Annual Monitoring 

Network Report 

for 

Twenty-three Districts in California 

July 2013 

ANNUAL MONITORING NETWORK REPORT 

FOR

TWENTY-THREE DISTRICTS IN CALIFORNIA 

California Air Resources Board 

July 2013 

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i Annual Monitoring Network Report for Twenty-three Districts in California

Table of Contents 

Section 1. Introduction............................................................................. 1 

Section 2. Monitoring network overview.................................................... 6 

Section 3. Site and monitoring information........................................... 7 

Section 4. Additional information about the monitors............................. 18 

Section 5. Federal minimum monitoring requirements............................. 26 

Section 6. Federal monitoring requirements at State-level or by PQAO or 

 Area............................................................................................. 33 

 6.1 Collocation requirements................................................... 34 

Section 7. Federal air quality assurance........................................... 38 

Section 8. Operating schedules.......................................................... 42 

Section 9. Additional information on PM2.5 monitors............................. 45 

9.1 Suitability for comparison to the annual PM2.5 NAAQS........... 45 

9.2 Review of changes to PM2.5 network.................................. 45 

Section 10. Proposed and recently implemented monitoring site changes.. 47 

Section 11. Access to more information about the network................... 51 

Appendix A. Regulatory language of 40 CFR 58.10.............................. 55 

Appendix B. Minimum monitoring requirements for O3, PM2.5 and PM10.... 59 

Appendix C. Supporting documents included in the network plan............... 63 

Appendix D. Acronymns............................................................................... 76 
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ii Annual Monitoring Network Report for Twenty-three Districts in California

List of Tables 

Table 1. Districts Included in the ARB PQAO......................................... 3 

Table 2. Location of Information Required for Annual Network Plan......... 5 

Table 3. Site and Monitoring Information............................................... 11 

Table 4. Additional Information About the Monitors.................................. 19 

Table 5. Numbers of Required and Existing Sites by Core-based 

 Statistical Area (CBSA)......................................................... 27 

Table 5a. Core-Based Statistical Areas in California.................................... 28 

Table 6. Near-road NO2 Monitoring Requirements in California.................. 30 

Table 7. Minimum Monitoring Requirements for SO2............................ 31 

Table 8. NCore Monitoring in California....................................................... 33 

Table 9. Collocation Requirements for PM2.5 FRM................................ 34 

Table 10. Collocation Requirements for continuous PM2.5 FEM............... 35 

Table 11. 2012 Audit Date Information for the Monitors in this Plan............. 40 

Table 12. Current PM2.5 FRM Operating Schedules............................ 43 

Table 13. ARB Proposed and Implemented Network Changes................. 48 

List of Figures 

Figure 1. The ARB PQAO..................................................................... 4 
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1 Annual Monitoring Network Report for Twenty-three Districts in California

Section 1. Introduction 

Federal regulations require State and local agencies that conduct ambient air 

monitoring for regulatory purposes to submit an Annual Monitoring Network 

Report, beginning in 2007. The report must contain specific monitoring network 

information and be available for a 30-day public inspection period prior to 

submittal to the U.S. Environmental Protection Agency (U.S. EPA). This report 

meets the requirements specified in Title 40, Code of Federal Regulations, 

Part 58.10 (40 CFR 58.10) for a subset of the California monitoring network. 

This report covers the monitoring network for 23 of the 32 air districts within the 

Air Resources Board (ARB) Primary Quality Assurance Organization (PQAO). A 

PQAO is the umbrella under which monitoring agencies are organized to ensure 

that monitoring is conducted according to a common set of procedures, using 

common calibration facilities and standards, and that oversight is conducted by 

one air quality organization. Most of the districts in California are included in the 

ARB PQAO. The exceptions are the South Coast, San Diego, and Bay Area 

districts, which each comprise their own PQAO. Each PQAO is responsible for 

their monitoring network and reports directly to U.S. EPA on monitoring network 

requirements. 

Table 1 lists the districts in the ARB PQAO that are included within the scope of 

this report, as well as those districts that are preparing their own report. This 

report covers documentation of the monitoring network for the period of 

January 1 through December 31, 2012, along with a discussion of proposed 

changes to the network. Consistent with direction from the U.S. EPA, this report 

includes monitors operated by the local districts, ARB, and other agencies within 

the jurisdiction of the region included in this report. This includes monitors 

designated as State and Local Air Monitoring Sites (SLAMS), National Core 

(NCore) multi-pollutant monitoring stations, Special Purpose Monitoring (SPM), 

and other types of monitors operated by ARB, air districts, and National Park 

Service (NPS). This report also includes the Federal Reference Method (FRM) 

monitors and Federal Equivalent Method (FEM) monitors. 

This report documents that the area covered by this report complies with federal 

monitoring requirements, which are specified in 40 CFR 58, Appendices A 

through E. Table 2 identifies the elements from 40 CFR 58 that are required to 

be included in the annual report. The requirements are comprehensive and 

include information on items such as minimum monitoring requirements, monitor 

operation, monitor siting, sampling schedule, and quality assurance activities. 
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2 Annual Monitoring Network Report for Twenty-three Districts in California

Overview of Report 

Table 1 and Figure 1 identify the 23 air districts within the ARB PQAO covered in 

this report as well as the 9 districts in the ARB PQAO that are preparing their own 

report. A brief summary of elements included in this report is listed below. 

 Summary of CFR elements required for inclusion in the report 

 Detailed information on each monitor 

 Minimum monitoring requirements and compliance with these 

requirements 

 PM collocation requirements 

 PM2.5 FRM operating schedules 

 Proposed and implemented network changes 

In compiling this report, ARB solicited input from and review by the local air 

districts whose jurisdictions are included. Also, the report was available for a 

30 day public inspection period prior to its submittal to the U.S. EPA. This report 

can be downloaded from the internet at www.arb.ca.gov/aqd/amnr/amnr.htm. 
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3 Annual Monitoring Network Report for Twenty-three Districts in California

Table 1 

Districts Included in the ARB Primary Quality Assurance Organization (PQAO) 

Air districts that are Air districts drafting 

included in this ARB report their own Annual Network Plans 

 Amador County APCD Great Basin Unified APCD 

 Antelope Valley APCD Imperial County APCD 

 Butte County AQMD Monterey Bay Unified APCD 

 Calaveras County APCD North Coast Unified AQMD 

 Colusa County APCD Sacramento Metropolitan AQMD 

 Eastern Kern APCD San Joaquin Valley APCD 

 El Dorado County AQMD San Luis Obispo County APCD 

 Feather River AQMD Santa Barbara County APCD 

 Glenn County APCD Ventura County APCD 

 Lake County AQMD 

 Lassen County APCD 

 Mariposa County APCD 

 Mendocino County AQMD 

 Modoc County APCD 

 Mojave Desert AQMD 

 Northern Sierra AQMD 

 Northern Sonoma County APCD 

 Placer County APCD 

 Shasta County AQMD 

 Siskiyou County APCD 

 Tehama County APCD 

 Tuolumne County APCD 

 Yolo-Solano AQMD 

Notes: 

APCD stands for Air Pollution Control District. 

AQMD stands for Air Quality Management District. 

The South Coast, San Diego and Bay Area districts are not included in this table. 

These three districts are drafting their own network plan because they are 

designated PQAOs. 
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4 Annual Monitoring Network Report for Twenty-three Districts in California

Figure 1 

The ARB PQAO 
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5 Annual Monitoring Network Report for Twenty-three Districts in California

Table 2 

Location of Information Required for Annual Network Plan 

Elements required by 40 CFR 58.10 Location in Annual Network Plan 

Monitoring purpose information Section 3 

Evidence that siting and operation 

criteria are met: 

 40 CFR 58, Appendix A Section 6 & 7 

 40 CFR 58, Appendix B Section 7 

 40 CFR 58, Appendix D Section 5 & 6 

 40 CFR 58, Appendix E Section 7 

Air Quality System Site Identification 

Number (AQS Site ID) Section 3, Table 3 

Section 4, Table 4 

Location of sites 

 Street address Section 3, Table 3 

 Geographic coordinates Section 4, Table 4 

Sampling and analysis methods of 

monitors Section 4, Table 4 

Operating schedules for monitors Section 8 

Proposals to move/remove stations Section 10 

Monitoring objectives and spatial scale Sections 3 & 4, Tables 3 & 4 

Sites suitable or not for comparison to 

the annual PM2.5 National Ambient Air Section 9.1 

Quality Standard 

Core-Based statistical area information Section 3, Tables 3 

(MSA and micropolitan) Section 4, Table 4 

Section 5, Tables 5, 5a, 6 & 7 

 Appendix B 

Review of changes to PM2.5 Network Section 9.2 
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6 Annual Monitoring Network Report for Twenty-three Districts in California

Section 2. Monitoring Network Overview 

California’s ambient air monitoring network is one of the most extensive in the 

world, consisting of over 250 sites where air pollution levels are monitored and 

more than 700 monitors used to measure the pollutant levels. A monitoring 

network this large is needed to cover the diverse range of topography, 

meteorology, emissions, and air quality in California, while adequately 

representing a large population. The monitoring network is critical in assessing 

the State’s clean air progress and in determining pollutant exposures in 

California. 

The network of monitoring sites for a pollutant tends to be denser where the air 

quality problem is worse and where the population is greater. The monitoring 

network also strives to provide representative data to all the broad geographical 

areas in California, including the coastal areas, the interior valleys, the desert 

regions, and the mountainous areas. Monitoring is also conducted in Mexico, 

across the border from San Diego and Imperial counties. Monitors are operated 

by ARB, some by local air districts, and a few by other entities including the 

National Park Service, private contractors, and tribal authorities. Note that tribal 

monitors are not included in this report. 

Ambient concentration data are collected for a wide variety of pollutants. The 

most prevalent of these are ozone (O3), particulate matter with a diameter of 

2.5 microns or less (PM2.5), particulate matter with a diameter of 10 microns or 

less (PM10), and a number of toxic compounds. While toxics monitoring plays an 

integral part in air monitoring programs, this report only covers those pollutants 

specified by federal requirements to be included in the annual monitoring network 

plans. Monitoring for meteorological parameters is also conducted at a number 

of sites. The data is needed to better understand and inform the public about the 

nature of the ambient air quality problems in California. 

Not all pollutants are monitored at all sites. Most sites monitor for multiple 

pollutants; other sites monitor for only one or two. The State and local air quality 

agencies in California make the effort to only collect data that is needed from 

each site. The needs for the monitoring data are varied. A sense of this can be 

gathered from the information on monitoring objectives and purposes in the next 

section of this report. A fundamental purpose of monitoring is to distinguish 

between areas where pollutant levels violate the ambient air quality standards 

and areas where they do not. Health-based ambient air quality standards are set 

at levels of pollutant concentrations that result in adverse impacts to human 

health. Evidence of a standard being violated in an area leads to efforts to 

reduce the sources of pollution that result in the exceedances. In other words, 

air quality agencies develop strategies and regulations to achieve needed 

emission reductions. Data from the ambient monitoring network are then used to 

indicate the success of this, in terms of the rate of progress towards attaining the 

standards or to show that standards have been attained. 
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7 Annual Monitoring Network Report for Twenty-three Districts in California

Section 3. Site and Monitoring Information

This section details monitoring information for the sites and monitors that fall 

within the geographical scope of this report. U.S. EPA requires three types of 

information to be included in the annual network plans. These are: federal site 

type, federal monitoring objective, and federal monitor type. The first three 

subsections, below, describe these federal monitoring requirements. The fourth 

subsection provides detail on state and local monitoring purposes, which 

encompass a broader scope of active program areas than the federal monitoring 

requirements. 

Federal Site type 

Monitoring sites must be capable of informing air quality program managers 

about many things including the peak air pollution levels, typical levels in 

populated areas, air pollution transported into and outside of a city or region, air 

pollution levels near specific sources and so on. For these reasons, U.S. EPA 

requires that each monitor at a site be designated, at a minimum, with one of the 

twelve site types that are established in the AQS database. The site type is 

monitor dependent. The twelve site types are: 

Extreme Downwind Max Ozone Concentration 

Highest Concentration Max Precursor Emissions Impacts 

Population Exposure Source Oriented 

Upwind Background Welfare Related Impacts 

Regional Transport General 

Quality Assurance Other 

While most of the site types are specific to a monitoring purpose, for example 

population exposure, two site types are general in nature and could be used for 

broad purposes (i.e., General and Other). U.S. EPA requires that a monitor be 

properly designated with an appropriate site type so that the data collected by the 

monitor at a site can be used to support the three basic federal monitoring 

objectives, which are discussed in more detail below. The site type of the 

monitors covered in this report is included in Table 3. 

Federal Monitoring Objective 

An ambient air monitoring network must be designed to meet three basic federal 

monitoring objectives, which are: 

1) to provide air quality data to the public in a timely manner, 

2) to support compliance with national air quality standards and 

3) to support air quality research studies. 
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8 Annual Monitoring Network Report for Twenty-three Districts in California

For the purpose of this report, the monitoring objectives are the federal 

monitoring objectives defined in Appendix D of 40 CFR 58. Federal monitoring 

regulations required that each monitor measuring criteria pollutants have at least 

one monitoring objective. However, many air quality agencies operate monitors 

with multiple objectives in mind. For example, monitoring is conducted to provide 

both air quality data to the public as well as to support air quality standards. The 

federal monitoring objective of the monitors covered in this report is included in 

Table 3. 

Federal Monitor Type 

U.S. EPA requires that every state establish a network of air monitoring stations 

for criteria pollutants, using criteria set in the CFR for the monitoring stations’ 

location and operation. The monitoring stations in this network are called the 

State and Local Air Monitoring Stations (SLAMS). In addition, U.S. EPA requires 

state and local monitoring agencies to establish monitoring stations to measure 

approximately 60 volatile hydrocarbons and carbonyls, which plays an integral 

role in ozone studies. These stations are called the Photochemical Assessment 

Monitoring Stations (PAMS). A third type of monitor, the Special Purpose Monitor 

(SPM), is used by state and local monitoring agencies to fulfill very specific or 

short-term monitoring goals. While there are a total of fifteen monitor types 

established by U.S. EPA, SLAMS, PAMS, and SPM are the three most common 

monitor types used by state and local monitoring agencies in California. Table 3 

lists the monitor type of each monitor that is covered in this report. The majority 

of the monitors included in this report are part of the SLAMS network in 

California. The completed list of monitor types is listed at the end of Table 3. 

State and Local Monitoring Purposes 

There are a number of monitoring purposes besides the federal classifications. 

These are directly related to the needs of state and local agencies. California 

has a very comprehensive monitoring network that is needed for implementing a 

variety of programs. Listed below are some of the most common state and local 

monitoring purposes: 

 Agricultural Burning refers to the intentional use of fire for vegetation 

management, both in agricultural settings, such as fields and orchards, as 

well as in wildlands, including rangeland and forests, to improve land for 

wildlife and game habitat or as a tool for disease or pest prevention. 

Monitors with this purpose are used to assess when and where burning 

can occur. 

 Expected High Concentration monitoring is used to measure pollutant 

concentrations in areas where air pollution is expected to be at its highest. 

The State designation criteria contain the requirement for this type of 

monitoring in order to show that an area attains the State air quality 
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9 Annual Monitoring Network Report for Twenty-three Districts in California

standards. During the State area designation process, the data from all 

monitors in an area are examined, but only the data from the monitors with 

the highest concentrations will determine the designation of the area. 

 The Geyser Air Monitoring Program (GAMP) was established to monitor 

ambient air quality in geothermal areas, mainly monitoring for hydrogen 

sulfide. 

 Residential Burning or backyard burning is the open burning of yard 

wastes by household residents. Backyard burning includes dry weeds, 

plant pruning, shrubbery, tree trimmings, and branches. Data from 

monitors with this purpose help guide decisions regarding appropriate 

times to allow residential burning. 

 Representative Concentration means locating a site to represent a 

geographical region with common topography and meteorology. These 

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

a particular pollutant. This is a purpose listed by the U.S. EPA. 

 State Area Designation monitoring is used to determine compliance with 

the State ambient air quality standards for a particular pollutant. Using the 

monitors with the highest concentrations of a particular pollutant, the ARB 

determines if the area is in attainment or non-attainment of the State air 

quality standards, as already described in the discussion of Expected High 

Concentration Monitoring. 

