

On Sunday September 9, 2012, a strong thunderstorm over the Salton Sea caused odors to 

be released and transported to the northwest, across the Coachella Valley and through the 

Banning Pass into the SCAB. The odors also crossed through the mountain passes west of 

the Salton Sea and into the Temecula Valley. The following day, SCAQMD received over 

235 complaints of sulfur and rotten egg type odors

As the Salton Sea recedes, potential for more of these large-scale odor events to occur in 

the future increases. SCAQMD is in the process of establishing an air monitoring network 

to monitor the type of expected nuisance pollutants which are released from the Salton Sea 

area. The primary objective of this monitoring network is to place monitoring resources at 

a lakeside location where peak hydrogen sulfide concentrations are expected to occur. The 

monitoring sites will provide data that can be used to assess population exposures in case 

of odor events and for comparison to the state standard for hydrogen sulfide. 
Air Quality Monitoring Network Plan – July 2013

20

As the Salton Sea is projected to recede, these sites could be enhanced for monitoring the 

predicted particulate matter (PM) emissions from the Salton Sea area that may influence 

the South Coast Air Basin PM levels.

Recent or Proposed Modifications to Network

Near Roadway NO2 Monitoring

On February 9, 2010, U.S. EPA promulgated new minimum monitoring requirements for the 

NO2 monitoring network in support of newly revised 1-hour NO2 NAAQS and the retained 

annual NAAQS. In the new monitoring requirements, State and Local air monitoring agencies 

are required to install near-road NO2 monitoring stations at locations where peak hourly NO2 

concentrations are expected to occur within the near-road environment in larger urban areas. On 

March 7, 2013 EPA revised the new monitoring requirements from the 2010 NO2 NAAQS 

revision, delaying implementation of the first phase of the near road network to January 1, 2014 

and the second phase to January 1, 2015. As part of the implementation, State and local air 

agencies are required to consider traffic volumes, fleet mix, roadway design, traffic congestion 

patterns, local terrain or topography, and meteorology in determining where a required near-road 

NO2 monitor should be placed. In addition to those required considerations, there are other 

factors that impact the selection and implementation of a near-road monitoring station including 

satisfying siting criteria, site logistics (e.g., gaining access to property and safety), and 

population exposure. 

The near roadway grant guidance directed implementation of near road sites be conducted in 

phases. Phase I sites are to be operational by January 1, 2014 and Phase II sites are to be 

operational by January 1, 2015. Each phase consists of one site selected from each of the Los 

Angeles – Long Beach – Santa Ana (Metropolitan Statistical Area (MSA) and the Riverside –

San Bernardino – Ontario MSAs. 

The primary objective of the near-road NO2 network is to place monitoring resources on nearroad locations where peak, ambient NO2 concentrations are expected to occur as a result of onroad mobile source emissions. Monitoring at such a location or locations within a particular 

urban area will provide data that can be used for comparison to the NAAQS and to assess 

population exposures for those who live, work, play, go to school, or commute within the nearroadway environment. The near-road NO2 data will provide a clear means to determine whether 

or not the NAAQS is being met within the near-road environment throughout a particular urban 

area. Since near-road NO2 monitoring sites are to be placed at locations with expected peak 

NO2 concentrations, the target mobile sources and the roads they travel upon are ubiquitous 

throughout urban areas, these monitoring data may be said to represent the relative worst case 

population exposures that may be occurring in the near-road environment throughout an urban 

area over the averaging times of interest.

Minimum monitoring requirements are specified in 40 CFR 58 Appendix D. EPA requires state 

and local air agencies to operate one near-road NO2 monitor in each Core Based Statistical Area 

(CBSA) with a population of 500,000 or more persons. Further, those CBSAs with 2,500,000 or 

more persons, or those CBSAs with one or more roadway segments carrying traffic volumes of 
Air Quality Monitoring Network Plan – July 2013

21

250,000 or more vehicles (as measured by annual average daily traffic [AADT] counts), shall 

have two near-road NO2 monitors. The process of identifying minimum monitoring 

requirements is shown in Figure A. 

The SCAQMD jurisdictional boundary encompasses two MSAs and two CBSAs whose 

boundaries and codes mirror those of the MSAs as defined by the U.S. Office of Management 

Figure A. Monitoring Requirements
Air Quality Monitoring Network Plan – July 2013

22

and Budget. The Los Angeles-Long Beach-Santa Ana MSA\CBSA (Code 31100) has an 

estimated population of 13,052,921 and the Riverside-San Bernardino-Ontario MSA\CBSA 

(Code 40140) has an estimated population of 4,350,096 according to U.S. Census estimates for 

2012. The minimum number of monitors required for near road monitoring is based on 

MSA\CBSA population and shown in Table 8.

TABLE 8. Minimum Number of Monitors Required Near Road NO2

The monitoring site selection process was in accordance with guidance published in the U.S. 

EPA Draft Near Roadway NO2 Technical Assistance Document (TAD) (December, 2011). The 

process for ranking candidate road segments is outlined in Figure B. 

CBSA

Population 

Estimate

Highest 

AADT 

Segment

Minimum Required Near 

Road NO2 Sites 2014

Minimum Required Near 

Road NO2 Sites 2015

31100 13,052,921 383,000 1 1

40140 4,350,096 256,000 1 1
Air Quality Monitoring Network Plan – July 2013

23

The candidate road segment ranking process incorporated the following EPA TAD 

considerations:

FE AADT – A single metric to compare road segments, accounting for AADT and fleet mix (Heavy 

Duty Vehicles). The Fleet-Equivalent AADT value for each road segment is calculated by the 

following formula: 

(FE) AADT = (AADT – HDc) + (HDm * HDc)

Where AADT is the total traffic volume count for a particular road segment, HDc is the total 

number of heavy-duty vehicles for a particular road segment, and HDm is a multiplier that 

represents the heavy-duty to light-duty NOx emission ratio for a particular road segment. An 

HDm of 17 was used instead of the default national average of 10 based on emissions inventories 

within the SCAQMD jurisdiction (Air Quality Management Plan, South Coast Air Quality 

Management District, 2012). The top 15 FE AADT segment candidates are shown in Table 9.