 State Implementation Plan (SIP) and/or Maintenance Plan Requirement is 

monitoring conducted to demonstrate compliance with SIP requirements. 

The SIP is a plan prepared by states and submitted to the U.S. EPA 

describing how each area will attain and maintain federal air quality 

standards. Once an area attains a standard, the area is required to show 

and maintain that status, which requires continued monitoring in the area. 

 Trend Analysis monitoring is useful for comparing and analyzing air 

pollution concentrations over time and distance. Usually, trend analyses 

show the progress or lack of progress in improving air quality for an area 

over a period of years. Some sites are more useful than others for trend 

analyses. For example, it is better to have a history of monitoring at a site 

that includes the full time period of a trend analysis. 

This is not a comprehensive list of all state and local monitoring purposes, but 

only includes the most common purposes used for monitoring by air quality 

agencies in California. Note that while the terms “objective” and “purpose” are 

almost analogous to one another and could be used interchangeably, to avoid 

confusion, this report separates the monitoring objectives from the monitoring 

purposes by limiting the monitoring objectives to the three federal objectives as 

defined above and the monitoring purposes to the state and local monitoring 
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10 Annual Monitoring Network Report for Twenty-three Districts in California

purposes. The state and local monitoring purposes are more comprehensive 

than the federal monitoring objectives. The state and local monitoring purpose of 

the monitors covered in this report is included in Table 3. 

Summary of Table 3 

Table 3 lists the federal site type, federal monitoring objective, federal monitor 

type, and state and local monitoring purposes of each monitor covered in this 

report. In addition, Table 3 lists other site and monitoring information, such as the 

Air Quality System (AQS) Site ID, site address, site name, pollutants monitored, 

and parameter codes. Note that the term “site type” refers to the individual 

monitor(s) at a site and not the site itself. U.S. EPA has determined that a single 

site type may not describe all of the monitors at a particular site; therefore, 

U.S. EPA established the site type designations at the monitor level, rather than 

the site level. Also note that a monitor can have multiple site type, monitoring 

objective, monitor type, or monitoring purpose designations. 

Finally, Table 3 also lists the location of each monitor, including the Core-Based 

Statistical Area (CBSA) in which the monitor is located. CBSAs are defined by 

the United States Office of Management and Budget (OMB) and provide a 

consistent set of geographical areas for Federal agencies to use in collecting, 

tabulating, and publishing statistical data. Two types of areas are included as 

CBSAs: Metropolitan Statistical Areas and Micropolitan Statistical Areas. The 

difference between a Metropolitan and Micropolitan statistical area is the level of 

population. A Metropolitan Statistical Area has an urban core with a population of 

50,000 or more, whereas a Micropolitan Statistical Area has an urban core with a 

population of at least 10,000, but less than 50,000. Both Metropolitan and 

Micropolitan statistical areas comprise one or more counties. 

U.S. EPA specifies the number of monitors required for each pollutant based on 

the OMB statistical areas. Older standards, such as the federal ozone standard, 

specify required monitors based on Metropolitan Statistical Area and Micropolitan 

Statistical Area. More recent standards, such as the federal SO2 standard, use 

the newer collective term, CBSA. Because it is more current, the term CBSA is 

used in this report, as well. A comprehensive CBSA list for California is provided 

in Table 5a in Section 5 of this report. Also in Table 5a is information about 

CBSAs that are not covered in this plan, but are covered either in part or in 

whole, in other individual district plans. 
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11 Annual Monitoring Network Report for Twenty-three Districts in California

Table 3 

Site and Monitoring Information 

(Monitors reporting data in 2012) 

OZONE CO NO2 SO2 PM2.5* PM10*

Station/Address/AQS Site # 44201 42101 42602 42401 88101/88501 81102

LAKE COUNTY AIR BASIN

Lake County / CBSA: Clearlake Micropolitan Statistical Area

Middletown-Anderson Springs Road Site Type: Gnrl

11270 Anderson Springs Road, Middletown Monitoring Obj.: RSupport

060333010 Monitoring Purp.: StateD, GAMP

Monitor Type: SLAMS

Glenbrook-High Valley Road Site Type: Gnrl

8276 High Valley Road, Cobb Monitoring Obj.: RSupport

060333011 Monitoring Purp.: StateD, GAMP

Monitor Type: SLAMS

Lakeport-Lakeport Blvd Site Type: Gnrl Gnrl Gnrl

905 Lakeport Blvd, Lakeport Monitoring Obj.: NAAQS NAAQS NAAQS

060333001 Monitoring Purp.: StateD StateD StateD

Monitor Type: SLAMS SLAMS SLAMS

LAKE TAHOE AIR BASIN

El Dorado County / CBSA: Sacramento-Arden-Arcade-Roseville Metropolitan Statistical Area

South Lake Tahoe-Sandy Way Site Type: (PopEx)

3337 Sandy Way, South Lake Tahoe Monitoring Obj.: (PublicR)

060170011 Monitoring Purp.: (RConc)

Monitor Type: (SLAMS)

MOJAVE DESERT AIR BASIN

Kern County / CBSA: Bakersfield Metropolitan Statistical Area

Canebrake-3147 Highway 178 Site Type: PopEx

3147 Highway 178, Canebrake Monitoring Obj.: NAAQS

060290017 Monitoring Purp.: RConc

Monitor Type: SLAMS

Mojave-923 Poole Street Site Type: HConc (PopEx) (PopEx)

923 Poole Street, Mojave Monitoring Obj.: NAAQS (NAAQS) (NAAQS)

060290011 Monitoring Purp.: SIPMain, Trans (StateD) (StateD)

Monitor Type: SLAMS (SLAMS) (SLAMS)

Ridgecrest-100 West California Avenue Site Type: PopEx PopEx

100 West California Avenue, Ridgecrest Monitoring Obj.: NAAQS NAAQS

060290015 Monitoring Purp.: StateD, RConc SIPMain, StateD

Monitor Type: SLAMS SLAMS

Los Angeles County / CBSA: Los Angeles-Long Beach-Anahiem Metropolitan Statistical Area

Lancaster-43301 Division Street Site Type: Trans Gnrl Gnrl Gnrl Gnrl:(Gnrl)

43301 Division Street, Lancaster Monitoring Obj.: NAAQS NAAQS NAAQS NAAQS NAAQS:(PublicR)

060379033 Monitoring Purp.: Trnds RConc RConc RConc Rconc:(RConc)

Monitor Type: SLAMS SLAMS SLAMS SLAMS SLAMS:(SLAMS)

Riverside County / CBSA: Riverside-San Bernardino-Ontario Metropolitan Statistical Area

Blythe-445 W Murphy Street Site Type: Gnrl

445 W Murphy Street, Blythe Monitoring Obj.: PublicR

060659003 Monitoring Purp.: RConc

Monitor Type: SLAMS

San Bernardino County / CBSA: Riverside-San Bernardino-Ontario Metropolitan Statistical Area

Barstow-200 E Buena Vista Road Site Type: Trans Gnrl Gnrl Gnrl

200 E Buena Vista Road, Barstow Monitoring Obj.: NAAQS NAAQS NAAQS NAAQS

060710001 Monitoring Purp.: StateD StateD StateD StateD

Monitor Type: SLAMS SLAMS SLAMS SLAMS

Hesperia-Olive Street Site Type: Trans Gnrl

17288 Olive Street, Hesperia Monitoring Obj.: NAAQS NAAQS

060714001 Monitoring Purp.: StateD StateD

Monitor Type: SLAMS SLAMS
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12 Annual Monitoring Network Report for Twenty-three Districts in California

Table 3 (cont.) 

Site and Monitoring Information 

(Monitors reporting data in 2012) 

OZONE CO NO2 SO2 PM2.5* PM10*

Station/Address/AQS Site # 44201 42101 42602 42401 88101/88501 81102

Joshua Tree National Monument Site Type: PopEx

060719002 Monitoring Obj.: PublicR

Monitoring Purp.: RConc

Monitor Type: SLAMS

Lucerne Valley-Middle School Site Type: Gnrl

8560 Aliento-Middle School, Lucerne Valley Monitoring Obj.: NAAQS

060710013 Monitoring Purp.: StateD

Monitor Type: SLAMS

Phelan-Beekley and Phelan Roads Site Type: Trans

Beekley Road and Phelan Road, Phelan Monitoring Obj.: NAAQS

060710012 Monitoring Purp.: StateD

Monitor Type: SLAMS

Trona-Athol and Telescope Site Type: Gnrl Gnrl Gnrl Gnrl:(HConc)

Corner of Athol and Telescope, Trona Monitoring Obj.: NAAQS NAAQS NAAQS NAAQS:(NAAQS)

060711234 Monitoring Purp.: StateD StateD StateD StateD:(StateD)

Monitor Type: SLAMS SLAMS SLAMS SLAMS:(SLAMS)

Victorville-14036 Park Avenue Site Type: Trans Gnrl Gnrl Gnrl Gnrl Gnrl:(PopEx)

14036 Park Avenue, Victorville Monitoring Obj.: NAAQS NAAQS NAAQS NAAQS NAAQS NAAQS:(NAAQS)

060710306 Monitoring Purp.: StateD StateD StateD StateD StateD StateD:(StateD)

Monitor Type: SLAMS SLAMS SLAMS SLAMS SLAMS SLAMS:(SLAMS)

MOUNTAIN COUNTIES AIR BASIN

Amador County / Not in a CBSA

Jackson-201 Clinton Road Site Type: Gnrl/Trans

201 Clinton Road, Jackson Monitoring Obj.: NAAQS

060050002 Monitoring Purp.: StateD/SIPMain

Monitor Type: SLAMS

Calaveras County / Not in a CBSA

San Andreas-501 Gold Strike Road Site Type: Gnrl/Trans (Gnrl) Gnrl

501 Gold Strike Road, San Andreas Monitoring Obj.: NAAQS (PublicR) NAAQS

060090001 Monitoring Purp.: StateD/SIPMain (RConc) StateD

Monitor Type: SLAMS (SPM) SLAMS

El Dorado County / CBSA: Sacramento-Arden-Arcade-Roseville Metropolitan Statistical Area

Cool-Highway 193 Site Type: HConc

1400 American River Trail, Cool Monitoring Obj.: NAAQS

060170020 Monitoring Purp.: SIPMain

Monitor Type: SLAMS

Echo Summit Site Type: Trans

21200 Highway 50-Little Norway Monitoring Obj.: NAAQS

060170012 Monitoring Purp.: StateD

Monitor Type: SLAMS

Placerville-Gold Nugget Way Site Type: HConc/Trans

3111 Gold Nugget Way, Placerville Monitoring Obj.: NAAQS

060170010 Monitoring Purp.: StateD

Monitor Type: SLAMS

Mariposa County / Not in a CBSA

Jerseydale-6440 Jerseydale Site Type: Trans

6440 Jerseydale Road, Jerseydale Monitoring Obj.: NAAQS

060430006 Monitoring Purp.: StateD

Monitor Type: SLAMS

Yosemite National Park-Turtleback Dome Site Type: HConc/Trans

060430003 Monitoring Obj.: NAAQS

Monitoring Purp.: StateD

Monitor Type: SLAMS

Yosemite Village-Visitor Center Site Type: (Gnrl) Gnrl

060431001 Monitoring Obj.: (PublicR) NAAQS

Monitoring Purp.: (RConc) StateD

Monitor Type: (SPM) SLAMS
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13 Annual Monitoring Network Report for Twenty-three Districts in California

Table 3 (cont.) 

Site and Monitoring Information 

(Monitors reporting data in 2012) 

OZONE CO NO2 SO2 PM2.5* PM10*

Station/Address/AQS Site # 44201 42101 42602 42401 88101/88501 81102

Nevada County / CBSA: Truckee-Grass Valley Micropolitan Statistical Area

Grass Valley-Litton Building Site Type: HConc/Trans HConc:(Gnrl)

200 Litton Drive, Grass Valley Monitoring Obj.: NAAQS NAAQS:(NAAQS)

060570005 Monitoring Purp.: StateD/Trnds StateD:(StateD)

Monitor Type: SLAMS SLAMS:(SLAMS)

Truckee-Fire Station Site Type: HConc:(Gnrl)

10049 Donner Pass Road, Truckee Monitoring Obj.: NAAQS:(NAAQS)

060571001 Monitoring Purp.: StateD:(StateD)

Monitor Type: SLAMS:(SLAMS)

White Cloud Mountain Site Type: Gnrl

26533 State Highway 20, White Cloud Mtn. Monitoring Obj.: NAAQS

060570007 Monitoring Purp.: StateD

Monitor Type: SLAMS

Placer County / CBSA: Sacramento-Arden-Arcade-Roseville Metropolitan Statistical Area

Colfax-City Hall Site Type: Gnrl (Gnrl) Gnrl

33 South Main Street, Colfax Monitoring Obj.: NAAQS (PublicR) NAAQS

060610004 Monitoring Purp.: StateD (StateD) StateD

Monitor Type: SLAMS (SLAMS) SLAMS

Plumas County / Not in a CBSA

Chester-222 1st Avenue Site Type: (Gnrl)

222 1st Avenue, Chester Monitoring Obj.: (NAAQS)

060631007 Monitoring Purp.: (StateD)

Monitor Type: (SLAMS)

Portola-161 Nevada Street Site Type: HConc:(Gnrl)

420 N Gulling Street, Portola Monitoring Obj.: NAAQS:(NAAQS)

060631009 Monitoring Purp.: StateD:(StateD)

Monitor Type: SLAMS:(SLAMS)

Quincy-N Church Street Site Type: HConc:(Gnrl)

267 North Church Street, Quincy Monitoring Obj.: NAAQS:(NAAQS)

060631006 Monitoring Purp.: StateD:(StateD)

Monitor Type: SLAMS:(SLAMS)

Tuolumne County / CBSA: Phoenix Lake-Cedar Ridge Micropolitan Statistical Area

Sonora-Barretta Street Site Type: Gnrl

251 South Barretta Street, Sonora Monitoring Obj.: NAAQS

061090005 Monitoring Purp.: StateD/SIPMain

Monitor Type: SLAMS

NORTH COAST AIR BASIN

Mendocino County / CBSA: Ukiah Micropolitan Statistical Area

Fort Bragg-Dana Street Site Type: (Gnrl)

300 Dana Street, Fort Bragg Monitoring Obj.: (NAAQS)

060450010 Monitoring Purp.: (RConc)

Monitor Type: (SLAMS)

Ukiah-County Library Site Type: (Gnrl)

105 North Main Street, Ukiah Monitoring Obj.: (NAAQS)

060450006 Monitoring Purp.: (RConc)

Monitor Type: (SLAMS)

Ukiah-East Gobbi Street Site Type: Trans

306 East Gobbi Street, Ukiah Monitoring Obj.: NAAQS

060450008 Monitoring Purp.: StateD

Monitor Type: SLAMS

Willits-125 East Commercial Street Site Type: (Gnrl)

125 East Commercial Street, Willits Monitoring Obj.: (NAAQS)

060452002 Monitoring Purp.: (RConc)

Monitor Type: (SLAMS)

Sonoma County / CBSA: Santa Rosa Metropolitan Statistical Area

Cloverdale-100 Washington Street Site Type: Gnrl

100 Washington Street, Colverdale Monitoring Obj.: NAAQS

060970001 Monitoring Purp.: AgBn, ResBn

Monitor Type: SLAMS
_______________________________________________________________________ 

14 Annual Monitoring Network Report for Twenty-three Districts in California

Table 3 (cont.) 

Site and Monitoring Information 

(Monitors reporting data in 2012) 

OZONE CO NO2 SO2 PM2.5* PM10*

Station/Address/AQS Site # 44201 42101 42602 42401 88101/88501 81102

Guerneville-Church and 1st Site Type: Gnrl

16255 1st Street, Guerneville Monitoring Obj.: NAAQS

060973002 Monitoring Purp.: AgBn, ResBn

Monitor Type: SLAMS

Healdsburg-133 Matheson Street Site Type: Gnrl

133 Matheson Street, Healdsburg Monitoring Obj.: NAAQS

060970002 Monitoring Purp.: AgBn, ResBn

Monitor Type: SLAMS

Healdsburg-Municipal Airport Site Type: Gnrl

200a Heidelberg Way, Healdsburg Monitoring Obj.: NAAQS

060971003 Monitoring Purp.: StateD

Monitor Type: SLAMS

NORTHEAST PLATEAU AIR BASIN

Siskiyou County / Not in a CBSA

Yreka-Foothill Drive Site Type: Gnrl/Trans Gnrl Gnrl

528 Foothill Drive, Yreka Monitoring Obj.: NAAQS NAAQS NAAQS

060932001 Monitoring Purp.: StateD StateD AgBn/StateD

Monitor Type: SLAMS SLAMS SLAMS

SACRAMENTO VALLEY AIR BASIN

Butte County / CBSA: Chico Metropolitan Statistical Area

Chico-East Site Type: Gnrl Gnrl Gnrl Gnrl:(Gnrl) Gnrl

984 East Avenue, Chico Monitoring Obj.: NAAQS NAAQS NAAQS NAAQS:(PublicR) NAAQS

060070008 Monitoring Purp.: StateD/AgBn StateD StateD StateD:(AgBn) StateD/AgBn

Monitor Type: SLAMS SLAMS SLAMS SLAMS:(SPM) SLAMS

Gridley-Cowee Avenue Site Type: (Gnrl)

608 Cowee Avenue, Gridley Monitoring Obj.: (PublicR)

060074001 Monitoring Purp.: (AgBn)

Monitor Type: (SPM)

Paradise-4405 Airport Road Site Type: Gnrl/HConc

4405 Airport Road, Paradise Monitoring Obj.: NAAQS

060070007 Monitoring Purp.: StateD/AgBn

Monitor Type: SLAMS

Paradise-6701 Clark Road Site Type: (Gnrl)

6701 Clark Road, Paradise Monitoring Obj.: (PublicR)

060072002 Monitoring Purp.: (AgBn)

Monitor Type: (SPM)

Colusa County/ Not in a CBSA 

Colusa-Sunrise Blvd Site Type: Gnrl Gnrl:(Gnrl) Gnrl

100 Sunrise Blvd, Colusa Monitoring Obj.: NAAQS NAAQS:(PublicR) NAAQS

060111002 Monitoring Purp.: StateD/AgBn StateD:(AgBn) StateD/AgBn

Monitor Type: SLAMS SLAMS:(SPM) SLAMS

Glenn County / Not in a CBSA

Willows-E Laurel Street Site Type: Gnrl (Gnrl) Gnrl

720 N Colusa Street, Willows Monitoring Obj.: NAAQS (PublicR) NAAQS

060210003 Monitoring Purp.: StateD/AgBn (AgBn) StateD/AgBn

Monitor Type: SLAMS (SPM) SLAMS

Placer County / CBSA: Sacramento-Arden-Arcade-Roseville Metropolitan Statistical Area

Auburn-Atwood Site Type: Gnrl (Gnrl)

11645 Atwood Road, Auburn Monitoring Obj.: NAAQS (NAAQS)

060610003 Monitoring Purp.: StateD (StateD)

Monitor Type: SLAMS (SLAMS)

Auburn-B Avenue Site Type: Gnrl

11464 B Ave, Auburn Monitoring Obj.: NAAQS

060610002 Monitoring Purp.: StateD

Monitor Type: SLAMS

Lincoln-1st Street Site Type: Gnrl (Gnrl)

1445 1st Street, Lincoln Monitoring Obj.: NAAQS (NAAQS)

060612002 Monitoring Purp.: StateD (StateD)

Monitor Type: SLAMS (SLAMS)
_______________________________________________________________________ 

15 Annual Monitoring Network Report for Twenty-three Districts in California

Table 3 (cont.) 

Site and Monitoring Information 

(Monitors reporting data in 2012) 

OZONE CO NO2 SO2 PM2.5* PM10*

Station/Address/AQS Site # 44201 42101 42602 42401 88101/88501 81102

Roseville-N Sunrise Blvd Site Type: Gnrl Gnrl Gnrl:(Gnrl) Gnrl

151 N Sunrise Blvd, Roseville Monitoring Obj.: NAAQS NAAQS NAAQS:(PublicR) NAAQS

060610006 Monitoring Purp.: StateD/AgBn StateD StateD:(AgBn) StateD/AgBn

Monitor Type: SLAMS SLAMS SLAMS:(SPM) SLAMS

Shasta County / CBSA: Redding Metropolitan Statistical Area

Anderson-North Street Site Type: Gnrl Gnrl

2220 North Street, Anderson Monitoring Obj.: NAAQS NAAQS

060890007 Monitoring Purp.: StateD StateD

Monitor Type: SLAMS SLAMS

Lassen Volcanic Natl Park-Manzanita Lake Site Type: Gnrl

060893003 Monitoring Obj.: NAAQS

Monitoring Purp.: StateD

Monitor Type: SLAMS

Redding-Health Department Roof Site Type: Gnrl Gnrl Gnrl

2630 Hospital Lane, Redding Monitoring Obj.: NAAQS NAAQS NAAQS

060890004 Monitoring Purp.: StateD StateD StateD

Monitor Type: SLAMS SLAMS SLAMS

Shasta Lake-13791 Lake Blvd Site Type: Gnrl

13791 Lake Blvd, Shasta Lake Monitoring Obj.: NAAQS

060890009 Monitoring Purp.: StateD

Monitor Type: SLAMS

Shasta Lake-4066 La Mesa Avenue Site Type: Gnrl

4066 La Mesa Avenue, Shasta Lake Monitoring Obj.: NAAQS

060890008 Monitoring Purp.: StateD

Monitor Type: SLAMS

Solano County / CBSA: Vallejo-Fairfield Metropolitan Statistical Area

Vacaville-Merchant Street Site Type: Gnrl

650 Merchant Street, Vacaville Monitoring Obj.: NAAQS

060953001 Monitoring Purp.: StateD

Monitor Type: SLAMS

Vacaville-Ulatis Drive Site Type: Gnrl

2012 Ulatis Drive, Vacaville Monitoring Obj.: NAAQS

060953003 Monitoring Purp.: StateD

Monitor Type: SLAMS

Sutter County / CBSA: Yuba City Metropolitan Statistical Area

Sutter Buttes-S Buttes Site Type: HConc/Trans

061010004 Monitoring Obj.: NAAQS

Monitoring Purp.: AgBn

Monitor Type: SLAMS

Yuba City-Almond Street Site Type: Gnrl Gnrl Gnrl:(Gnrl) Gnrl

773 Almond Street, Yuba City Monitoring Obj.: NAAQS NAAQS NAAQS:(PublicR) NAAQS

061010003 Monitoring Purp.: StateD/AgBn StateD StateD:(AgBn) StateD

Monitor Type: SLAMS SLAMS SLAMS:(SPM) SLAMS

Tehama County / CBSA: Red Bluff Micropolitan Statistical Area

Red Bluff-Main Street Site Type: (Gnrl)

301 S Main Street, Red Bluff Monitoring Obj.: (NAAQS)

061030006 Monitoring Purp.: (RConc)

Monitor Type: (SLAMS)

Red Bluff-Oak Street Site Type: Gnrl

502 Oak Street, Red Bluff Monitoring Obj.: NAAQS

061030005 Monitoring Purp.: StateD

Monitor Type: SLAMS

Red Bluff-Messer Drive Site Type: Gnrl

700 Messer Drive, Red Bluff Monitoring Obj.: NAAQS

061030002 Monitoring Purp.: StateD

Monitor Type: SLAMS
_______________________________________________________________________ 

16 Annual Monitoring Network Report for Twenty-three Districts in California

Table 3 (cont.) 

Site and Monitoring Information 

(Monitors reporting data in 2012) 

OZONE CO NO2 SO2 PM2.5* PM10*

Station/Address/AQS Site # 44201 42101 42602 42401 88101/88501 81102

Tuscan Butte Site Type: Gnrl/Trans

061030004 Monitoring Obj.: NAAQS

Monitoring Purp.: StateD

Monitor Type: SLAMS

Yolo County / CBSA: Sacramento-Arden-Arcade-Roseville Metropolitan Statistical Area

Davis-UCD Campus Site Type: Gnrl Gnrl (Gnrl)

061130004 Monitoring Obj.: NAAQS NAAQS (PublicR)

Monitoring Purp.: StateD/AgBn StateD (AgBn)

Monitor Type: SLAMS SLAMS (SPM)

West Sacramento-15th Street Site Type: Gnrl

132 15th Street, West Sacramento Monitoring Obj.: NAAQS

061132001 Monitoring Purp.: StateD

Monitor Type: SLAMS

Woodland-Gibson Road Site Type: Gnrl Gnrl Gnrl

41929 E Gibson Road, Woodland Monitoring Obj.: NAAQS NAAQS NAAQS

061131003 Monitoring Purp.: StateD StateD StateD/AgBn

Monitor Type: SLAMS SLAMS SLAMS

Footnotes: 

This table only lists sites and monitors that have reported data in 2012. Lead monitors 

are not included in this list because there is no lead monitoring in the areas included in 

this report. 

After a county name, the table lists the U.S. Office of Management and Budget's 

Core-Based Statistical Area (CBSA) that includes the county. The term CBSA 

includes both Metropolitan Statistical Areas and Micropolitan Statistical Areas. A 

Metropolitan Statistical Area has at least one urban area with a population of 50,000 or 

more. A Micropolitan Statistical Area has at least one urban area with a population of 

10,000 to less than 50,000. 

*Site and monitoring information inside a parenthesis ( ) in a PM column denotes that 

a continuous PM monitor is located at the site. Site and monitoring information 

without a parenthesis reflects the filter-based PM monitor. For sites that have both 

continuous and filter-based PM monitors, the monitoring information are shown in the 

same column, separated by a colon (for example, SLAMS:(SPM)). Note that not all 

continuous PM2.5 monitors are Federal Equivalent Methods (FEMs). While some 

continuous PM2.5 monitors are non-FEMs, they are California Approved Samplers 

(CAS) and the data are used for State purposes. For example, the PM2.5 data (88501) 

from the BAM 1020, method code 731, are considered non-FEMs but these data are 

used in State designation calculations. Inversely, the continuous FEM PM2.5 data 

(88101) from the Met One BAM, method code 170, are considered FEMs but these 

data are not used in State calculations. The table lists both types of continuous PM2.5

monitors. PM2.5 FEM monitors are purposely BOLD and italicized to distinguish them 

from the non-FEM monitors. All continuous PM10 monitors are FEMs (i.e., TEOMs or 

BAMs). 
_______________________________________________________________________ 

17 Annual Monitoring Network Report for Twenty-three Districts in California

Codes used in Table 3 

ExDwn Extreme downwind

HConc Highest concentration

MaxO3 Max ozone concentration

MaxEm Max precursor emmissions impact

PopEx Population Exposure

Sourc Source oriented

UpWin Upwind background

Gnrl General/Background

Trans Regional transport

Welf Welfare related impacts

QA Quality Assurance

Other Other

Federal Monitoring Objectives

PublicR Provide air pollution data to public in a timely manner

NAAQS NAAQS comparison

RSupport Research support

EHConc Monitoring at expected high concentration sites relative to

 California Ambient Air Quality Standards

RConc Representative concentrations

AgBn Support agricultural/prescribed burn decisions

ResBn Support residential burn program

Trnds Trends analysis

StateD Support State area designation

SIPMain State Implementation Plan (SIP) maintance requirement

GAMP Geyser Air Monitoring Program

Monitor Types

Impr Improve

Indx Index site

Indus Industrial

NATTS NATTS

NonEPA Non-EPA federal

NonReg Non-regulatory

PAMS PAMS

NCore Proposed Ncore

QAcoll QA collocated

SLAMS SLAMS

SPM Special purpose

SupSP Supplemental speciation

TrnSP Trends speciation

Tribal Tribal monitors

UnPAMS Unofficial PAMS

Monitoring Purposes

Site Types
_______________________________________________________________________ 

18 Annual Monitoring Network Report for Twenty-three Districts in California

Section 4. Additional Information about the Monitors 

U.S. EPA regulations require that the annual network plan list specific additional 

information about the monitors that characterize the nature and location of the 

monitoring. Table 4 lists the spatial scales, sampling methods, method codes, 

parameter occurrence codes (POC) and start dates of the monitors that are 

included in this report. Also included in Table 4 are the geographical coordinates 

of the monitoring sites. Note that the continuous PM monitors are listed in 

parenthesis in the PM columns in Table 4. Moreover, continuous PM2.5 FEM 

monitors are purposely bold and italicized in the PM2.5 column to differentiate 

them from the continuous PM2.5 non-FEM monitors. At the end of Table 4, the 

codes used for the spatial scales, sampling methods, and method codes are 

defined. Also, a brief explanation of the POC is given. 

The regulations also require that the annual network plan list the laboratory 

analysis methods of the monitors. However, there is no separate analysis 

method for the gaseous monitors and continuous PM monitors. For the 

filter-based PM monitors, only simple mass weighing is done. Finally, the 

regulations require that the network plan include distance from road information, 

groundcover of the monitoring sites, probe heights of the monitoring instruments, 

materials used for monitoring, residence time, and distance from obstructions 

information. 

The monitoring information for groundcover, distance from road/obstruction, 

probe heights, monitoring instrument/material and residence time is not included 

at this time. Previous network plans included this information; however, 

U.S. EPA determined that some of the information was inadequate and needs to 

be updated. For this reason, U.S. EPA, ARB, districts, and a contractor are in the 

process of developing a statewide database to collect and store current site and 

monitoring information for all of the monitoring sites in California. Once this 

database is complete, which is anticipated to be available for use in 2014, this 

required site and monitoring information will be included in the ARB network plan. 

In the interim, older information can be viewed via ARB’s site surveys at: 

www.arb.ca.gov/qaweb/site.php. 
_______________________________________________________________________ 

19 Annual Monitoring Network Report for Twenty-three Districts in California

Table 4 

Additional Information about the Monitors 

(Monitors reporting data in 2012) 

OZONE CO NO2 SO2 PM2.5* PM10*

Station/Geographical Coordinates/AQS Site # 44201 42101 42602 42401 88101/88501 81102

LAKE COUNTY AIR BASIN

Lake County / CBSA: Clearlake Micropolitan Statistical Area

Middletown-Anderson Springs Road Spatial Scale: NGH

38.7744, -122.6994 Samp. Method: SCH, XG

060333010 Mthd. Code/POC: 098 / 1

Start Date: 1-1-2005

Glenbrook-High Valley Road Spatial Scale: NGH

38.8502, -122.7361 Samp. Method: SCH, XG

060333011 Mthd. Code/POC: 098 / 1

Start Date: 1-1-2005

Lakeport-Lakeport Blvd Spatial Scale: URB URB URB

39.0330, -122.9219 Samp. Method: UV SCH SCH

060333001 Mthd. Code/POC: 087 / 1 117 / 1 098 / 2

Start Date: 1-1-1980 1-1-1999 4-1-2001

LAKE TAHOE AIR BASIN

El Dorado County / CBSA: Sacramento-Arden-Arcade-Roseville Metropolitan Statistical Area

South Lake Tahoe-Sandy Way Spatial Scale: (NGH)

38.9450, -119.9703 Samp. Method: (BAM)

060170011 Mthd. Code/POC: (122 / 2)

Start Date: (6-1-2001)

MOJAVE DESERT AIR BASIN

Kern County / CBSA: Bakersfield Metropolitan Statistical Area

Canebrake-3147 Highway 178 Spatial Scale: REG

35.7277, -118.1393 Samp. Method: SI

060290017 Mthd. Code/POC: 141 / 1

Start Date: 1/1/2009

Mojave-923 Poole Street Spatial Scale: REG (NGH) (REG)

35.0503, -118.1478 Samp. Method: UV (BAM) (BAM)

060290011 Mthd. Code/POC: 087 / 1 (170 / 3) (122 / 3)

Start Date: 8-1-1993 (4-1-2011) (4-1-2011)

Ridgecrest-100 West California Avenue Spatial Scale: NGH NGH

35.6211, -117.6731 Samp. Method: SI SI 

060290015 Mthd. Code/POC: 118 / 1 063 / 1

Start Date: 6-1-1999 12-15-1999

Los Angeles County / CBSA: Los Angeles-Long Beach-Anahiem Metropolitan Statistical Area

Lancaster-43301 Division Street Spatial Scale: MID MID MID NGH NGH:(NGH)

34.6713, -118.1305 Samp. Method: UV IR CL SQ SI:(BAM)

060379033 Mthd. Code/POC: 087 / 1 093 / 1 099 / 1 117 / 1 063 / 1:(122 / 2)

Start Date: 11-1-2001 11-1-2001 11-1-2001 11-1-2001 11-1-01:(11-1-01)

Riverside County / CBSA: Riverside-San Bernardino-Ontario Metropolitan Statistical Area

Blythe-445 W Murphy Street Spatial Scale: NGH

33.6119, -114.6000 Samp. Method: UV

060659003 Mthd. Code/POC: 087 / 1

Start Date: 5-1-2003

San Bernardino County / CBSA: Riverside-San Bernardino-Ontario Metropolitan Statistical Area

Barstow-200 E Buena Vista Road Spatial Scale: NGH NGH NGH NGH

34.8938, -117.0244 Samp. Method: UV IR CL SI

060710001 Mthd. Code/POC: 087 / 1 093 / 1 099 / 1 063 / 2

Start Date: 1-1-1974 1-1-1973 1-1-1973 4-20-1988

Hesperia-Olive Street Spatial Scale: NGH NGH

34.4158, -117.2861 Samp. Method: UV SI

060714001 Mthd. Code/POC: 087 / 1 063 / 1

Start Date: 1-1-1980 1-1-1989
_______________________________________________________________________ 

20 Annual Monitoring Network Report for Twenty-three Districts in California

Table 4 (cont.) 