Figure B – Ranking Candidate Road Segments
Air Quality Monitoring Network Plan – July 2013

24

TABLE 9. Top Fifteen FE AADT Candidate Roadway Segments

FE 

ADDT 

Rank

HD 

Rank

AADT 

Rank

FE 

AADT

AADT 

Total

Total 

Trucks 

(HD)

Total 

Truck 

%

County Post 

mile Route

Description

1 20 4 732,828 343,000 23,770 6.93 LA 23.56 60 DIAMOND BAR, JCT. RTE. 57 SOUTH, ORANGE

2 1 38 731,843 263,000 28,588 10.87 LA 9.612 605 SANTA FE SPRINGS, JCT. RTE. 5, SANTA ANA

3 11 32 695,776 272,000 25,840 9.5 ORA 38.915 5 LINCOLN AVENUE

4 4 51 690,111 248,000 26,958 10.87 LA 13.569 605 WHITTIER, JCT. RTE. 72, WHITTIER BOULEVARD

5 21 14 685,400 299,000 23,561 7.88 LA 7.653 605 NORWALK, JCT. RTE. 105, GLENN ANDERSON 

FREEWAY

6 53 3 679,014 357,000 19,635 5.5 ORA 34 5 SANTA ANA, JCT. RTES. 22 AND 57, GARDEN

7 9 59 667,843 240,000 26,088 10.87 LA 17.407 605 INDUSTRY, JCT. RTE. 60, POMONA FREEWAY I

8 2 76 667,637 222,000 27,173 12.24 SBD 4.58 60 ONTARIO, JCT. RTE. 83

9 17 41 666,770 259,000 24,864 9.6 ORA 36.258 5 KATELLA AVENUE

10 3 77 664,620 221,000 27,050 12.24 SBD 2.366 60 CENTRAL AVENUE

11 15 54 656,842 245,300 25,094 10.23 SBD 9.936 10 ONTARIO, JCT. RTE. 15

11 16 54 656,842 245,300 25,094 10.23 SBD 11.132 10 ETIWANDA AVENUE

12 19 40 656,299 261,600 24,067 9.2 ORA 5.258 91 ANAHEIM, STATE COLLEGE BOULEVARD

13 7 75 652,729 223,000 26,203 11.75 LA 29.392 60 POMONA, JCT. RTE. 71, CHINO VALLEY FREEWAY

13 8 75 652,729 223,000 26,203 11.75 SBD 0 60 LOS ANGELES/SAN BERNARDINO COUNTY LINE

14 25 28 641,736 276,000 22,301 8.08 ORA 2.615 91 BUENA PARK, JCT. RTE. 39/BEACH BOULEVARD

15 12 83 636,004 215,000 25,671 11.94 SBD 5.855 60 GROVE AVENUE
Air Quality Monitoring Network Plan – July 2013

25

The process of ranking the roadway segments began with creating a scoring matrix incorporating 

EPA TAD considerations. The scoring matrix was used as a tool to determine the most suitable 

location for monitoring by incorporating traffic data and quantifying station siting 

considerations. FE AADT was weighted a factor of five due to the major role traffic influences 

near roadway monitoring. Other important factors such as roadway design, distance from 

roadway, meteorology, roadside structures and terrain were taken into consideration and 

weighted a factor of one each and are defined as follows:

Roadway Design – Considers monitor placement and can affect pollutant transport and 

dispersion. The most desirable attributes include a monitoring location at grade with the 

surrounding terrain and roadway. The least desirable attributes include deep cut-sections 

significantly below grade or significantly above grade.

Distance from Roadway - Per 40 CFR Part 58 Appendix E: the site should be “As near as 

practicable to the outside nearest edge of the traffic lanes of the target road segment; but shall not 

be located at a distance greater than 50 meters, in the horizontal, from the outside nearest edge of 

the traffic lanes of the target road segment.” The TAD recommends the target distance for nearroad NO2 monitor probes be within 20 meters of the target road whenever possible. 

Meteorology– Can affect pollution transport and dispersion. The most desirable location is 

relative downwind locations – winds from road to monitor. The least desirable locations are sites 

upwind of the target road. 

Roadside Structures – Considers monitor placement and can affect pollutant transport and 

dispersion. The most desirable monitoring location will have no barriers present other than low 

(< 2m in height) safety barriers or guard rails. The least desirable attributes include the presence 

of sound walls, mature vegetation (high and thick) or obstructive buildings.

Terrain – Can affect pollutant dispersion and local atmospheric stability. The most desirable 

terrain is flat or gentle terrain, within a valley, or along road grade. The least desirable terrain is 

along mountain ridges or peaks, hillsides, or other naturally windswept areas. 

A scale normalized to 5 was used to rank each candidate segment; the scoring matrix is shown as 

Table 10.
Air Quality Monitoring Network Plan – July 2013

26

TABLE 10. Candidate Segment Scoring Matrix

Score 5 3 1 0

FE AADT 

(Weighted 5x)

Traffic count of the 

highest ranked FE 

AADT

Normalized to the 

highest ranked FE 

AADT

Normalized to the 

highest ranked FE

AADT

N/A

Roadway Design At same elevation Slightly higher 

elevation

Below grade / 

Under overpass / 

On bridge

Design prevents access 

or accurate 

representation of 

roadway.

Distance from 

Roadway

Less than or equal to 

20 m

Normalized distance 

from 20 m to 50 m

50 m from 

roadway >50 m

Meteorology 

(predominant wind 

direction)

Downwind Parallel Upwind N/A

Roadside Structures No barriers ( < 2 m)

Some obstruction 

(small sound barriers 

sparse low 

vegetation)

Major obstruction 

(large sound walls, 

buildings).

Completely blocked

Terrain Flat / mildly sloping Uneven Mountain ridges, 

Canyons

Terrain prevents access 

or accurate 

representation of 

roadway

Weighting Values

FE AADT 5

Roadway Design 1

Distance from Roadway 1

Meteorology 1

Roadside Structures 1

Terrain 1

The top 15 FE AADT sites were surveyed and ranked according to the scoring matrix. Some 

sites had several locations within the road segment to consider and each location was scored 

individually as a sub-site. The results are shown for the Los Angeles-Long Beach-Santa Ana 

MSA\CBSA (Code 31100) and the Riverside-San Bernardino-Ontario MSA\CBSA (Code 

40140) in Tables 11 and 12.
Air Quality Monitoring Network Plan – July 2013

27

TABLE 11. Los Angeles-Long Beach-Santa Ana MSA\CBSA

Location

State College 

Blvd./Route 

91 Anaheim

Beach 

Blvd/Route 

91 Buena 

Park

Route 

710/Del 

Amo Long 

Beach

FE AADT Rank 12 14 25

FE AADT 656,299 641,736 610,072

HD Rank 19 25 10

HD 24,067 22,301 26,041

AADT Rank 40 28 112

AADT 261,600 276,000 183,000

Site 1A 1B 1C 2A 2B 3A 3B 4A 4B 5A 5B 6A 6B 7A 7B 7C 7D 9A 9B 9C 13A 16A 25A

FE AADT Score 5.00 5.00 5.00 4.99 4.99 4.75 4.75 4.71 4.71 4.68 4.68 4.63 4.63 4.56 4.56 4.56 4.56 4.55 4.55 4.55 4.48 4.38 4.16

Roadway Design 4.5 4.0 5.0 4.5 4.5 4.0 5.0 3.0 5.0 1.0 2.0 4.0 5.0 5.0 2.0 2.0 4.0 3.0 3.0 1.0 1.0 1.0 5.0

Distance from 

Roadway 5.0 5.0 5.0 5.0 2.5 3.7 5.0 4.0 4.0 2.2 0.0 1.2 3.6 4.0 3.6 2.6 3.3 0.0 3.2 2.5 3.2 2.1 5.0

Meteorology 5.0 5.0 1.0 1.0 1.0 5.0 5.0 3.0 3.5 3.0 4.0 1.0 3.5 1.0 2.5 5.0 3.0 4.0 4.0 4.0 4.0 5.0 5.0

Roadside Structures 5.0 4.0 1.0 3.0 5.0 5.0 5.0 3.0 4.0 1.0 1.0 4.0 4.0 4.0 1.0 1.0 1.0 2.5 2.5 2.5 1.0 1.0 5.0

Terrain 4.0 4.0 4.0 4.0 3.0 3.0 5.0 2.0 5.0 4.0 4.0 4.0 5.0 5.0 2.0 2.0 3.5 3.0 3.0 3.0 3.0 3.0 5.0

Sum (Out of 50) 4.85 4.70 4.10 4.25 4.10 4.44 4.87 3.85 4.50 3.46 3.44 3.74 4.42 4.18 3.39 3.54 3.76 3.52 3.85 3.57 3.46 3.40 4.58

Overall Ranking 2 4 12 9 12 7 1 14 6 23 24 17 8 10 27 21 16 22 14 19 23 26 5

343,000

Route 5/605 

Santa Fe 

Springs

Route 

5/Lincoln 

Anaheim

Route 

605/72 

Whittier

731,843 695,776 690,111

Route 57/60 

Diamond Bar

1

732,828

24

23,770

4

Route 

5/22/57 

Orange Route 605/60 Industry

2 3 4 5 6 7

Route 

605/105 

Norwalk

26,088

679,014 667,843

1 14 4 25 59 12

685,400

28,588 25,840 26,958 23,561 19,635

666,770

21

263,000 272,000 248,000 299,000 357,000 240,000

38 32 51 14 3 59

Route 5/Katella 

Anaheim

9

259,000

24,864

41
Air Quality Monitoring Network Plan – July 2013

28

TABLE 12. Riverside-San Bernardino-Ontario MSA\CBSA

Location

Route 

60/83 

Ontario

Route 

10/Etiwanda 

Fontana

Route 60/71 

Chino

Route 60 /LA/SB 

County Line 

Chino

Grove Ave/Route 

60 Ontario

FE AADT Rank 8 11 13 13 15

FE AADT 667,637 656,842 652,729 652,729 636,004

HD Rank 2 20 7 8 12

HD 27,173 25,094 26,203 26,203 25,671

AADT Rank 76 54 75 75 83

AADT 222,000 245,300 223,000 223,000 215,000

Site 8A 10A 10B 10C 11A 11B 12A 14A 15A 17A

FE AADT Score 4.56 4.53 4.53 4.53 4.48 4.48 4.48 4.45 4.45 4.34

Roadway Design 3.0 2.0 2.0 2.0 4.0 3.0 5.0 1.0 1.0 3.0

Distance from Roadway 2.0 3.3 3.3 4.0 0.0 1.7 5.0 4.0 2.6 4.5

Meteorology 3.5 2.5 2.5 3.0 3.0 4.0 5.0 3.0 3.0 4.0

Roadside Structures 2.5 3.0 4.0 3.0 5.0 1.0 5.0 1.0 3.0 4.0

Terrain 3.5 2.0 4.0 4.0 4.0 2.0 5.0 3.0 3.0 4.0

Sum (Out of 50) 3.73 3.55 3.85 3.87 3.84 3.41 4.74 3.43 3.48 4.12

Overall Ranking 18 20 14 13 15 26 3 25 22 11

Route 60/Central 

Chino

Route 10/15 

Ontario

10 11

664,620 656,842

3 19

27,050 25,094

77 54

221,000 245,300
Air Quality Monitoring Network Plan – July 2013

29

Level of Service (congestion) data is considered to differentiate between two comparatively 

ranked segments as part of the site selection process. Tables 13, 14 and 15 show the top 

congested freeways in the Los Angeles, Orange, and the Riverside-San Bernardino-Ontario 

MSA\CBSA for the 3rd quarter 2012.

TABLE 13. Top Congested Freeways Los Angeles County

TABLE 14. Top Congested Freeways Orange County
Air Quality Monitoring Network Plan – July 2013

30

TABLE 15. Top Congested Freeways Riverside & San Bernardino Counties

On January 23, 2013 a Near Roadway Monitoring workshop was held at SCAQMD’s Diamond 

Bar office. EPA along with SCAQMD staff presented and held a discussion on SCAQMD’s 

progress and implementation plan for the Near Roadway monitoring requirements. The 

workshop was attended by approximately 17 members of the public. Comments were solicited 

at the conclusion of the workshop and no written comments were received regarding selection 

criteria or proposed sites.

Sites are selected based on their ranking in the scoring matrix however there are other 

considerations involved in the site selection process. These considerations include:

Safety - Near-road monitoring sites must be accessible to station operators in a safe and legal 

manner, and not pose safety hazards to drivers, pedestrians, or nearby residents. Safety hazards to 

monitoring site operators include factors which inhibit the safe entrance to or egress from a site and 

factors that could allow vehicles to encroach upon and damage the site infrastructure.

Accessibility – ability to access the desired location from the property owner or ability to obtain a 

right of way permit.

Infrastructure – availability of power and data connection at the site.

The projected timeline for installation and operation of the near roadway monitoring sites is as 

follows:

Date Activity

January to June 2013 Finalize site selection process for phase I implementation.

Include in Annual Network Plan.

Obtain permission and or permits for highest ranking sites.

July 2013 Site survey with construction manager.

July to November 2013 Site preparations (construction, utility installation etc.)
Air Quality Monitoring Network Plan – July 2013

31

November to December 2013 Instrument installation and field quality control checks.

January 2014 Collection and reporting of data for phase I.

January 2014 to June 2014 Finalize site selection process for phase II implementation.

Include in Annual Network Plan.

Obtain permission and or permits for highest ranking sites.

July 2014 Site survey with construction manager.

July to November 2014 Site preparations (construction, utility installation etc.)

November to December 2014 Instrument installation and field quality control checks.

January 2014 Collection and reporting of data for phase II.

Following startup date, the continuous operation of instrumentation and meteorological data is 

ongoing with data reported to AQS and AIR/Now.