Additional Information about the Monitors 

(Monitors reporting data in 2012) 

OZONE CO NO2 SO2 PM2.5* PM10*

Station/Geographical Coordinates/AQS Site # 44201 42101 42602 42401 88101/88501 81102

Joshua Tree National Monument Spatial Scale: REG

34.0694, -116.3888 Samp. Method: UV

060719002 Mthd. Code/POC: 047 / 1

Start Date: 10/1/1993

Lucerne Valley-Middle School Spatial Scale: NGH

34.4103, -116.9067 Samp. Method: SI

060710013 Mthd. Code/POC: 063 / 1

Start Date: 6-1-1989

Phelan-Beekley and Phelan Roads Spatial Scale: NGH

34.4250, -117.5897 Samp. Method: UV

060710012 Mthd. Code/POC: 087 / 1

Start Date: 7-1-1987

Trona-Athol and Telescope Spatial Scale: REG NGH REG NGH:(NGH)

35.7744, -117.3722 Samp. Method: UV CL FL SI:(BAM)

060711234 Mthd. Code/POC: 087 / 1 099 / 1 077 / 1 063 / 1:(122/ 2)

Start Date: 4-1-1997 4-1-1997 4-1-1997 4/1/97:(6-1-97)

Victorville-14036 Park Avenue Spatial Scale: NGH NGH NGH NGH NGH NGH:(NGH)

34.5122, -117.3250 Samp. Method: UV IR CL FL SQ SI:(BAM)

060710306 Mthd. Code/POC: 087 / 1 093 / 1 099 / 1 077 / 1 117 / 1 063 / 1 (122 / 2)

Start Date: 1-1-2000 1-1-2000 1-1-2000 1/1/2000 1-1-2000 4-1-2000

MOUNTAIN COUNTIES AIR BASIN

Amador County / Not in a CBSA

Jackson-201 Clinton Road Spatial Scale: URB

38.3427, -120.7644 Samp. Method: UV

060050002 Mthd. Code/POC: 087 / 1

Start Date: 5-1-1992

Calaveras County / Not in a CBSA

San Andreas-501 Gold Strike Road Spatial Scale: REG (REG) REG

38.2019, -120.6802 Samp. Method: UV (BAM) SI

060090001 Mthd. Code/POC: 087 / 1 (170 / 3) 063 / 1

Start Date: 5-1-1994 (6-15-2010) 4-1-1994

El Dorado County / CBSA: Sacramento-Arden-Arcade-Roseville Metropolitan Statistical Area

Cool-Highway 193 Spatial Scale: REG

38.8906, -121.0000 Samp. Method: UV

060170020 Mthd. Code/POC: 087 / 1

Start Date: 6-1-1996

Echo Summit Spatial Scale: REG

38.8117, -120.0331 Samp. Method: UV

060170012 Mthd. Code/POC: 087 / 1

Start Date: 5-7-2006

Placerville-Gold Nugget Way Spatial Scale: REG

38.7247, -120.8219 Samp. Method: UV

060170010 Mthd. Code/POC: 087 / 1

Start Date: 2-1-1992

Mariposa County / Not in a CBSA

Jerseydale-6440 Jerseydale Spatial Scale: REG

37.5466, -119.8416 Samp. Method: UV

060430006 Mthd. Code/POC: 087 / 1

Start Date: 7-1-1995

Yosemite National Park-Turtleback Dome Spatial Scale: REG

37.7133, -119.7058 Samp. Method: UV

060430003 Mthd. Code/POC: 047 / 1

Start Date: 11-1-1988

Yosemite Village-Visitor Center Spatial Scale: (NGH) NGH

37.7486, -119.5869 Samp. Method: (BAM) SI

060431001 Mthd. Code/POC: (731 / 3) 063 / 2

Start Date: (2-2-2002) 1-28-1989
_______________________________________________________________________ 

21 Annual Monitoring Network Report for Twenty-three Districts in California

Table 4 (cont.) 

Additional Information about the Monitors 

(Monitors reporting data in 2012) 

OZONE CO NO2 SO2 PM2.5* PM10*

Station/Geographical Coordinates/AQS Site # 44201 42101 42602 42401 88101/88501 81102

Nevada County / CBSA: Truckee-Grass Valley Micropolitan Statistical Area

Grass Valley-Litton Building Spatial Scale: URB NGH:(NGH)

39.2336, -121.0555 Samp. Method: UV SCH:(BAM)

060570005 Mthd. Code/POC: 087 / 1 117 / 1: (731 / 3)

Start Date: 6-1-1993 12-30-98:(7-1-07)

Truckee-Fire Station Spatial Scale: NGH:(NGH)

39.3274, -120.1847 Samp. Method: SQ:(BAM)

060571001 Mthd. Code/POC: 118 / 1:(731 / 3)

Start Date: 3-31-99:(1-1-07)

White Cloud Mountain Spatial Scale: REG

39.3181, -120.8456 Samp. Method: UV

060570007 Mthd. Code/POC: 087 / 1

Start Date: 6-1-1995

Placer County / CBSA: Sacramento-Arden-Arcade-Roseville Metropolitan Statistical Area

Colfax-City Hall Spatial Scale: URB (NGH) NGH

39.0997, -120.9541 Samp. Method: UV (BAM) SI

060610004 Mthd. Code/POC: 087 / 1 (731 / 3) 063 / 1

Start Date: 1-1-1992 (1-1-2012) 1-1-2012

Plumas County / Not in a CBSA

Chester-222 1st Avenue Spatial Scale: (NGH)

40.3097, -121.2277 Samp. Method: (BAM)

060631007 Mthd. Code/POC: (731 / 3)

Start Date: (1-1-2007)

Portola-161 Nevada Street Spatial Scale: NGH:(NGH)

39.8083, -120.4717 Samp. Method: SCH:(BAM)

060631009 Mthd. Code/POC: 118 / 1:(731 / 3 )

Start Date: 1-18-07:(9-1-03)

Quincy-N Church Street Spatial Scale: NGH:(NGH)

39.9397, -120.9441 Samp. Method: SQ:(BAM)

060631006 Mthd. Code/POC: 118 / 1:(731 / 3)

Start Date: 3-26-99:(1-1-07)

Tuolumne County / CBSA: Phoenix Lake-Cedar Ridge Micropolitan Statistical Area

Sonora-Barretta Street Spatial Scale: NGH

37.9819, -120.3786 Samp. Method: UV

061090005 Mthd. Code/POC: 087 / 1

Start Date: 7-1-1992

NORTH COAST AIR BASIN

Mendocino County / CBSA: Ukiah Micropolitan Statistical Area

Fort Bragg-Dana Street Spatial Scale: (NGH)

39.4373, -123.7877 Samp. Method: (BAM)

060450010 Mthd. Code/POC: (122 / 1)

Start Date: (8-17-2011)

Ukiah-County Library Spatial Scale: (NGH)

39.1511, -123.2066 Samp. Method: (BAM)

060450006 Mthd. Code/POC: (170 / 3)

Start Date: (12-31-2008)

Ukiah-East Gobbi Street Spatial Scale: URB

39.1447, -123.2002 Samp. Method: UV

060450008 Mthd. Code/POC: 087 / 1

Start Date: 8-1-1992

Willits-125 East Commercial Street Spatial Scale: (NGH)

39.4118, -123.3528 Samp. Method: (BAM)

060452002 Mthd. Code/POC: (170 / 3)

Start Date: (9-15-2009)

Sonoma County / CBSA: Santa Rosa Metropolitan Statistical Area

Cloverdale-100 Washington Street Spatial Scale: NGH

38.8047, -123.0177 Samp. Method: SI

060970001 Mthd. Code/POC: 063 / 2

Start Date: 1-1-1990
_______________________________________________________________________ 

22 Annual Monitoring Network Report for Twenty-three Districts in California

Table 4 (cont.) 

Additional Information about the Monitors 

(Monitors reporting data in 2012) 

OZONE CO NO2 SO2 PM2.5* PM10*

Station/Geographical Coordinates/AQS Site # 44201 42101 42602 42401 88101/88501 81102

Guerneville-Church and 1st Spatial Scale: NGH

38.5016, -122.9977 Samp. Method: SI

060973002 Mthd. Code/POC: 063 / 1

Start Date: 4-1-1990

Healdsburg-133 Matheson Street Spatial Scale: NGH

38.6111, -122.8686 Samp. Method: SI

060970002 Mthd. Code/POC: 063 / 2

Start Date: 5-21-1988

Healdsburg-Municipal Airport Spatial Scale: URB

38.6536, -122.9005 Samp. Method: UV

060971003 Mthd. Code/POC: 087 / 1

Start Date: 6-1-1991

NORTHEAST PLATEAU AIR BASIN

Siskiyou County / Not in a CBSA

Yreka-Foothill Drive Spatial Scale: NGH NGH NGH

41.7267, -122.6336 Samp. Method: UV SQ SI

060932001 Mthd. Code/POC: 087 / 1 117 / 1 063 / 2

Start Date: 1-1-1981 8-21-2008 1-1-1988

SACRAMENTO VALLEY AIR BASIN

Butte County / CBSA: Chico Metropolitan Statistical Area

Chico-East Spatial Scale: URB NGH NGH NGH:(NGH) NGH

39.7616, -121.8405 Samp. Method: UV IR CL SCH:(BAM) SI

060070008 Mthd. Code/POC: 087 / 1 593 / 1 099 / 3 118 / 1:(731 / 3) 063 / 1

Start Date: 6-1-2012 6-1-2012 6-8-2012 4-27-12:(6-1-12) 5-27-2012

Gridley-Cowee Avenue Spatial Scale: (NGH)

39.3272, -121.6686 Samp. Method: (BAM)

060074001 Mthd. Code/POC: (731 / 3)

Start Date: (3-1-2001)

Paradise-4405 Airport Road Spatial Scale: REG

39.7141, -121.6177 Samp. Method: UV

060070007 Mthd. Code/POC: 087 / 1

Start Date: 5-1-2000

Paradise-6701 Clark Road Spatial Scale: (NGH)

39.7788, -121.5906 Samp. Method: (BAM)

060072002 Mthd. Code/POC: (731 / 3)

Start Date: (9-9-2010)

Colusa County / Not in a CBSA 

Colusa-Sunrise Blvd Spatial Scale: REG NGH:(NGH) REG

39.1888, -121.9980 Samp. Method: UV SQ:(BAM) SI

060111002 Mthd. Code/POC: 087 / 1 118 / 1:(731 / 3) 063 / 2

Start Date: 7-1-1996 12-16-98:(10-12-04) 5-1-1988

Glenn County / Not in a CBSA

Willows-E Laurel Street Spatial Scale: URB (NGH) REG

39.5172, -122.1897 Samp. Method: UV (BAM) SI

060210003 Mthd. Code/POC: 087 / 1 (731 / 3) 063 / 1

Start Date: 9-13-2006 (9-13-2006) 9-14-2006

Placer County / CBSA: Sacramento-Arden-Arcade-Roseville Metropolitan Statistical Area

Auburn-Atwood Spatial Scale: URB (NGH)

38.9356, -121.0995 Samp. Method: UV (BAM)

060610003 Mthd. Code/POC: 087 / 1 (170 / 1)

Start Date: 6-24-2011 (6-24-2011)

Auburn-B Avenue Spatial Scale: NGH

38.9394, -121.1055 Samp. Method: SI

060610002 Mthd. Code/POC: 063 / 1 

Start Date: 1-1-2012

Lincoln-1st Street Spatial Scale: URB (NGH)

38.8856, -121.3020 Samp. Method: UV (BAM)

060612002 Mthd. Code/POC: 087 / 1 (731 / 3)

Start Date: 12-21-2012 (12-21-2012)
_______________________________________________________________________ 

23 Annual Monitoring Network Report for Twenty-three Districts in California

Table 4 (cont.) 

Additional Information about the Monitors 

(Monitors reporting data in 2012) 

OZONE CO NO2 SO2 PM2.5* PM10*

Station/Geographical Coordinates/AQS Site # 44201 42101 42602 42401 88101/88501 81102

Roseville-N Sunrise Blvd Spatial Scale: URB NGH NGH:(NGH) URB

38.7461, -121.2647 Samp. Method: UV CL SCH:(BAM) SI

060610006 Mthd. Code/POC: 087 / 1 099 / 1 117 / 1:(731 / 3) 063 /1

Start Date: 1-13-1993 1-13-1993 12-31-98:(6-23-04) 1-13-1993

Shasta County / CBSA: Redding Metropolitan Statistical Area

Anderson-North Street Spatial Scale: NGH NGH

40.4531, -122.2986 Samp. Method: UV SI

060890007 Mthd. Code/POC: 087 / 1 063 / 1

Start Date: 5-1-1993 5-1-1993

Lassen Volcanic Natl Park-Manzanita Lake Spatial Scale: REG

40.5372, -121.5764 Samp. Method: UV

060893003 Mthd. Code/POC: 047 / 1

Start Date: 11-1-1987

Redding-Health Department Roof Spatial Scale: NGH NGH NGH

40.5514, -122.3808 Samp. Method: UV SCH SI

060890004 Mthd. Code/POC: 087 / 1 117 / 1 063 / 1

Start Date: 5-1-1990 12-19-1998 1-1-1988

Shasta Lake-13791 Lake Blvd Spatial Scale: NGH

40.6894, -122.4011 Samp. Method: UV

060890009 Mthd. Code/POC: 087 / 1

Start Date: 4-1-2009

Shasta Lake-4066 La Mesa Avenue Spatial Scale: REG

40.6775, -122.3733 Samp. Method: SI

060890008 Mthd. Code/POC: 063 / 1

Start Date: 1-1-2004

Solano County / CBSA: Vallejo-Fairfield Metropolitan Statistical Area

Vacaville-Merchant Street Spatial Scale: URB

38.3516, -121.9933 Samp. Method: SI

060953001 Mthd. Code/POC: 063 / 2

Start Date: 1-1-1988

Vacaville-Ulatis Drive Spatial Scale: URB

38.3583, -121.9500 Samp. Method: UV

060953003 Mthd. Code/POC: 087 / 1

Start Date: 7-21-2003

Sutter County / CBSA: Yuba City Metropolitan Statistical Area

Sutter Buttes-S Buttes Spatial Scale: REG

39.1583, -121.7500 Samp. Method: UV

061010004 Mthd. Code/POC: 087 / 1

Start Date: 5-1-1993

Yuba City-Almond Street Spatial Scale: URB NGH NGH:(NGH) NGH

39.1388, -121.6191 Samp. Method: UV CL SCH:(BAM) SI

061010003 Mthd. Code/POC: 087 / 1 099 / 1 118 / 1:(731 / 3) 063 / 1

Start Date: 10-1-1989 10-1-1989 12-19-98:(6-14-04) 12-1-1989

Tehama County / CBSA: Red Bluff Micropolitan Statistical Area

Red Bluff-Main Street Spatial Scale: (NGH)

40.1678, -122.2271 Samp. Method: (BAM)

061030006 Mthd. Code/POC: (170 / 3)

Start Date: (1-1-2009)

Red Bluff-Oak Street Spatial Scale: URB

40.1749, -122.2366 Samp. Method: UV

061030005 Mthd. Code/POC: 087 / 1

Start Date: 2-1-1996

Red Bluff-Messer Drive Spatial Scale: NGH

40.1638, -122.2213 Samp. Method: SI

061030002 Mthd. Code/POC: 063 / 2

Start Date: 1-1-1998
_______________________________________________________________________ 

24 Annual Monitoring Network Report for Twenty-three Districts in California

Table 4 (cont.) 

Additional Information about the Monitors 

(Monitors reporting data in 2012) 

OZONE CO NO2 SO2 PM2.5* PM10*

Station/Geographical Coordinates/AQS Site # 44201 42101 42602 42401 88101/88501 81102

Tuscan Butte Spatial Scale: REG

40.2622, -122.0928 Samp. Method: UV

061030004 Mthd. Code/POC: 087 / 1

Start Date: 6-1-1995

Yolo County / CBSA: Sacramento-Arden-Arcade-Roseville Metropolitan Statistical Area

Davis-UCD Campus Spatial Scale: URB NGH (NGH)

38.5352, -121.7730 Samp. Method: UV CL (BAM)

061130004 Mthd. Code/POC: 087 / 1 099 / 1 (731 / 3)

Start Date: 9-1-1987 5-21-1996 (8-14-2003)

West Sacramento-15th Street Spatial Scale: NGH

38.5713, -121.5258 Samp. Method: SI

061132001 Mthd. Code/POC: 063 / 1

Start Date: 9-1-1990

Woodland-Gibson Road Spatial Scale: URB NGH URB

38.6605, -121.7305 Samp. Method: UV SQ SI

061131003 Mthd. Code/POC: 087 / 1 118 / 1 063 / 1

Start Date: 5-27-1998 1-9-1999 10-26-1998

Footnotes: 

This table only lists sites and monitors that have reported data in 2012. Lead monitors 

are not included in this list because there is no lead monitoring in the areas included in 

this report. 

After a county name, the table lists the U.S. Office of Management and Budget's 

Core-Based Statistical Area (CBSA) that includes the county. The term CBSA 

includes both Metropolitan Statistical Areas and Micropolitan Statistical Areas. A 

Metropolitan Statistical Area has at least one urban area with a population of 50,000 or 

more. A Micropolitan Statistical Area has at least one urban area with a population of 

10,000 to less than 50,000. 

*Monitoring information inside a parenthesis ( ) in a PM column denotes that a 

continuous PM monitor is located at the site. Monitoring information without a 

parenthesis reflects the filter-based PM monitor. For sites that have both continuous 

and filter-based PM monitors, the monitoring information are shown in the same 

column, separated by a colon (for example, NGH:(NGH)). Note that not all continuous 

PM2.5 monitors are Federal Equivalent Methods (FEMs). While some continuous 

PM2.5 monitors are non-FEMs, they are California Approved Samplers (CAS) and the 

data are used for State purposes. For example, the PM2.5 data (88501) from the BAM 

1020, method code 731, are considered non-FEMs but these data are used in State 

designation calculations. Inversely, the continuous FEM PM2.5 data (88101) from the 

Met One BAM, method code 170, are considered FEMs but these data are not used in 

State calculations. The table lists both types of continuous PM2.5 monitors. PM2.5 FEM 

monitors are purposely BOLD and italicized to distinguish them from the non-FEM 

monitors. All continuous PM10monitors are FEMs (i.e., TEOMs or BAMs). 
_______________________________________________________________________ 

25 Annual Monitoring Network Report for Twenty-three Districts in California

Codes used in Table 4 

MIC Microscale

MID Middle Scale

NGH Neighborhood Scale

URB Urban Scale

REG Regional Scale

CL Chemiluminescent

FL Fluoresecence

IR Nondispersive infrared

SCH Low volume single channel sampler, size selective inlet

SI High volume sampler, size selective inlet

SQ Low volume sequential sampler, size selective inlet

UV Ultraviolet absorption

XG X-ray fluorescence

BAM Beta Attenuation Monitor

TEOM Tapered Element Oscillating Microbalance Monitor

Method codes

047 Thermo Electron/Thermo Environmental Instr., Inc. Model 49, 49C, & 49i Ozone analyzer

063 Anderson-General Metal Works Model 1200 High Volume sampler

077 Advance Pollution Instruments Model 100 SO2 analyzer

087 Teledyne -Advance Pollution Instuments Model 400 or T400 Ozone analyzer

093 Advance Pollution Instruments Model 300, GFC CO analyzer

098 Rupprecht & Patashnick Partisol Model 2000 Air Sampler

099 Advance Pollution Instruments Model 200A NO analyzer

117 Rupprecht & Patashnick Model 2000 PM2.5 Air Sampler

118 Rupprecht & Patashnick Plus Model 2025PM SEQ PM2.5 Air sampler

122 Met One BAM/GBAM Model 1020 Monitor

141 Tisch EnvironmentalModel TE-6070 PM10 High-Volume Sampler

170 Met One BAM Model 1020 Monitor PM2.5 VSCC FEM

593 Advance Pollution Instruments Model 300 EU, GFC CO analyzer

731 Met One BAM-1020 Monitor W/PM2.5 SCC

Sampling methods

Spatial scales

Note: POC stands for parameter occurrence code. This code is used to 

differentiate between the numbers of physical monitors at a site that measure for 

the same pollutant. For example, the PM10 monitors at a collocated PM10 site 

will use different POCs to differentiate between the primary and secondary PM10 

monitors.
_______________________________________________________________________ 

26 Annual Monitoring Network Report for Twenty-three Districts in California

Section 5. Federal Minimum Monitoring Requirements 

For most pollutants, U.S. EPA has established minimum monitoring requirements. 

These requirements are usually based on the CBSA along with considerations of 

population, emissions, or current air quality. Minimum monitoring requirements 

for ozone, PM2.5, PM10, NO2, SO2 and lead will be discussed in this section. In 

contrast, there are also monitoring requirements that apply to an entire Primary 

Quality Assurance Organization (PQAO) or State or are based on ozone 

nonattainment classification, which will be discussed in the next section. 

Federal Ozone, PM10, and PM2.5 Monitoring Requirements 

Requirements for the minimum numbers of monitors appear in Appendix D of 

Title 40, Part 58 of the CFR. For purposes of the minimum requirements, the 

areas are defined by the CBSAs developed by the OMB (more information on 

CBSAs appears on page 10). For ozone, PM2.5, continuous PM2.5 and PM10, the 

required minimum number is based on the population of an area and the severity 

of the air quality for the pollutant in the area. For the CBSAs included in this 

report, Table 5 summarizes the number of existing O3, PM2.5, continuous PM2.5 

and PM10 monitors and the number required by federal regulations. For a 

complete list of CBSAs in California, see Table 5a. Table 5a also lists information 

regarding CBSAs that are included in other district network plans. Note that this 

report only includes nine CBSAs, of which five CBSAs are partially covered in 

this report and parts are covered in the network reports being completed by other 

air districts. 

More detailed information on the ozone, PM2.5, continuous PM2.5 and PM10 

monitoring requirements and compliance with federal requirements can be found 

in Appendix B of this report. The tables in Appendix B list the CBSA, population 

of the CBSA and minimum monitoring requirement information. In addition, 

Appendix B also lists the monitoring sites for which are counted towards federal 

minimum monitoring requirements. The number of required monitors is based on 

the population of the CBSA, taken from the 2010 U.S. Census, in combination 

with the degree to which air quality in the CBSA is greater or less than the 

national air quality standards. In all cases, sufficient monitoring exists and no 

additional monitoring is required. 
_______________________________________________________________________ 

27 Annual Monitoring Network Report for Twenty-three Districts in California

Table 5 

Numbers of Required and Existing Sites by Core Based Statistical Area (CBSA) 

(CBSAs that include the twenty-three air districts included in this report) 

Core Based 

Statistical Area 

(CBSA) 

Pop. 

Ozone PM2.5 PM10 (SSI)3

Required Existing Required Existing Required Existing Required Existing 

SLAMS1 SLAMS SLAMS SLAMS Cont.2 Cont. SLAMS SLAMS 

Bakersfield* 839,361 2 8 2 4 1 3 1-2 4 

Chico 220,000 1 2 1 1 1 3 0 1 

Los Angeles-Long 

Beach-Anaheim* 12,828,837 4 19 3 12 2 7 2-4 11 

Redding 177,223 1 4 0 1 0 0 0 3 

Riverside-San 

BernardinoOntario* 

4,224,851 3 20 3 10 2 8 6-10 20 

SacramentoArden ArcadeRoseville* 

2,149,127 2 14 3 6 2 9 2-4 12 

Santa Rosa* 483,878 1 2 0 1 0 1 0-1 3 

Vallejo-Fairfield* 413,344 2 3 0 1 0 1 0-1 1 

Yuba City 166,892 1 1 0 1 0 1 0 1 

Notes: 

2010-2012 air quality data was used in determining the number of required sites. 

This table excludes tribal monitoring sites. 

Population is based on year 2010 Census data. 

*Parts of these CBSAs are included in the geographical scope of this report, and 

parts are within the geographical scope of reports being completed by the 

districts. The numbers of sites listed are for the entire CBSA. Table 5a shows 

the completed list of CBSAs in California. 

1

SLAMS stands for State and Local Air Monitoring Stations. 

2

Continuous refers to a continuous PM2.5 monitor, i.e., one that measures hourly 

data. For this assessment, both continuous FEM and non-FEM PM2.5 monitors 

were counted for each CBSA. 

3

SSI stands for size selective inlet. The SSI is an FRM for PM10. 
_______________________________________________________________________ 

28 Annual Monitoring Network Report for Twenty-three Districts in California

Table 5a 

Core-Based Statistical Areas in California 

 CBSA Name County(ies) Included in the 

ARB plan? 

CBSA also included in which 

district's plan? 

Bakersfield Kern Yes, partially San Joaquin Valley 

Chico Butte Yes -- 

El Centro Imperial No Imperial 

Fresno Fresno No San Joaquin Valley 

Hanford-Corcoran Kings No San Joaquin Valley 

Los Angeles-Long BeachAnaheim 

Los Angeles and Yes, partially South Coast 

Orange 

Madera Madera No San Joaquin Valley 

Merced Merced No San Joaquin Valley 

Modesto Stanislaus No San Joaquin Valley 

Napa Napa No Bay Area 

Oxnard-Thousand OaksVentura Ventura No Ventura County 

Redding Shasta Yes -- 

Riverside-San BernardinoOntario 

Riverside and Yes, partially South Coast 

San Bernardino 

Sacramento-RosevilleArden Arcade El Dorado, Placer, 

Sacramento, and 

Yolo 

Yes, partially Sacramento Metropolitan 

Salinas Monterey No Monterey Bay Unified 

San Diego-Carlsbad San Diego No San Diego County 

San Francisco-OaklandHayward 

Alameda, Contra 

Costa, Marin, San 

Francisco, and San 

Mateo 

No Bay Area 

San Jose-Sunnyvale-Santa 

Clara 

Santa Benito and 

Santa Clara 

No Bay Area 

San Luis Obispo-Paso 

Robles-Arroyo Grande 

San Luis Obispo No San Luis Obispo County 

Santa Cruz-Watsonville Santa Cruz No Monterey Bay Unified 

Santa Maria-Santa 

Barbara Santa Barbara No Santa Barbara County 

Santa Rosa Sonoma Yes, partially Bay Area 

Stockton-Lodi San Joaquin No San Joaquin Valley 

Vallejo-Fairfield Solano Yes, partially Bay Area 

Visalia-Porterville Tulare No San Joaquin Valley 

Yuba City Sutter and Yuba Yes -- 
_______________________________________________________________________ 

29 Annual Monitoring Network Report for Twenty-three Districts in California

Federal Near-Road, Area-Wide and Susceptible Population NO2 Monitoring 

Requirements 

There are new federal requirements for NO2 near roadway monitors that are 

applicable in California. However, none of the 23 districts covered in this report 

are required to deploy near roadway monitors. Near roadway monitors required 

for the Sacramento-Arden-Arcade-Roseville CBSA are being addressed by the 

Sacramento Metropolitan District. Near roadway monitors required for the 

Riverside-San Bernardino-Ontario and Los Angeles-Long Beach-Santa Ana 

CBSAs are being addressed by the South Coast District. Near roadway monitors 

required for the San Diego-Carlsbad-San Marcos CBSA are being addressed by 

the San Diego County District. Near roadway monitors required for the OxnardThousand Oaks-Ventura CBSA are being addressed by the Ventura County 

District. Near roadway monitors required for the San Francisco-OaklandFremont and San Jose-Sunnyvale-Santa Clara CBSAs are being addressed by 

the Bay Area District, and near roadway monitors required in the Bakersfield, 

Fresno, Modesto, and Stockton CBSAs are being addressed by the San Joaquin 

Valley District. All six of these districts are preparing separate network plans 

and/or separate documents related to the implementation of the NO2 near 

roadway requirements. Table 6 lists the districts responsible for planning and 

implementing near-road NO2 monitoring in California. 

In addition, federal monitoring regulations also require that there must be NO2

monitoring at a location of expected highest NO2 concentration representing the 

neighborhood or larger spatial scales within each CBSA with a population of 

1,000,000 or greater. There are three CBSAs included in this report that meet 

the population criteria: Los Angeles-Long Beach-Anaheim, Riverside-San 

Bernardino-Ontario, and Sacramento-Roseville-Arden Arcade CBSA. Area-wide 

NO2 monitoring in the Los Angeles-Long Beach-Anaheim and Riverside-San 

Bernardino-Ontario CBSAs is being addressed by the South Coast District. 

Area-wide NO2 monitoring in the Sacramento-Roseville-Arden Arcade CBSA is 

being addressed by the Sacramento Metropolitan District. There is no required 

NO2 area-wide monitoring for the remaining CBSAs included in this network plan. 

Finally, federal regulations also require that NO2 monitoring is conducted in 40 

locations throughout the United States in selected areas to protect susceptible 

and vulnerable populations. The locations of these areas are determined by 

each U.S. EPA Regional Administrator. In California, seven locations were 

selected to be part of the nationwide network, which includes San Diego, 

Oakland, Long Beach, Los Angeles, San Bernardino, Parlier, and Bakersfield. 

The selected monitoring locations are located in districts network plans. 
_______________________________________________________________________ 

30 Annual Monitoring Network Report for Twenty-three Districts in California

Table 6 

Near-Road NO2 Monitoring Requirements in California 

CBSA 

District 

Responsible 

for NO2 NearRoad 

Monitoring 

Number of 

Required NO2

Monitors 

Bakersfield San Joaquin 

Valley Unified 1 

Fresno San Joaquin 

Valley Unified 1 

Los Angeles-Long 

Beach-Santa Ana South Coast 2 

Modesto San Joaquin 

Valley Unified 1 

Oxnard-Thousand 

Oaks-Ventura 

Ventura 

County 1 

Riverside-San 

BernardinoOntario South Coast 2 

SacramentoArden-ArcadeRoseville 

Sacramento 

Metro 1 

San DiegoCarlsbad-San 

Marcos 

San Diego 2 

San FranciscoOakland-Fremont Bay Area 2 

San JoseSunnyvale-Santa 

Clara 

Bay Area 1 

Stockton San Joaquin 

Valley Unified 1 

Federal CO and SO2 Monitoring Requirements 

Monitoring for carbon monoxide (CO) is only required at a select number of NO2

near-road monitoring sites, beginning in the year 2015 (and continuing through 

2017) and will be addressed in future network plans by the implementing 

agencies. Regardless of the future implementation of the near-roadway CO and 

NO2 requirements, California has and continues to monitor for CO and NO2. 