Van Nuys Pb Monitoring Site

On November 12, 2008, the EPA issued final revisions to the NAAQS for Pb. Network design 

requirements included monitoring for sources of Pb (source oriented monitoring) and urban Pb 

monitoring (non-source oriented). To meet this requirement, a source oriented site was

established on January 1, 2010 at the Van Nuys Airport. The final rule for Pb went into effect on 

January 26, 2011. In the final rule the Van Nuys Airport was no longer included on the list of 

airports where lead monitoring was required, and the most recent emissions inventory showed Pb

emissions less than 1 ton per year. The data from the Van Nuys Airport Pb site is currently 

under review to determine the need for continued monitoring. SCAQMD is currently in 

consultation with EPA Region IX to determine the need for continued monitoring. Prior to 

discontinuance of monitoring a waiver will be obtained from EPA Region IX.

Sulfate Monitoring

SCAQMD has been monitoring TSP sulfate data at the Azusa, Fontana, Pasadena, and West Los

Angeles monitoring since the inception of the monitoring sites. In 2003, ARB revised the 

sulfates monitoring method and standard by deleting the TSP sulfates method, ARB method 

MLD 033, and replaced it with the existing ARB method and creating a new standard for PM10 

sulfates, ARB method MLD 007. ARB conducted a comparison of SCAQMD PM10 and TSP 

sulfate data for 1999 though 2010 and found good correlation between the two methods. TSP 

sulfate data was reviewed in consultation with EPA and ARB who determined the need did not 

exist for continued TSP sulfate monitoring and a waiver was not necessary since the rule no 

longer exists. TSP sulfate monitors were removed from the Pasadena and West LA monitoring 

sites. The TSP sulfate monitors will continue at the Azusa and Fontana sites through the end of 

the MATES IV program. 

Pasadena

SCAQMD has been operating the Pasadena site since 1982. The deteriorating state of the shelter 

along with compromises made to the siting criteria due to obstructions has made it a candidate 

for site improvement. As part of regular air monitoring station maintenance, the station shelter 

was replaced in FY 2012-13. No changes have been made to the location or siting of the shelter.
Air Quality Monitoring Network Plan – July 2013

32

Crestline

SCAQMD has been operating the Crestline site since 1973. The deteriorating state of the shelter 

along with compromises made to the siting criteria due to obstructions has made it a candidate 

for site improvement. As part of regular air monitoring station maintenance, a new station shelter 

has been ordered to replace the existing trailer during FY 2013-14.

West LA

SCAQMD has been operating the West LA site since 1983. The deteriorating state of the shelter 

along with compromises made to the siting criteria due to obstructions has made it a candidate 

for site improvement. As part of regular air monitoring station maintenance, a new station shelter 

has been ordered to replace the existing trailer during FY 2013-14.

Riverside Magnolia

SCAQMD has been operating the Riverside Magnolia site since 1972. The deteriorating state of 

the building along with compromises made to the siting criteria due to obstructions has made it a 

candidate for site relocation. SCAQMD in consultation with EPA Region IX has located a 

candidate site for relocation. During the FY 2013-14 a data comparison between the sites will be 

undertaken. If comparison of data between the two locations demonstrates some comparability, 

the Riverside site may be relocated in consultation with EPA Region IX.

South Long Beach

SCAQMD has been operating the South Long Beach station as part of the ambient airmonitoring network. Recent construction of the buildings adjacent to our air monitoring 

equipment compromises the siting criteria. During the FY 2013-14 a data comparison between a 

more centralized monitoring location in Long Beach will be undertaken. If comparison of data 

between the two locations demonstrates some comparability, or if the metropolitan site shows 

consistently higher levels of PM, the South Long Beach site may be relocated in consultation 

with EPA Region IX.

Air Monitoring Station Improvements

As part of the actions to enhance quality of data collected, SCAQMD will replace existing 

deteriorated shelters at the Indio, San Bernardino, West Los Angeles and Perris monitoring sites. 

The new shelters will be installed at the same locations as the existing structures.

PAMS

SCAQMD currently operates five upper air meteorological stations within the South Coast Air 

Basin, as part of the PAMS program, using remote sensing technologies. Sites include:

Los Angeles International Airport (LAX), Los Angeles County

Whiteman Airport (WHP), Pacoima, Los Angeles County

Ontario International Airport (ONT), San Bernardino County

Moreno Valley (MOV), Riverside County

Irvine (IRV), Orange County

Sites utilize the Scintec Corporation LAP-3000 915 MHz boundary layer radar wind profilers 

(RWP) with radio acoustic sounding systems (RASS), as well as some Atmospheric Systems 
Air Quality Monitoring Network Plan – July 2013

33

Corporation miniSodars to help collect winds in the lowest layers. The wind profiler network is 

larger than most areas due to the complex terrain and meteorological characteristics of the South 

Coast Air Basin. 

The LAP-3000 RWP systems at all five stations were evaluated extensively on-site by Scintec in 

February 2013. Relatively routine problems were found at the monitoring sites and are currently 

being repaired, however there were more significant problems found with the LAX RWP. The 

LAX RWP is the oldest system, built in the early 1990s and installed in 1994 after being used 

for a field campaign. Issues include:

Final Amplifier failure (both final amp and pre-amp do not meet output specifications).

Discrete parts no longer available to repair subsystems.

Radar Antenna failure (defective antenna RF dividers; return signal loss). 

Antenna Phase Shifter likely to fail soon due to corrosion.

The cost for the replacement subsystems to repair the existing RWP is $178,000, plus tax and 

shipping, including a new antenna, phase shifter and final amplifier. In addition it is necessary to 

replace the aging computer and electronics (Modulator/IF/Interface unit and Power Supply) with 

a whole new RWP system would cost approximately $270,000 total, plus tax and shipping. Due 

to the cost of repairing the current LAX system, as well as the cost of maintaining the network of 

upper air stations in the South Coast Air Basin, SCAQMD proposes to reduce the size of the 

network. After consideration of the data needs and priorities, we propose closing the Whiteman 

Airport upper air station, and using those components to maintain the LAX RWP. The LAX 

station is a key location for upper air data for analyses, forecasting and modeling activities in the 

Basin. The Whiteman Airport system is the newest and best suited for the environment at LAX.

Minimum Monitoring Requirements

The SCAQMD jurisdictional boundary encompasses two MSAs and two CBSAs whose 

boundaries and codes mirror those of the MSAs as defined by the U.S. Office of Management 

and Budget. Los Angeles-Long Beach-Santa Ana MSA\CBSA (Code 31100) has an estimated 

population of 13,052,921 and the Riverside-San Bernardino-Ontario MSA\CBSA (Code 40140) 

has an estimated population of 4,350,096 according to U.S. Census estimates for 2012. The 

minimum number of monitors for each pollutant is based on MSA population as described in 40 

CFR § 58 Appendix D. The SCAQMD is a Primary Quality Assurance Organization (PQAO) 

and the network exceeds the minimum monitoring requirements for all criteria pollutants. 

Details are provided below.

 
Air Quality Monitoring Network Plan – July 2013

34

Table 16 Minimum Monitoring Requirements for Ozone.

(Note: Refer to section 4.1 and Table D-2 of Appendix D of 40 CFR Part 58.)

MSA Counties Population and 

Census Year

8-hr Design 

Value (ppb) DV, 

Years1

Design Value Site 

(name AQS ID0

Monitors 

Required

Monitors 

Active

Monitors 

Needed

31100 Los Angeles 

Orange

13,052,921, 

2012

96, 

2009-2012

Santa Clarita

060376012 4 17 0

40140 San Bernardino

Riverside

4,350,096, 

2012

106, 

2009-2012

Crestline

060710005 3 12 0

1DV Years – The three years over which the design value was calculated.

Monitors required for SIP or Maintenance Plan: 29

Table 17a Minimum Monitoring Requirements for PM2.5 SLAMS (FRM/FEM/ARM)

(Note: Refer to sections 4.71, 4.72, and Table D-5 of Appendix D of 40 CFR Part 58.)

MSA Counties

Population 

and Census 

Year

Annual 

Design 

Value 

[ug/m3], 

DV & 

Years1

Annual 

Design Value 

Site (Name, 

AQS ID)

Daily 

Design 

Value 

[ug/m3], 

DV &

years

Daily 

Design 

Value site 

(name AQS 

ID)

# Required 

SLAMS

Monitors

# Active 

SLAMS 

Monitors

# 

Additional 

SLAMS 

needed

31100

Los 

Angeles 

Orange

13,052,921, 

2012

12.6, 

2009-2012

Los Angeles

060371103

32.2,

2009-2012

Burbank

060371002 3 11 0

40140

San 

Bernardino

Riverside

4,350,096, 

2012

15.2, 

2009-2012

Mira Loma

060658005

36.2,

2009-2012

Mira Loma

060658005 3 9 0

1DV Years – The three years over which the design value was calculated.
Air Quality Monitoring Network Plan – July 2013

35

Table 17b Minimum Monitoring Requirements for Continuous PM2.5 Monitors (FEM and 

Non-FEM)

*

(FEM/ARM and non-FEM see 40 CFR 58 Appendix D Section 4.72.)

MSA Counties

Population 

and Census 

Year

Annual 

Design 

Value 

[ug/m3], 

DV &

Years1

Annual 

Design 

Value Site 

(Name, 

AQS ID)

Daily 

Design 

Value 

[ug/m3], 

DV & 

years

Daily Design 

Value site 

(name AQS 

ID)

# Required 

Continuous 

Monitors

# Active 

Continuous 

Monitors

# 

Additional 

Continuous

needed

31100 Los Angeles 

Orange

13,052,921, 

2012

18.9,

2009-2012

Los Angeles

060371103

45.3,

2009-2012

Los Angeles

060371103 2

5-FEM

3-Non FEM 0

40140

San 

Bernardino

Riverside

4,350,096, 

2012

21.3, 

2009-2012

Mira Loma

060658005

42.21,

2009-2012

Mira Loma

060658005 2

2-FEM

6-Non FEM 0

1DV Years – The three years over which the design value was calculated.

Monitors required for SIP or Maintenance Plan: 16

* Currently all active continuous monitors do not meet acceptance criteria under 78 FR 3086 (Appendix C) and is 

requested to not be compared to the NAAQS. 

Table 17c Minimum Monitoring Requirements for Speciated PM2.5 Monitors 

(Note: Refer to sections 4.74 of Appendix D of 40 CFR Part 58.)

MSA Counties

Population 

and Census 

Year

Monitors 

Required1

Monitors 

Active

Monitors 

Needed

31100 Los Angeles 

Orange

13,052,921, 

2012 1 2 0

40140

San 

Bernardino

Riverside

4,350,096, 

2012 1 2 0

1

sites designated as part of the PM2.5 Speciation Trends Network (STN).
Air Quality Monitoring Network Plan – July 2013

36

Table18 Minimum Monitoring Requirements for PM10

(Note: Refer to section 4.6 and Table D-4 of Appendix D of 40 CFR Part 58.)

MSA Counties

Population 

and Census 

Year

Max 

Concentration 

[ug/m3]

Max 

Concentration 

site (name AQS 

ID)

# Required 

Monitors

# Active 

Monitors

# Additional 

Monitors 

Needed

31100 Los Angeles 

Orange

13,052,921, 

2012 80 Los Angeles060371103

4-8

Med Conc 9 0

40140

San 

Bernardino

Riverside

4,350,096, 

2012 124 Indio,060652002

6-10

High Conc 12 0

Monitors required for SIP or Maintenance Plan: 21

Table 19 Minimum Monitoring Requirements for NO2

(Note: Refer to section 4.3 of Appendix D of 40 CFR Part 58.)

CBSA

Population 

and Census 

Year

Max 

AADT 

Counts 

(2010)

1

# Required 

Near Road 

Monitors2

#Active 

Near Road 

Monitors3

#Additional 

Near Road 

Monitors 

Needed4

#Required 

Area Wide 

Monitors

#Active 

Area Wide 

Monitors

#Additional 

Area wide 

Monitors 

Needed

31100 13,052,921, 

2012

357,000,

2010 0 0 0 1 17 0

40140 4,350,096, 

2012

245,300,

2010 0 0 0 1 8 0

1Max AADT Counts – 2011 is the latest data available from CA DOT; traffic volumes in California have decreased avg. 1.1% 

from 2010.

2Two required beginning January 1, 2014.

3Two required sites to be active by January 1, 2014. See schedule in Recent or Proposed Changes to Network, Near Road 

Monitoring.

4One additional site per CBSA to be active by January 1, 2015. See schedule in Recent or Proposed Changes to Network, Near 

Road Monitoring.

Monitors required for SIP or Maintenance Plan: 15

Monitors Required for PAMS: 7

EPA Regional Administrator-required monitors per 40 CFR 58, Appendix D 4.3.4: 3
Air Quality Monitoring Network Plan – July 2013

37

Table 20 Minimum Monitoring Requirements for SO2

(Note: Refer to section 4.4 of Appendix D of 40 CFR Part 58.)