On June 2, 2010, the U.S. EPA published the final rule for the revised federal 

SO2 standard which specifies the minimum number of sites at which state and 

local air agencies must deploy SO2 monitors. The monitoring regulations require 
_______________________________________________________________________ 

31 Annual Monitoring Network Report for Twenty-three Districts in California

SO2 monitors be placed in CBSAs based on a population weighted emissions 

index (PWEI) for the area. The PWEI of a CBSA is calculated by multiplying the 

latest available SO2 emission data within each CBSA by the population of the 

CBSA and then divided by one million. The final rule requires: 

 Three SO2 monitors in CBSAs with PWEI values of one million or more; 

 Two SO2 monitors in CBSAs with PWEI values less than one million 

but greater than 100,000; and 

 One SO2 monitor in CBSAs with PWEI values greater than 5,000 but 

less than 100,000. 

California has thirty-five CBSAs with population ranging from 17,000 to more 

than 12 million people. Table 7 lists the CBSAs in California that require SO2

monitoring. In addition, Table 7 shows that these CBSAs exceed federal 

monitoring requirements for SO2. California’s monitoring network currently 

consists of more SO2 monitors than the federal requirement. None of the areas 

included in this report are required to monitor for SO2. 

Table 7 

Minimum Monitoring Requirements for SO2

CBSA County(ies) Population 

(2010) 

SO2 

emission 

per CBSA 

(tpy) 

PWEI 

(Million 

personstpy) 

Number 

of 

Required 

Monitors 

Number 

of Active 

Monitors

Number of 

Additional 

Monitors 

Needed 

Los AngelesLong BeachSanta Ana 

Los Angeles 

and Orange 12,828,837 13,498 173,785 2 5 0 

Riverside-San 

BernardinoOntario 

Riverside and 

San 

Bernardino 

4,224,851 2,478 10,266 1 4 0 

San 

FranciscoOaklandFremont 

Alameda, 

Contra Costa, 

San 

Francisco, 

San Mateo, 

and Marin 

4,317,853 12,669 54,702 1 9 0 
_______________________________________________________________________ 

32 Annual Monitoring Network Report for Twenty-three Districts in California

Federal Lead Monitoring Requirements 

On December 14, 2010, U.S. EPA finalized the rule for the revised federal lead 

(Pb) standard, which also specifies the monitoring requirements for Pb. While 

the final rule maintains the airport monitoring threshold at 1.0 ton per year (tpy), 

the rule lowers the industrial source-oriented monitoring threshold from 1.0 tpy to 

0.5 tpy. In addition, the final rule replaces the population-based monitoring 

requirement with a requirement to monitor for Pb at urban NCore sites. 

The U.S. EPA selected 15 airports for a one-year study as part of the new Pb 

rule. Five airports are in California: Palo Alto Airport, McClellan-Palomar Airport, 

Reid-Hillview Airport, Gillespie Field Airport, and San Carlos Airport. None of 

these airports fall within the geographical scope of this report. With respect to 

source-oriented monitoring for Pb, the only stationary sources in California 

subject to the 0.5 tpy threshold are located in the South Coast Air Basin. The 

South Coast annual network plan provides a description of their source-oriented 

lead monitors. The areas covered in this network plan are not required to 

conduct source-oriented lead monitoring. 

Lastly, the final rule requires Pb monitoring at urban NCore sites. Urban NCore 

sites are those sites in a CBSA of 500,000 or more. Currently, there are six urban 

NCore sites in California, located in El Cajon, Fresno, Los Angeles, Riverside, 

Sacramento and San Jose. A seventh rural NCore site is located at White 

Mountain Research Station. None of these NCore sites are located in areas 

covered by this network plan. More information on NCore sites is provided in 

Section 6 of this report. 
_______________________________________________________________________ 

33 Annual Monitoring Network Report for Twenty-three Districts in California

Section 6. Federal Monitoring Requirements at State-level or by PQAO or 

Area 

Certain parts of 40 CFR 58 require that state and local agencies operate 

multi-pollutant monitoring sites, meet PM collocation requirements, as well as 

monitor at sites that are considered background, transport, or highest (maximum) 

concentration sites. The rest of this Section discusses these requirements. 

Federal NCore Monitoring Requirements for California 

On October 17, 2006, U.S. EPA issued amendments to the ambient air 

monitoring requirements for criteria pollutants. These amendments are codified 

in 40 CFR Parts 53 and 58. One of the most significant changes in the 

regulations was the requirement to establish a network of National Core (NCore) 

multi-pollutant monitoring stations. NCore sites include neighborhood and urban 

scale measurements in metropolitan areas and rural areas. Sites are long term 

and sited away from direct emission sources that could impact the ability to 

detect area-wide concentrations. These stations provide data on several 

pollutants at lower detection limits and replace the National Air Monitoring Station 

(NAMS) network that had existed for many years. 

Currently, in California, there are a total of seven monitoring sites that are part of 

the national NCore network. The seven NCore sites are listed in Table 8 along 

with the agency that operates the site. 

Table 8 

NCore Monitoring in California 

NCore Site Name NCore Type 

Agency 

Responsible for 

NCore 

Monitoring 

El Cajon Urban San Diego 

Fresno-Garland Urban ARB 

Los Angeles-North 

Main Urban South Coast 

Riverside-Rubidoux Urban South Coast 

Sacramento-Del 

Paso Manor Urban Sacramento Metro 

San Jose Urban Bay Area 

White Mountain 

Research Station Rural Great Basin Unified 
_______________________________________________________________________ 

34 Annual Monitoring Network Report for Twenty-three Districts in California

6.1 Federal Collocation Requirements for the ARB PQAO 

Appendix A of 40 CFR 58 includes requirements for collocation of samplers as 

part of quality checks for the PM2.5, continuous PM2.5, PM10, and lead (Pb) 

monitoring networks. The CFR contains separate collocation requirements for 

these monitors. The requirements are to be met for each primary quality 

assurance organization (PQAO). Four PQAOs exist in California, one each for 

the San Francisco Bay Area AQMD, San Diego County APCD, and South Coast 

AQMD, and one for the remainder of the State that is called the ARB PQAO. 

PM2.5 Collocation Status 

For PM2.5, the CFR requires that for each type of PM2.5 federal reference method 

(FRM), 15% of the sites within a PQAO have a collocated monitor of the same 

type. Three types of PM2.5 FRMs exist currently in the ARB PQAO. Collocation 

requirements apply to each method type. The types of PM2.5 samplers are: R&P 

Non-sequential (117), R&P Sequential (118), and Thermo Scientific (145). For 

method 117, the collocation site is Victorville. For method 118, the collocation 

sites are: Bakersfield-California, Fresno-Garland, Sacramento-Del Paso Manor 

and Truckee. For method 145, both the Calexico-Ethel and Keeler sites are 

collocated with the same manual method. Table 9 shows that the ARB PQAO 

met the collocation requirement for PM2.5 FRM. Also, Table 9 lists the collocation 

sites by method type. 

Table 9 

Collocation Requirements for PM2.5 FRM 

Method Code 

Number of 

Primary 

Monitors 

Number of 

Required 

Collocated 

Monitors 

Number of 

Active 

Collocated 

Monitors 

117 9 1 1 

118 25 4 4 

145 2 1 2 

 Method 117 (R&P non-seq.): Victorville 

 Method 118 (R&P seq.): Bakersfield, Fresno, Sacramento and Truckee 

 Method 145 (Thermo): Calexico and Keeler 

The CFR also requires that for each continuous PM2.5 federal equivalent method 

(FEM), 15% of the sites must be collocated, but that the first collocation monitor 

is an FRM, the second an FEM, and so on alternating FRM with FEM as 

additional collocation monitors are required. At the time this report was drafted, 

32 sites in the ARB PQAO operate continuous PM2.5 FEM monitors and 

representing three method types. The three methods are the Met-One BAM 

(170), Thermo Scientific TEOM (181) and Grimm (195) of which 30 sites in the 
_______________________________________________________________________ 

35 Annual Monitoring Network Report for Twenty-three Districts in California

ARB PQAO are operating method 170 and one site each is operating method 

181 and 195. For method 170, the 30 sites in the ARB PQAO require that five 

sites are collocated of which the first, third, and fifth collocations are between an 

FEM/FRM and the second and fourth collocations are between an FEM/FEM. 

There are currently five FEM/FRM sites in the ARB PQAO: El Rio, FresnoGarland, Merced, Modesto and Thousand Oaks. In addition, there is an 

FEM/FEM collocation site located at the Stockton-Hazelton site. However, to 

meet this collocation requirement, the ARB PQAO needs an additional FEM/FEM 

site. The ARB is evaluating monitoring locations in the ARB PQAO to determine 

where two continuous PM2.5 FEM monitors could be added to the site without 

comprising other monitoring requirements. 

For methods 181 and 195, which are located at the Keeler and Humboldt Hill 

sites, respectively, these sites would need to add a PM2.5 FRM monitor to each of 

the sites to meet continuous PM2.5 collocation requirements. The Great Basin 

Unified District plans to discontinue one of the two PM2.5 FRM monitors at the 

Keeler site and re-designate the continuous PM2.5 FEM monitor as the primary 

monitor at this site to meet collocation requirements. The North Coast Unified 

District plans to discontinue the PM2.5 FRM at the Eureka-Jacob site and add it to 

the Humboldt Hill site to meet collocation requirements. Table 10 summarizes 

the collocation requirements for continuous PM2.5 FEM in the ARB PQAO, also 

listing the names of the continuous PM2.5 collocation sites. 

 

Table 10 

Collocation Requirements for continuous PM2.5 FEM 

Method 

Code 

Number of 

Primary 

Monitors 

Number of 

Required 

Collocated 

Monitors 

Number of 

Active 

Collocated 

FRM Monitors

Number of Active 

Collocated FEM 

Monitors (same 

method designation 

as primary) 

170 30 5 5 1 (need to add 1) 

181 1 1 0 (need 1) 0 

195 1 1 0 (need 1) 0 

FEM/FRM sites: El Rio, Fresno, Merced, Modesto and Thousand Oaks 

FEM/FEM site: Stockton 

California is a very large state in which environmental conditions 

(e.g., temperature, precipitation, humidity, wind speeds, and elevation) vary 

widely and the composition of the PM2.5 varies significantly. Also, a large number 

of operating agencies operate sites in the statewide PM2.5 network. ARB and 

local air districts designed the locations of collocated PM2.5 samplers to strike a 

balance in adequately representing all of these factors. In this way, the quality 

control function of the collocated monitoring is best realized. While Appendix A of 

40 CFR 58 requires 80% of the collocated monitors to be within + 20% of the 
_______________________________________________________________________ 

36 Annual Monitoring Network Report for Twenty-three Districts in California

applicable federal air quality standard, focusing on achieving this was deemed to 

result in too much clustering of the collocated monitors in too few of the factors 

needing representation. 

PM10 Collocation Status 

The CFR also requires that 15% of PM10 sites with manual monitoring have 

collocated samplers. For this assessment, the ARB combines all of the PM10

FRM monitors regardless of its method type to get the total number of required 

collocation sites in the ARB PQAO. Currently, there are 63 PM10 FRM sites in 

the ARB PQAO of which five sites are already collocated. The collocation sites 

are: 

 Bakersfield-California 

 El Capitan 

 Fresno-Drummond 

 Sacramento-Del Paso Manor 

 Simi Valley 

To meet the PM10 collocation requirement, the ARB PQAO needs four additional 

PM10 collocation sites. ARB is initiating a phased approach to meeting the PM10

collocation requirement. The first step is to replace PM10 FRM monitors with 

continuous PM10 FEM monitors. Continuous monitors are useful for real-time 

reporting and forecasting, and are less expensive to maintain compared to filter 

monitors. To supplement the existing PM10 collocation network in the ARB 

PQAO, ARB plans to add some of the discontinued PM10 FRM monitors to the 

existing PM10 network to increase the number of collocation sites in the ARB 

PQAO. ARB will also coordinate with the districts, if necessary, to ensure that the 

PM10 collocation requirement is met. This proposal is detailed in Table 13 in 

Section 10 of this report. 

 

Lead Collocation Status 

On December 14, 2010, U.S. EPA finalized the rule for the revised federal lead 

(Pb) standard, which also specifies the collocation requirements for Pb. The 

regulations specify that PQAOs that have a combination of source and 

non-source Pb sites have 15% of their Pb monitoring sites collocated. The 

regulations also require that the Pb network be treated independently from the 

PM network, and that the first collocation site be at the highest Pb concentration 

site within the network. Moreover, the regulations specify that if a PQAO has no 

source or non-source Pb monitoring, and the only Pb monitoring is conducted at 

NCore sites, then the collocated Pb monitor must be of the same method 

designation as the primary Pb monitor. 

The ARB PQAO requires no source or non-source Pb monitoring. However, the 

ARB PQAO does have two NCore sites which are located at Fresno-Garland and 
_______________________________________________________________________ 

37 Annual Monitoring Network Report for Twenty-three Districts in California

Sacramento-Del Paso Manor. The Pb rule stated that PQAOs with only NCore 

and no source-oriented Pb monitoring do not have to collocate for Pb. The ARB 

PQAO does not require any collocation for Pb. 

Federal Background, Transport, Max Concentration and Area-wide PM2.5

Monitoring Requirements 

Federal monitoring also required that the network plan list sites in California that 

represent background, transport, maximum concentration or area-wide 

monitoring for PM2.5. From a statewide perspective, background sites are 

intended to quantify regionally representative PM2.5 concentrations for sites 

located away from populated areas and other significant emission sources. The 

following sites serve as regional background sites in California: 

Northern California background site - Point Reyes National Seashore 

Southern California background site – San Rafael Wilderness 

For transport monitoring, ARB has identified two PM2.5 sites covered in the 

geographical area of this report as transport sites. They are the Vallejo and 

Roseville sites, which captures pollutant transport from the Bay Area to the 

Sacramento region and pollutant transport from Sacramento to the outlying areas 

of Sacramento, respectively. Finally, for maximum concentration and area-wide 

monitoring, ARB has identified six PM2.5 sites. The maximum concentration and 

area-wide PM2.5 sites covered in this report are listed below. Note that not all 

PM2.5 sites are designated as background, transport, maximum concentration or 

area-wide. There are other monitoring purposes, for example quality assurance 

monitoring, a monitor can also serve. 

Maximum-Concentration PM2.5 Sites: Area-Wide PM2.5 Sites:

Portola Grass Valley 

Lancaster Ridgecrest 

Chico Woodland 
_______________________________________________________________________ 

38 Annual Monitoring Network Report for Twenty-three Districts in California

Section 7. Federal Air Quality Assurance

The information below, along with the information available via the web link 

(http://www.arb.ca.gov/aaqm/qa/qa.htm), describes the status of compliance with 

the requirements of 40 CFR 58, Appendices A, C, and E. The annual network 

plan is required to include such information. 

Overview 

ARB’s Quality Management Branch (QMB) conducts annual performance 

evaluations (audits) for each SO2, NO2, O3, H2S, and CO gaseous analyzer 

operating at ambient air monitoring stations. Semi-annual performance 

evaluations are conducted for each PM monitor operating at the stations. Each 

gaseous analyzer is audited at three levels using known concentrations of 

National Institute of Standards and Technology (NIST) certified traceable gases 

while the PM monitor audits are conducted with a volumetric continuous flow 

device which is certified against NIST traceable primary standards. Additionally, 

laboratory mass analysis and meteorological performance audits are conducted 

annually. Laboratory audits utilize NIST certified weights, a hygrometer, and a 

temperature sensor to verify the accuracy of the balances and relative humidity 

and temperature sensors. Meteorological audits are conducted with instruments 

that are NIST traceable and/or manufacturer-certified. All of the audits performed 

by QMB are conducted in accordance with the 40 CFR 58, Appendix A. 

QMB also conducts system audits to determine whether a district’s air monitoring 

program satisfies the requirements of 40 CFR Part 58 and U.S. EPA's Quality 

Assurance Handbook for Air Pollution Measurement Systems, Volume II, 

December, 2008. Compliance with these regulations is necessary if the data are 

to be considered data-for-record per the California Code of Regulations (Title 17, 

Article 3, section 70301). Data meeting these requirements are eligible to be 

used in actions taken pursuant to the federal and California Clean Air Acts. 