CBSA Counties Total SO21

[tons/year]

Population Weighted Emissions 

Index2

[million persons-tons per year]

#Active 

Near Road 

Monitors

#Required 

Area 

Wide 

Monitors

#Active 

Area 

Wide 

Monitors

#Additional 

Area wide 

Monitors 

Needed

31100 Los Angeles 

Orange

13,052,921, 

2012 157,455 0 2 5 0

40140

San 

Bernardino

Riverside

4,350,096, 

2012 11,097 0 1 2 0

1Using latest NEI data 2008 Version 2, available on EPA website: http://www.epa.gov/ttn/chief/net/2008inventory.html

2Calculated by multiplying CBSA population and total SO2 and dividing product by one million.

Monitors required for SIP or Maintenance Plan: 7

EPA Regional Administrator-required monitors per 40 CFR 58, Appendix D 4.4.3: 0

Table 21 Minimum Monitoring Requirements for CO

(Note: Refer to section 4.2 of Appendix D of 40 CFR Part 58.)

CBSA

Population 

and Census 

Year

#Required 

Near Road 

Monitors1

#Active 

Near 

Road 

Monitors2

#Required 

Area 

Wide 

Monitors

#Active 

Area 

Wide 

Monitors

31100 13,052,921, 

2012 0 0 0 17

40140 4,350,096, 

2012 0 0 0 8

1Required beginning January 1, 2015

2Required sites to be active by January 1, 2015; to be implemented concurrently with near road NO2 sites.

Monitors required for SIP or Maintenance Plan: 25

EPA Regional Administrator-required monitors per 40 CFR 58, Appendix D 4.4.2: 0

Table 22a Minimum Monitoring Requirements for Pb at NCore

(Note: Refer to section 4.5 of Appendix D of 40 CFR Part 58.)

NCore Site

(name, AQS ID)

CBSA Population and 

Census Year

# Required 

Monitors

# Active Monitors # Additional 

Monitors Needed

Los Angeles (Main Street)

060371103 31100 13,052,921, 2012 1 1 0

Rubidoux

060658001 40140 4,350,096, 2012 1 1 0
Air Quality Monitoring Network Plan – July 2013

38

Table 22b Source Oriented Pb Monitoring (Including Airports)

(Note: Refer to section 4.5 of Appendix D of 40 CFR Part 58.)

1Consider data from past three years.

2Data found at http://www.epa.gov/ttn/chief/net/2008inventory.html (5/1/2013)

Monitors Required for SIP or Maintenance Plan: 5

EPA Regional Administrator required monitors per 40 CFR 58, Appendix D 4.5(C) c: 0

Table 22c Minimum Monitoring Requirements for Pb Non Source Monitoring 

(Note: Refer to section 4.5 of Appendix D of 40 CFR Part 58.)

CBSA Population and 

Census Year

# Required Area 

Wide Monitors

# Active Area Wide 

Monitors

# Additional 

Monitors Needed

31100 13,052,921, 

2012 0 5 0

40140 4,350,096,

2012 0 3 0

Source Name Address

Pb Emissions1 

(tons per year)

Emission Inventory 

Source2 and Data Year

Max 3-Month Design 

Value1 [ug/m3]

Design Value 

Date(third month, 

year)

# Required 

Monitors

# Active 

Monitors

# Additional 

Monitors Needed

Long Beach Airport 

Daugherty Field

4100 E Donald Douglas 

Dr, Long Beach, CA 

90808

1.02528004 NEI 2008 Version 2 Unavailable Unavailable

Pending 5 

year 

assessment

0 1

Van Nuys Airport 16461 Sherman Way, Van 

Nuys, CA 91406 0.7659205 NEI 2008 Version 2 0.06 7; 2012 1 1 0

Exide Technologies 2700 S Indiana St, Vernon, 

CA 90058 0.511995 NEI 2008 Version 2 0.46 7; 2011 1 2 0

Trojan Battery 9440 Ann St., Santa Fe 

Springs, CA 90670 0.0177 NEI 2008 Version 2 0.11 4; 2011 0 1 0

Quemetco Inc. 720 S 7th Ave, City Of 

Industry, CA 91746 2.08123E-06 NEI 2008 Version 2 0.11 7; 2010 0 1 0

TAMCO

12459-B Arrow Route, 

Rancho Cucamonga, CA 

91739

0.124448391 NEI 2008 Version 2 Unavailable Unavailable 0 1 0
Air Quality Monitoring Network Plan – July 2013

39

Table 23 Minimum Monitoring Requirements for PAMS

(Note: Refer to section 4.5 of Appendix D of 40 CFR Part 58.)

Table 24 Collocated Manual PM2.5, PM10, and Non-NCore Pb Networks

(Note: Refer to section 3.2.5, 3.3.5, 3.3.1, and 3.3.4.3 of Appendix A, 40 CFR Part 58.)

Table 25 Collocated Automated (continuous) PM2.5 Network 

(Note: Refer to section 3.2.5 & 3.3.5 of Appendix A, 40 CFR Part 58.)

1No FEM PM2.5 BAMs are listed as primary monitors; therefore no collocation requirement exists but all are collocated with 

FRM monitors.

Area Type # Required PAMS 

Sites

# Active PAMS 

Sites

# PAMS Sites 

Needed

SCAQMD 

Monitoring Area

1 or 3 1 3 0

2 1 4 0

4 0 0 0

Upper Air 

Meteorology 1 5 0

Pollutant Method Code # Primary 

Monitors

# Required 

Collocated Monitors

# Active Collocated 

Monitors

PM2.5 (RAAS) 120 20 3 3

PM10 (SSI Hi-Vol) 063 21 3 3

Pb (TSP Hi-Vol) 110 (Non Source) 8 1 2

Pb (Tsp Hi-Vol) 110 (Source) 5 1 1

Method Code

1 # Primary 

Monitors

# Required 

Collocated Monitors

# Active Collocated 

Monitors

None 0 0 0
Air Quality Monitoring Network Plan – July 2013

40

Data Submittal and Archiving Requirements

As required in 40 CFR 58.16(a), data has been reported via AQS including all ambient air quality 

data and associated quality assurance data for SO2, CO, O3, NO2, NO, NOy, NOX, Pb-TSP 

mass concentration, Pb-PM10 mass concentration, PM10 mass concentration, PM2.5 mass 

concentration, filter-based PM2.5 FRM/FEM field blank mass, sampler-generated average daily 

temperature, and sampler-generated average daily pressure, chemically speciated PM2.5 mass 

concentration data, PM10-2.5 mass concentration, meteorological data from NCore and PAMS 

sites, average daily temperature\average daily pressure for Pb sites and metadata 

records\information as specified by the AQS Data Coding Manual through December 31, 2012. 