If a discrepancy is identified during an audit an Air Quality Data Action (AQDA) 

request is issued to the station operator. All AQDA’s must be investigated and 

resolved to bring the station into compliance. The station operator completes the 

AQDA by documenting the resolution, specifying the time period during which 

data was potentially affected, and recommending whether the data is to be 

released, flagged, corrected, or invalidated. QMB reviews the completed AQDA 

and discusses any concerns with the operator. A finalized copy of the AQDA is 

forwarded to the operator and the ARB’s Air Quality Analysis Section. Other 

issues identified outside of the audit process that may impact or potentially 

impact data quality is documented through the Corrective Action Notification 

(CAN) process. 
_______________________________________________________________________ 

39 Annual Monitoring Network Report for Twenty-three Districts in California

Air Monitoring Station Quality Assurance 

In addition to the annual instrument performance audits, QMB conducts siting 

evaluations. Physical measurements and observations, including probe or 

sampler inlet or sensor height above ground level, distance from trees, type of 

ground cover, residence time, obstructions to air flow, distance to local sources, 

topography, vehicle counts, predominant wind direction, and probe material are 

noted on the site survey or accompanying documentation to determine 

compliance with 40 CFR Part 58, Appendix E requirements. 

QMB also ensures the quality of the data collected by the air monitoring stations 

operating in California through analysis of precision data submitted to the U.S. 

EPA’s Air Quality System (AQS) database. Precision checks for 

gaseous/continuous samplers are required once every two weeks. These 

precision checks are conducted nightly at ARB and some district operated sites, 

and weekly or bi-weekly at other district sites. Precision checks for noncontinuous, collocated particulate samplers are to be performed at least every 

twelfth day. QMB staff analyzes the precision data in accordance with 

40 CFR 58, Appendix A. 

Air monitoring staff performs a one-point flow rate verification check once every 

month on filter-based PM10 and PM2.5 monitors and twice a month on PM10 BAM

and PM2.5 BAM automated analyzers. Air monitoring staff reviews these data and 

takes corrective action when the results exceed U.S. EPA’s requirements. These 

flow rate verifications are used to assess bias of the automated instruments in 

accordance with 40 CFR Part 58, Appendix A, 3.2.3. These bias estimates are 

further verified by the semi-annual flow rate audits that are conducted five to 

seven months apart in each calendar year. In the course of auditing the PM2.5

FRM and continuous samplers, the date of the last two flow rate and leak checks 

performed by the air monitoring staff are recorded. Any deviation of the CFR 

requirements discovered by QMB during these audits is addressed through an 

AQDA. 

Information about each air monitoring station audited by QMB is available at: 

http://www.arb.ca.gov/qaweb/site.php. This web page includes the map location 

of each site, latitude and longitude coordinates as determined by GPS, site 

photos, and a detailed site survey of the physical parameters and conditions at 

each site. 

The 2012 calendar year audit dates for both the gaseous analyzers and PM 

monitors operating at the monitoring sites covered in this report are provided in 

Table 11. Audit results are directly submitted to AQS quarterly per Appendix A of 

40 CFR 58. In addition, as required by 40 CFR 58.15, ARB submits a data 

certification letter along with the required AQS reports (AMP450NC and AMP600) 

to U.S.EPA, annually. 
_______________________________________________________________________ 

40 Annual Monitoring Network Report for Twenty-three Districts in California

Table 11 

2012 Audit Date Information for the Monitors in this Plan 

Site Name Gaseous Audit First Flow Audit Second Flow Audit 

Middletown-Anderson Springs 8/22/2012 2/22/2012 8/22/2012 

Anderson-North Street 4/10/2012 4/10/2012 10/1/2012 

Auburn 8/14/2012 2/8/2012 8/14/2012 

Barstow 2/9/2012 2/9/2012 8/8/2012 

Blythe-Murphy Street 2/7/2012 

Canebrake 3/14/2012 9/10/2012 

Chester 7/10/2012 12/6/2012 

Chico-Manzanita 1/10/2012 1/10/2012 CLOSED 

Cloverdale 5/23/2012 11/14/2012 

Colfax-City Hall 8/15/2012 2/8/2012 8/15/2012 

Colusa-Sunrise Blvd 9/26/2012 3/13/2012 9/26/2012 

Cool (seasonal) 7/25/2012 

Davis-UCD Campus 10/29/2012 4/26/2012 10/29/2012 

Echo Summit (seasonal) 8/13/2012 

Fort Bragg-N Franklin Street CLOSED 

Glenbrook 8/22/2012 2/22/2012 8/22/2012 

Grass Valley-Litton Building 7/23/2012 1/24/2012 7/23/2012 

Gridley 3/13/2012 9/26/2012 

Guerneville-Church and 1st 5/22/2012 11/14/2012 

Healdsburg - Matheson 5/22/2012 11/14/2012 

Healdsburg-Municipal Airport 5/22/2012 

Hesperia-Olive Street 2/22/2012 2/22/2012 8/7/2012 

Jackson-Clinton Road 5/29/2012 

Jerseydale 10/2/2012 

Joshua Tree National Monument 2/8/2012 

Lakeport-Lakeport Blvd 8/23/2012 2/22/2012 8/23/2012 

Lancaster-Division Street 2/15/2012 2/15/2012 8/7/2012 // 9/11/2012 

Lassen Volcanic National Park 4/10/2012 

Lucerne Valley - Middle School 2/22/2012 8/8/2012 

Mojave 3/15/2012 3/15/2012 9/11/2012 

Paradise - Airport 7/18/2012 

Phelan-Beekley Road & Phelan 2/14/2012 

Placerville-Gold Nugget Way 8/16/2012 

Portola - Nevada Street 7/10/2012 12/6/2012 

Quincy-N Church Street 7/10/2012 12/6/2012 

Red Bluff - Main Street 1/9/2012 7/16/2012 

Red Bluff-Messer Drive 1/9/2012 7/16/2012 

Red Bluff-Oak Street 7/16/2012 
_______________________________________________________________________ 

41 Annual Monitoring Network Report for Twenty-three Districts in California

Site Name Gaseous Audit First Flow Audit Second Flow Audit

Redding - Health Department 4/10/2012 4/10/2012 10/1/2012

Ridgecrest - California Ave 3/14/2012 9/11/2012 

Roseville-N Sunrise Blvd 3/12/2012 3/12/2012 9/14/2012 

San Andreas-Gold Strike Road 5/30/2012 5/30/2012 11/29/2012 

Shasta Lake - Lake Blvd 4/9/2012 

Shasta Lake-La Mesa 4/9/2012 10/1/2012 

Sonora - Barretta Street 5/29/2012 

South Lake Tahoe-Sandy Way 2/9/2012 8/13/2012 

Sutter Buttes (seasonal) 9/19/2012 

Trona - Athol/Telescope #2 12/18/2012 7/13/2012 12/18/2012 

Truckee - Fire Station 7/12/2012 12/19/2012 

Tuscan Butte (seasonal) 9/5/2012 

Ukiah - Gobbi Street 5/23/2012 

Ukiah - Library 5/23/2012 11/13/2012 

Vacaville-Merchant Street 2/6/2012 7/17/2012 

Vacaville-Ulatis Drive 7/17/2012 

Victorville - Park Avenue 2/23/2012 2/23/2012 8/7/2012 

West Sacramento-15th Street 2/6/2012 7/17/2012 

White Cloud (seasonal) 7/12/2012 

Willits - Justice Center 5/23/2012 11/13/2012 

Willows-Colusa 7/19/2012 1/17/2012 7/19/2012 

Woodland-Gibson Road 7/18/2012 1/17/2012 7/18/2012 

Yosemite Natl Park-Turtleback 10/1/2012 

Yosemite Village - Visitor Center 4/12/2012 10/1/2012 

Yreka 4/11/2012 4/11/2012 10/3/2012 

Yuba City 8/9/2012 1/10/2012 7/19/2012 

 
_______________________________________________________________________ 

42 Annual Monitoring Network Report for Twenty-three Districts in California

Section 8. Operating schedules 

The CFR requires that the annual network plan include information about 

operating schedules. While gaseous monitors (e.g., O3, CO, NO2, SO2) and 

particulate monitoring with FEMs usually operate continuously throughout the 

year, particulate monitoring with FRMs often operate one day out of every three 

days or one day out of every six days. The primary reason why particulate FRMs 

operate less frequently is that the particulate FRMs are filter-based and therefore 

much more labor intensive, requiring that field staff frequently retrieve and 

replace filters and that laboratory staff pre- and post-weigh filters. The 

continuous gaseous and particulate monitors produce hourly measurements of 

the gaseous and particulate pollutants, while the particulate filter-based monitors 

produce 24-hour measurements of particulate pollutants. 

Particulate matter operating schedules 

Current operating schedules for PM2.5 FRM monitors in the areas included in this 

report are listed in Table 12. These schedules were obtained from the U.S. EPA’s 

AQS database. In March 2013, EPA provided to ARB an annual network plan 

checklist which includes a finding that requires ARB to justify the reduced 

sampling frequency of the PM2.5 FRM monitors that are covered in this report for 

which are operating on a 1-in-6 day schedule. Federal regulations required that 

PM2.5 FRM monitors operate one day out of every three days unless certain 

monitoring criteria are met and U.S. EPA approves the sampling frequency 

reduction. The ARB is in the process of addressing this finding by requesting 

U.S. EPA approval for the reduction of the sampling frequency for the PM2.5 FRM 

monitors covered in this report.

While there are a number of continuous PM2.5 monitors deployed, most of these 

are not federal equivalent methods (FEM). In March of 2008, U.S. EPA approved 

the first continuous PM2.5 FEM. Then on June 2009 and March 2011, U.S. EPA 

approved two more continuous PM2.5 FEMs. At the time this report was drafted, 

in the ARB PQAO, there are 32 continuous PM2.5 FEM sites. However, in the 

areas covered by this report, there are only six continuous PM2.5 FEM sites that 

are currently reporting data into the AQS database. The six sites are Mojave, 

San Andreas, Ukiah, Willits, Auburn and Red Bluff. 

Operating schedules for the manual PM10 samplers in the areas included in this 

report all operate on a 1-in-6 day schedule. There are also six continuous PM10

monitors operating in the area that this report covers, which are reporting data 

into AQS. These monitors are located at the South Lake Tahoe, Fort Bragg, 

Mojave, Lancaster, Trona, and Victorville sites. These continuous PM10 monitors 

are FEMs and are either BAM or TEOM monitors. 
_______________________________________________________________________ 

43 Annual Monitoring Network Report for Twenty-three Districts in California

Table 12 

Current PM2.5 FRM Operating Schedules 

(Monitors of the air districts included in this report) 

Site Name County 

AQS Site 

Number Current Laboratory 

Chico-East Butte 060070008 Everyday ARB 

Colusa-Sunrise Blvd Colusa 060111002 1 in 6 day ARB 

Grass Valley-Litton Building Nevada 060570005 1 in 6 day ARB 

Lakeport-Lakeport Blvd Lake 060333001 1 in 6 day LAKE COUNTY 

Lancaster-43301 Division St Los Angeles 060379033 1 in 6 day MOJAVE DESERT 

Portola-222 1st Avenue Plumas 060631007 1 in 3 day ARB 

Quincy-N Church Street Plumas 060631006 1 in 3 day ARB 

Redding-Health Department Roof Shasta 060890004 1 in 6 day ARB 

Ridgecrest-100 West California Kern 060290015 1 in 6 day SAN DIEGO COUNTY 

Roseville-N Sunrise Blvd Placer 060610006 1 in 6 day ARB 

Truckee-Fire Station Nevada 060571001 1 in 3 day ARB 

Victorville-14036 Park Ave San Bernardino 060710306 1 in 6 day MOJAVE DESERT 

Woodland-Gibson Road Yolo 061131003 1 in 6 day ARB 

Yreka-Foothill Drive Siskiyou 060932001 1 in 6 day ARB 

Yuba City-Almond Street Sutter 061010003 Everyday ARB 

Ozone operating schedules 

While most O3 monitors operate continuously all year, a small number of O3 sites 

in the areas included in this report operate only in the warmer six months of the 

year. Several of these sites are at higher elevation where access during the 

winter can be problematic. Also, for most of the State, O3 is a summertime 

problem and concentrations during the winter are well below the levels of the 

ambient air quality standards. The following seasonal O3 sites in the areas 

included in this report all operate from May through October: 

Cool (El Dorado County) 

Echo Summit (El Dorado County) 

Jerseydale (Mariposa County) 

Sutter Buttes (Sutter County) 

Tuscan Butte (Tehama County) 

White Cloud (Nevada County) 

In March 2013, EPA provided to ARB an annual network plan checklist which 

includes a finding that requires ARB to justify the monitoring schedule of the 

seasonal ozone sites that are covered in this report. Federal regulations require 

that ozone monitors operate every day, from January through December, unless 

certain monitoring criteria are met and U.S. EPA approves the seasonal 

schedule. ARB sent a request to the U.S. EPA on June 5, 2013, asking for 
_______________________________________________________________________ 

44 Annual Monitoring Network Report for Twenty-three Districts in California

approval of the monitoring schedule of the seasonal ozone sites covered in this 

report. 

On July 17, 2013, U.S. EPA approved the request. Both the request and 

approval letters are included in Appendix C of this report. Note that U.S. EPA 

had previously approved the seasonal ozone monitoring schedule at the Tuscan 

Butte site. 
_______________________________________________________________________ 

45 Annual Monitoring Network Report for Twenty-three Districts in California

Section 9. Additional information on PM2.5 monitors

This section includes information for two required annual network plan elements 

that relate specifically to PM2.5 and do not fit well elsewhere in the report. One 

required element relates to whether data for a PM2.5 monitor can be used to 

determine compliance with the national annual PM2.5 air quality standard. In the 

CFR, this is termed as the suitability for comparison to the annual standard. The 

other element requires including in the annual network plan information regarding 

the review process followed by air agencies when changes are made to the 

location of a PM2.5 monitor that is violating a PM2.5 standard. 

9.1 Suitability for comparison to the annual PM2.5 standard 

The CFR requires that a PM2.5 FRM or FEM monitor be located at a 

neighborhood scale in order for the data from the monitor to be used in 

regulatory determinations of compliance with the annual PM2.5 standard. For a 

PM2.5 monitor to be representative at a neighborhood scale, the concentration 

values measured by the monitor should be representative of concentrations 

expected over an area with dimensions of a few kilometers. All of the PM2.5 FRM 

monitors in California are sited to be representative of a neighborhood scale and 

meet this suitability requirement. 

9.2 Review of changes to PM2.5 network 

The PM2.5 network of FRM monitors in California was largely established in 1999 

and completed in 2000. Little has changed in the siting of the FRM monitoring 

network between then and now. However, between 2008 and 2011, U.S. EPA 

approved three types of PM2.5 FEMs, which are Met One (method 170), GRIMM 

(method 195) and Thermo (method 181). At the time this report was drafted, five 

agencies (ARB, Eastern Kern, Mendocino County, Placer County and Tehama 

County) in the areas covered by this report have submitted data from these 

monitors to the AQS database. While there is interagency review of proposed 

changes to the State and Local Air Monitoring Stations (SLAMS) network, i.e., the 

network that includes PM2.5 as well as O3, CO, PM10, and other pollutants, no 

unique review process exists specially for PM2.5 FRM or FEM monitors. 

As part of ARB’s ongoing oversight process, ARB requests the opportunity to 

review and comment on the possible regulatory consequences of any proposal to 

move or discontinue a monitor for any pollutant that violates a national or State 

air quality standard. Furthermore, when a local agency proposes to move or 

discontinue a monitor indicating the highest concentrations of a pollutant in an 

area, ARB requests that the agency conduct a period of concurrent or parallel 

monitoring at that site and at the replacement site being proposed to represent 

the area as the required high site for the pollutant. This is expected even when 

the site is close to but not exceeding any standard for the pollutant. The parallel 
_______________________________________________________________________ 

46 Annual Monitoring Network Report for Twenty-three Districts in California

monitoring is typically for a period of many months or a year, depending on the 

pollutant, the standard that is of most concern, and other factors. 
_______________________________________________________________________ 

47 Annual Monitoring Network Report for Twenty-three Districts in California

Section 10. Proposed and recently implemented monitoring site changes 

This section lists the proposed and recently implemented monitoring site 

changes in the areas included in this report, as well as changes to the monitoring 

sites that the ARB conducts in areas outside the stated geographical scope of 

this report. Proposed monitoring site changes include proposals by the ARB or 

by districts that are covered in this report to add, remove, or move sites and/or 

monitors in the monitoring network before the end of 2014. Recently 

implemented monitoring changes include deployed and/or terminated sites and 

monitors in the monitoring network that the ARB has become aware of since last 

year’s report. Listed below are the proposed and implemented changes to the 

monitoring network for which ARB are aware of at this time. 