A data certification letter has been submitted to the EPA Regional Administrator certifying data 

collected at all SLAMS and at all FRM, FEM, and ARM SPM stations that meet criteria in 

appendix A, to part 58, for January 1 through December 31, 2012. 
Air Quality Monitoring Network Plan – July 2013

APPENDIX A

SCAQMD Network Depictions
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A-1

Figure 1 SCAQMD Ozone Monitoring Locations
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A-2

Figure 2 SCAQMD PM10 Monitoring Locations
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A-3

Figure 3 SCAQMD Monitoring Locations for Nitrogen Dioxide
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A-4

Figure 4 SCAQMD Monitoring Locations for Carbon Monoxide
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A-5

Figure 5 SCAQMD Monitoring Locations for Sulfur Dioxide
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A-6

Figure 6 SCAQMD Source and Ambient Particulate Lead Monitoring Locations
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A-7

Figure 7 SCAQMD PAMS Monitoring Locations
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A-8

Figure 8 SCAQMD PM2.5 Monitoring Locations B = BAM FEM

B1 = BAM
Air Quality Monitoring Network Plan – July 2013

B-1

APPENDIX B

Detailed Site Information

Detailed information for air monitoring locations are included in site reports. For information on 

monitoring objectives, purposes and scales, please refer to the main text of this plan.

 Anaheim

 ATSF (Exide)

 Azusa

 Banning Airport

 Big Bear

 Burbank

 Closet World (Quemetco)

 Compton

 Costa Mesa

 Crestline

 Fontana

 Glendora

 Indio

 La Habra

 Lake Elsinore

 LAX Hastings

 Long Beach North

 Long Beach South

 Los Angeles

 Mira Loma (Van Buren)

 Mission Viejo

 Norco

 Ontario Fire Station

 Palm Springs

 Pasadena

 Perris

 Pico Rivera #2

 Pomona

 Redlands

 Rehrig (Exide)

 Reseda

 Riverside

 Rubidoux

 San Bernardino

 Santa Clarita

 Temecula

 Uddelholm (Trojan Battery)

 Upland

 Van Nuys Airport

 West Los Angeles
Air Quality Monitoring Network Plan – July 2013

B-2

Table 26 Selected POC, Parameter and Method Codes

Instrument Pollutant POC Code Method 

Code Parameter Code

910 NATTS VOCs 4 172

43218, 43372, 43505, 43551, 43552, 

43802, 43803, 43804, 43815, 43817, 

43824, 43829, 43843, 43860, 45109, 

45201, 45202, 45203, 45204, 45220, 

45805, 45807.

910 PAMS VOCs 2, 7, 2, or 8 126

43000, 43102, 43202, 43203, 43204, 

43205, 43206, 43212, 43214, 43216, 

43217, 43220, 43221, 43224, 43226, 

43227, 43230, 43231, 43232, 43233, 

43235, 43238, 43242, 43243, 43244, 

43245, 43247, 43248, 43249, 43250, 

43252, 43253, 43261, 43262, 43263, 

43280, 43284, 43285, 43291, 43954, 

43960, 45109, 45201, 45202, 45203, 

45204, 45207, 45208, 45209, 45210, 

45211, 45212, 45213, 45218, 45219, 

45220, 45225.

ATEC 8000 PAMS Carbonyls 2 or 8 102 43502, 43503.

GMW 1200 PM10 1,2,4, or 6 063 or 102 81102, 85101, 82203, 82308, 82403.

Anderson RAAS PM2.5 Particulate 1 or 2 780 68108, 68107, 68106, 68105, 68104, 

68103, 68101, 68109, 68102

Anderson RAAS PM2.5 Particulate 1 or 2 120 88101

Met One SASS Speciated PM2.5 11 or 12 812 88301, 88306, 88302, 88403.

Met One SASS Speciated PM2.5 11 or 12 810 68108, 68107, 68106, 68105, 68104, 

68103, 88502.

Met One SASS Speciated PM2.5 11 or 12 780 68101, 68109, 68102.

Met One SASS Speciated PM2.5 11 or 12 811

88102, 88103, 88107, 88110, 88111, 

88118, 88115, 88112, 88113, 88114, 

88126,88128, 88132, 88134, 88136, 

88152, 88180, 88176, 88154, 88165, 

88168, 88169, 88160, 88161, 88179, 

88164, 88183, 88167.

Met One SASS Speciated PM2.5 11 or 12 816 88380, 88383, 88384, 88385, 88370, 

88374, 88375, 88376, 88377.

Xontech 924 CR6 4 or 5 920 12115

Xontech 924 Carbonyls 4 102 43502, 43503.

Xontech 924 Metals 2 or 4 110 85102, 85103, 85105, 85110, 85128, 

85132, 85136.
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C-1

APPENDIX C

PM2.5 Continuous Monitor Comparability Assessment and Request 

for Waiver

Introduction

The SCAQMD monitoring program has historically operated PM2.5 continuous monitors 

primarily to support forecasting and reporting of the Air Quality Index (AQI). These monitors 

supply data every hour to update the AQI on our web site as well as national web sites such as 

AIRNow (www.airnow.gov). SCAQMD has been using these monitors since the early part of the 

last decade as we implemented the PM2.5 monitoring program. Over the last few years, a 

number of PM2.5 continuous monitors have been approved as Federal Equivalent Methods 

(FEMs). By utilizing an approved FEM, any subsequent data produced from the method may be 

eligible for comparison to EPA’s health based standard known as the NAAQS. The primary 

advantage of operating a PM2.5 continuous FEM is that it can support the AQI, while also 

supplying data that are eligible for comparison to the NAAQS. Thus, a network utilizing PM2.5

continuous FEMs can potentially lower the number of filter-based FRMs operated in the 

network, which are primarily used for comparison to the NAAQS. These filter-based FRMs are 

resource intensive in that they require field operations as well as pre- and post-sampling 

laboratory analysis which results in data not being available for approximately 2-4 weeks after 

sample collection. 

The SCAQMD monitoring program has been evaluating PM2.5 continuous FEMs over the past 

several years. Although the PM2.5 continuous FEMs are automated methods, these methods still 

require careful attention in their set-up, operation, and validation of data. Once enough data was 

collected, we began to evaluate the performance of these methods compared to collocated FRMs. 

That evaluation is explained further below and includes our request regarding the use of the data 

from these methods.

Request for Exclusion of PM2.5 Continuous FEM data from Comparison to the NAAQS

The network technical requirements for requesting exclusion of data from comparison to the 

NAAQS are identified in 40 CFR §58.11(e). These requirements refer to the performance criteria 
Air Quality Monitoring Network Plan – July 2013

C-2

described in Table C-4 to subpart C of part 53. To accommodate the differences in how routine 

monitoring agencies operate their networks, several additional provisions are described in 

§58.11(e). When a topic is not addressed in §58.11(e), then the test specifications from table C-4 

applies. 

As shown in the Table below, the slope of the regression between collocated FRM and FEM 

measurements at the Anaheim, Burbank, Central Los Angeles, North Long Beach, South Long 

Beach, and Rubidoux (Cont POC 3) stations is higher than 1.1, which is outside the test 

specification indicated in §53 Table C-4 (i.e. slope = 1 ± 0.1). Although the slope criteria was 

met, the intercept of the regression relationship between FRM and FEM data at the Rubidoux 

(Cont POC 9) and Mira Loma monitoring sites does not meet the test specifications of between 

15.05 - (17.32 × slope), but not less than -2.0; and 15.05 – (13.20 × slope), but not more than 

+2.0 (also indicated in §53 Table C-4).

Thus, in accordance with the PM NAAQS rule published on January 15th, 2013 (78 FR 3086) 

and specific to the provisions detailed in §58.10 (b)(13) and §58.11 (e), SCAQMD is requesting 

that data from the all of the SCAQMD FEM PM2.5 monitors be set aside for comparison to the 

NAAQS. While SCAQMD is working to optimize the monitoring instrumentation to meet all of 

our monitoring objectives, the performance is not yet at a point where the comparability of the 

PM2.5 continuous FEMs operated in our network compared to collocated FRMs is acceptable. 

After assessing the comparability of the PM2.5 FEMs to the collocated FRMs for our network, 

the sites listed below do not meet the comparability requirements. Detailed one-page assessments 

from which the information described below was obtained are included at the end of this section.
Air Quality Monitoring Network Plan – July 2013

C-3

Table – Request for Exclusion of PM2.5 Continuous FEM Data

Site Name City Site ID Cont 

POC

Cont

Method Description

PM2.5 

Cont 

Begin 

Date

PM2.5 

Cont 

End 

Date

Continuous/ 

FRM 

Sampler 

Pairs Per 

Season

Slope 

(m)

Intercept 

(y)

Meets Bias 

Requirement

Correlation 

(r)

Sites with PM2.5 continuous FEMs that are collocated with FRMs

Anaheim Anaheim 06-059-

0007 3

Met-One BAM 

1020 w/VSCC

01/01/

2010

12/31/

2012

Winter = 247

Spring = 269

Summer = 241

Fall = 244

Total = 1001

1.16 2.83 No 0.94

Burbank Burbank 06-037-

1002 3

Met-One BAM 

1020 w/VSCC

01/01/

2010

12/31/

2012

Winter = 260

Spring = 211

Summer = 255

Fall = 244

Total = 970

1.14 3.81 No 0.91

Central Los 

Angeles

Los 

Angeles

06-037-

1103

3

Met-One BAM 

1020 w/VSCC

01/01/

2009

09/29/

2011

Winter = 226

Spring = 161

Summer = 170

Fall = 182

Total = 739

1.21 1.77 No 0.93

9

Met-One BAM 

1020 w/VSCC

10/01/

2011

12/31/

2012

Winter = 92

Spring = 76

Summer = 74

Fall = 142

Total = 384

1.11 5.33 No 0.81

North Long 

Beach

Long 

Beach

06-037-

4002 3

Met-One BAM 

1020 w/VSCC

01/01/

2010

12/31/

2012

Winter = 221

Spring = 231

Summer = 268

Fall = 249

Total = 969

1.16 1.67 No 0.93

South Long 

Beach

Long 

Beach

06-037-

4004 3

Met-One BAM 

1020 w/VSCC

01/01/

2012*

12/31/

2012

Winter = 72

Spring = 91

Summer = 57

Fall = 34

Total = 254

1.29 -0.48 No 0.96
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C-4

Riverside/

Rubidoux Rubidoux 06-065-8001

3

Met-One BAM 

1020 w/PM2.5 SCC

01/01/

2010

07/31/

2011

Winter = 101

Spring = 57

Summer = 224

Fall = 264

Total = 646

1.19 0.51 No 0.90

9

Met-One BAM 

1020 w/VSCC

08/02/

2011

12/31/

2012

Winter = 88

Spring = 75

Summer = 127

Fall = 175

Total = 465

1.10 3.34 No 0.86

Mira Loma Mira Loma 06-065-

8005 3

Met-One BAM 

1020 w/VSCC

01/01/

2010

12/31/

2012

Winter = 246

Spring = 248

Summer = 252

Fall = 268

Total = 1014

1.07 5.01 No 0.91

*2010 and 2011 data have not been submitted to AQS 
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C-5

Period of Exclusion of Data from the PM2.5 Continuous FEMs

The above table details the period of available data by monitor on which the request to exclude 

PM2.5 continuous FEM data is based. Per EPA Regional Office approval, these data will be 

entered into EPA’s AQS database in a manner where the data are only used for the appropriate 

monitoring objective(s) (i.e., use data for just the AQI). Additionally, SCAQMD will continue to 

load any new data generated for the next 18 months (intended to represent the period until 

December 31 of 2014) in the same manner or until such time we request and receive approval 

from the EPA Regional Office to change the status of these monitors. 

PM2.5 Continuous FEM data for Reporting the AQI

While the analysis supports the request for the monitors above not be used for comparison to the 

NAAQS, the data are of sufficient comparability to collocated FRMs that they be used for public 

AQI reporting. Therefore, with EPA Regional Office approval we will report these data on our 

web site and to AIRNow (www.airnow.gov). As such, data submitted to EPA’s AQS database 

will be under “acceptable AQI” reporting (i.e., parameter code 88101) so that data users will 

know that these data are appropriate for use in AQI calculations, but not NAAQS comparison.

Assessments

The following one-page assessments are locations where our agency has collocated PM2.5 FRM 

and continuous FEM monitors. Each of these assessments is represented in the “Table –

Request for Exclusion of PM2.5 Continuous FEM Data” above.
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C-6

Anaheim 

(FRM POC: 1; FEM POC: 3)
Air Quality Monitoring Network Plan – July 2013

C-7

Burbank

(FRM POC: 1; FEM POC: 3)
Air Quality Monitoring Network Plan – July 2013

C-8

Central Los Angeles

(FRM POC: 1; FEM POC: 3)
Air Quality Monitoring Network Plan – July 2013

C-9

Central Los Angeles

(FRM POC: 1; FEM POC: 9)
Air Quality Monitoring Network Plan – July 2013

C-10

North Long Beach

(FRM POC: 1; FEM POC: 3)
Air Quality Monitoring Network Plan – July 2013

C-11

South Long Beach

(FRM POC: 1; FEM POC: 3)
Air Quality Monitoring Network Plan – July 2013

C-12

Rubidoux

(FRM POC: 1; FEM POC: 3)
Air Quality Monitoring Network Plan – July 2013

C-13

Rubidoux

(FRM POC: 1; FEM POC: 9)
Air Quality Monitoring Network Plan – July 2013

C-14

Mira Loma

(FRM POC: 1; FEM POC: 3)