The ARB proposed or recently implemented the following network modifications: 

 Terminated the ozone monitor at Calexico-East (060250006), which was 

approved by U.S. EPA on April 24, 2013. The approval letter is enclosed 

in Appendix C of this report. 

 Relocated the Chico-Manzanita site (060070002) to a new location on 

East Avenue due to siting issues which could not be rectified. The new 

site is called Chico-East (060070008), which is approximately 0.34 miles 

from the previous location. The ARB formally requested U.S. EPA, via a 

letter, to approve the relocation (enclosed in Appendix C of this report). In 

addition, the sampling frequency of the PM2.5 monitor at this site was 

increased to everyday on January 1, 2013. Moreover, as agreed upon 

between U.S. EPA and ARB, the 2013 PM2.5 design values will be 

calculated by combining the PM2.5 data between the two Chico sites 

(2011 Chico-Manzanita data, 2012 combined data at Chico-Manzanita and 

Chico-East, and 2013 Chico-East data). 

 Relocated the NCore monitoring station at Fresno-1st Street (060190008) 

to Fresno-Garland (060190011). On March 7, 2013, the U.S. EPA 

approved the relocation of the NCore site. The approval letter is enclosed 

in Appendix C of this report. In addition, as agreed upon between 

U.S. EPA and ARB, the 2013 PM2.5 design values will be calculated by 

combining the PM2.5 data between the two Fresno sites 

(2011 Fresno-1st Street data and 2012-2013 Fresno-Garland data). 

 Plans to transfer ownership of the Calexico-Ethel site to the Imperial 

County air district for maintenance and operation. The transfer process is 

still currently being discussed between ARB and Imperial County AQMD. 

 Discontinued the PM10 FRM monitors at Bakersfield-California Street and 

Fresno-Garland. However, due to the need of PM10 ion data, ARB plans 

to reestablish PM10 filter monitoring at these two sites. 
_______________________________________________________________________ 

48 Annual Monitoring Network Report for Twenty-three Districts in California

 Finally, ARB implemented or plans to implement the following 

modifications to the ARB network as listed in Table 13. 

Table 13 

ARB Proposed and Implemented Network Changes 

AQS Site 

# Site Name Parameter Stop date Start date 

060070002 

Chico Manzanita 

(site closed in 

2012) 

CO May-12 

NO2 May-12 

PM10 May-12 

Pb May-12 

O3 Jul-12 

PM2.5 Jul-12 

PM2.5-Hrly Coll Jul-12 

PM2.5 HiVol Jul-12 

PM10-HiVol May-12 

 Pb May-12 

060070008 Chico East 

PM2.5-Hrly Apr-12 

PM2.5-Hrly Coll Apr-12 

NO2 Jun-12 

O3 Jun-12 

Pb Jun-12 

Trace CO Aug-12 

PM2.5-HiVol Apr-12 

PM10-HiVol May-12 

Pb Jun-12 

060111002 Colusa PM10-HiVol 2013 

PM10-BAM 2013 

060831008 Santa Maria 

PM10-HiVol discontinued 

CO Aug-12 

TCO Sep-12 

060830011 Santa Barbara TCO Nov-12 

060771002 Stockton 

CO May-12 

TCO Jun-12 

PM10-HiVol 2013 

PM10-BAM 2013 

061072002 Visalia PM10-HiVol 2013 

PM10-BAM 2013 

060210003 Willows PM10-HiVol 2013 

PM10-BAM 2013 

060431001 Yosemite PM10-HiVol 2013 

PM10-BAM 2013 
_______________________________________________________________________ 

49 Annual Monitoring Network Report for Twenty-three Districts in California

Table 13 (cont.) 

ARB Proposed and Implemented Network Changes 

AQS Site 

# Site Name Parameter Stop date Start date 

060190008 Fresno First (site 

closed in 2012) 

SO2 Jan-12 

NO2 Jan-12 

O3 Jan-12 

PM2.5 hourly Jan-12 

PM2.5 HiVol 

Primary Jan-12 

PM2.5 HiVol Coll Jan-12 

CO Feb 2012 

060190011 Fresno Garland 

SO2 Jan-12 

NO2 Jan-12 

O3 Jan-12 

PM2.5 hourly Jan-12 

PM2.5 HiVol 

Primary Jan-12 

PM2.5 HiVol Coll Jan-12 

PM10-Coarse 

Coloc 2013 

Pb Jan-12 

CO Jan-12 

SO2 Jan-12 

NO2 Jan-12 

061010003 Yuba City PM10-HiVol 2013 

PM10-BAM 2013 

060990005 Modesto PM10-HiVol 2013 

PM10-BAM 2013 

060290011 Mojave PM10-HiVol discontinued 

060290232 Oildale PM10-HiVol 2013 

PM10-BAM 2013 

060790005 Paso Robles PM10-HiVol discontinued 

060610006 Roseville PM10-HiVol 2013 

PM10-BAM 2013 

060670010 Sacramento PM10-HiVol Jun-13 

PM10-BAM Jun-13 

060090001 San Andreas PM10-HiVol 2013 

PM10-BAM 2013 

060792006 San Luis Obispo PM10-HiVol discontinued 

 

 
_______________________________________________________________________ 

50 Annual Monitoring Network Report for Twenty-three Districts in California

Proposed or Implemented District Changes: 

The Antelope Valley APCD replaced the continuous PM10 TEOM with a 

continuous PM10 BAM at the Lancaster site due to equipment failure. 

The Mojave Desert AQMD plans to replace the PM10 FRM monitors at the 

Barstow, Hesperia, Lucerne Valley, Trona and Victorville sites with continuous 

PM10 BAM monitors. In addition, Mojave Desert AQMD replaced the continuous 

PM10 TEOM monitor at the Trona and Victorville sites with continuous PM10 BAM 

monitors on 12/3/2012 and 9/29/2012, respectively. Mojave Desert AQMD plans 

to transition its PM10 FRM network to a continuous PM10 BAM network and 

anticipates submitting both standard and local conditions PM10 BAM data from its 

network. 

The Placer County APCD discontinued ozone monitoring at the Auburn-C Dewitt 

(060610002) site in December 2012 and established ozone monitoring at the 

Auburn-Atwood Street site (060610003) in January 2013. In addition, the Placer 

County APCD plans to establish a permanent site in Tahoe City to monitor for 

ozone and PM2.5. 

The Tehama County APCD plans to relocate the ozone, PM2.5 BAM, and PM10

monitors from three different locations in the city of Red Bluff to a central location 

in the same city consolidating all monitoring at the new district headquarters, 

approximately two miles northwest of the current location. 
_______________________________________________________________________ 

51 Annual Monitoring Network Report for Twenty-three Districts in California

Section 11. Access to more information about the network 

While this report includes a great deal of information about the ambient air quality 

monitoring network, much more information is readily available, including 

summaries of the pollutant data from the monitors around the State. Much of this 

information is available on the web. This section lists a number of additional 

sources of such information. Also listed is contact information for the agencies 

responsible for the monitoring covered in this report. 

ARB’s Monitoring and Laboratory Division (MLD) maintains web pages with 

information about all the existing monitoring sites that routinely monitor and 

submit air quality data in California. The pages also include detailed local maps 

showing the location of the sites. This information can be found at: 

http://www.arb.ca.gov/aaqm/mldaqsb/amn.htm. A more general MLD web page 

that provides links to other aspects of ambient monitoring is located at: 

http://www.arb.ca.gov/aaqm/aaqm.htm. 

Summaries of the official air quality data from sites around the State can be found 

at: http://www.arb.ca.gov/adam/welcome.html. Summaries of the most recent 

preliminary data can be viewed at: http://www.arb.ca.gov/aqd/aqinfo.htm. These 

last two sources of information are maintained by ARB staff of the Air Quality 

Planning and Science Division, as is the following more general web page that 

lists links to other aspects of the ambient air quality data program: 

http://www.arb.ca.gov/aqd/aqdpage.htm. 
_______________________________________________________________________ 

52 Annual Monitoring Network Report for Twenty-three Districts in California

Agency contact for ARB 

Regarding this report and questions relating to the collected ambient air quality 

data: 

Pheng Lee, Air Pollution Specialist, plee@arb.ca.gov, (916) 445-6059 

Regarding the collection of the ambient data: 

Ken Stroud, Chief, Air Quality Surveillance Branch, kstroud@arb.ca.gov, 

(916) 324-7591 

Regarding quality oversight of the monitoring program: 

Mike Miguel, Chief, Quality Management Branch, mmiguel@arb.ca.gov, 

(916) 322-0960 

Agency contacts for the air districts covered in this report 

Amador County Air Pollution Control District, Jackson, CA 

Mike Boitano, Interim Air Pollution Control Officer 

AirDistrict@co.amador.ca.us

(209) 257-0112 

Antelope Valley Air Quality Management District, Lancaster, CA 

Eldon Heaston, Air Pollution Control Officer (also APCO for Mojave Desert) 

eheaston@mdaqmd.ca.gov 

(661) 723-8070 

Butte County Air Quality Management District, Chico, CA 

Jim Wagoner, Air Pollution Control Officer 

jwagoner@bcaqmd.org

(530) 332-9400 

Calaveras County Air Pollution Control District, San Andreas, CA 

Brian Moss, Air Pollution Control Officer 

bmoss@co.calaveras.ca.us

(209) 754-6504 

Colusa County Air Pollution Control District, Colusa, CA 

Harry Krug, Air Pollution Control Officer 

hak@countyofcolusa.org

(530) 458-0590 

Eastern Kern Air Pollution Control District, Bakersfield, CA 

Glen Stephens, Air Pollution Control Officer 

glens@co.kern.ca.us

(661) 862-5250 
_______________________________________________________________________ 

53 Annual Monitoring Network Report for Twenty-three Districts in California

El Dorado County Air Quality Management District, Placerville, CA 

Dave Johnston, Air Pollution Control Officer 

dave.johnston@edcgov.us 

(530) 621-5896 

Feather River Air Quality Management District, Yuba City, CA 

Christopher Brown, Air Pollution Control Officer 

apco@fraqmd.org

(530) 634-7659 x 203 

Glenn County Air Pollution Control District, Willows, CA 

Jim Donnelly, Air Pollution Control Officer 

jdonnelly@countyofglenn.net

(530) 934-6500 

Lake County Air Quality Management District, Lakeport, CA 

Douglas Gearhart, Air Pollution Control Officer 

dougg@lcaqmd.net

(707) 263-7000 

Lassen County Air Pollution Control District, Susanville, CA 

Dan Newton, Air Pollution Control Officer 

dnewton@cityofsusanville.org

(530) 257-1045 

Mariposa County Air Pollution Control District, Mariposa, CA 

Dr. Charles Mosher, Air Pollution Control Officer 

air@mariposacounty.org

(209) 966-2220 

Mendocino County Air Quality Management District, Ukiah, CA 

Robert Scaglione, Air Pollution Control Officer 

mcaqmd@co.mendocino.ca.us

(707) 463-4354 

Modoc County Air Pollution Control District, Alturas, CA 

Joe Moreo, Air Pollution Control Officer 

apcd@modoccounty.us

(530) 233-5522 

Mojave Desert Air Quality Management District, Lancaster, CA 

Eldon Heaston, Air Pollution Control Officer (also APCO for Antelope Valley) 

eheaston@mdaqmd.ca.gov 

(661) 723-8070 
_______________________________________________________________________ 

54 Annual Monitoring Network Report for Twenty-three Districts in California

Northern Sierra Air Quality Management District, Grass Valley, CA 

Gretchen Bennitt, Air Pollution Control Officer 

Gretchen@myairdistrict.com

(530) 274-9360 

Northern Sonoma County Air Pollution Control District, Healdsburg, CA 

Barbara Lee, Air Pollution Control Officer 

nsc@sonic.net

(707) 433-5911 

Placer County Air Pollution Control District, Auburn, CA 

Tom Christofk, Air Pollution Control Officer 

pcapcd@placer.ca.gov

(530) 745-2330 

Shasta County Air Quality Management District, Redding, CA 

Russ Mull, Air Pollution Control Officer 

scdrm@snowcrest.net

(530) 225-5789 

Siskiyou County Air Pollution Control District, Yreka, CA 

Eric Olson, Air Pollution Specialist 

eolson@co.siskiyou.ca.us

(530) 841-4031 

Tehama County Air Pollution Control District, Red Bluff, CA 

Alan Abbs, Air Pollution Control Officer 

aabbs@tehcoapcd.net

(530) 527-3717 

Tuolumne County Air Pollution Control District, Columbia, CA 

Bill Sandman, Deputy Air Pollution Control Officer 

bsandman@co.tuolumne.ca.us

(209) 533-5693 

Yolo-Solano Air Quality Management District, Davis, CA 

Mat Ehrhardt, Air Pollution Control Officer 

meharhard@ysaqmd.org

(530) 757-3673 
_______________________________________________________________________ 

55 Annual Monitoring Network Report for Twenty-three Districts in California

APPENDIX A

Regulatory language of 40 CFR 58.10 

§ 58.10 Annual monitoring network plan and periodic network assessment. 

(a)(1) Beginning July 1, 2007, the State, or where applicable local, agency 

shall adopt and submit to the Regional Administrator an annual monitoring 

network plan which shall provide for the establishment and maintenance of an air 

quality surveillance system that consists of a network of SLAMS monitoring 

stations including FRM, FEM, and ARM monitors that are part of SLAMS, NCore 

stations, STN stations, State speciation stations, SPM stations, and/or, in serious, 

severe and extreme ozone nonattainment areas, PAMS stations, and SPM 

monitoring stations. The plan shall include a statement of purposes for each 

monitor and evidence that siting and operation of each monitor meets the 

requirements of appendices A, C, D, and E of this part, where applicable. The 

annual monitoring network plan must be made available for public inspection for 

at least 30 days prior to submission to EPA. 

(2) Any annual monitoring network plan that proposes SLAMS network 

modifications (including new monitoring sites, new determinations that data are 

not of sufficient quality to be compared to the NAAQS, and changes in 

identification of monitors as suitable or not suitable for comparison against the 

annual PM 2.5 NAAQS) is subject to the approval of the EPA Regional 

Administrator, who shall provide opportunity for public comment and shall 

approve or disapprove the plan and schedule within 120 days. If the State or 

local agency has already provided a public comment opportunity on its plan and 

has made no changes subsequent to that comment opportunity, and has 

submitted the received comments together with the plan, the Regional 

Administrator is not required to provide a separate opportunity for comment. 

(3) The plan for establishing required NCore multipollutant stations shall be 

submitted to the Administrator not later than July 1, 2009. The plan shall provide 

for all required stations to be operational by January 1, 2011. 

(4) A plan for establishing source-oriented Pb monitoring sites in accordance 

with the requirements of appendix D to this part for Pb sources emitting 1.0 tpy or 

greater shall be submitted to the EPA Regional Administrator no later than July 1, 

2009, as part of the annual network plan required in paragraph (a)(1) of this 

section. The plan shall provide for the required source-oriented Pb monitoring 

sites for Pb sources emitting 1.0 tpy or greater to be operational by January 1, 

2010. A plan for establishing source-oriented Pb monitoring sites in accordance 

with the requirements of appendix D to this part for Pb sources emitting equal to 

or greater than 0.50 tpy but less than 1.0 tpy shall be submitted to the EPA 

Regional Administrator no later than July 1, 2011. The plan shall provide for the 

required source-oriented Pb monitoring sites for Pb sources emitting equal to or 

greater than 0.50 tpy but less than 1.0 tpy to be operational by December 27, 

2011. 
_______________________________________________________________________ 

56 Annual Monitoring Network Report for Twenty-three Districts in California

(5)(i) A plan for establishing or identifying an area-wide NO2 monitor, in 

accordance with the requirements of Appendix D, section 4.3.3 to this part, shall 

be submitted as part of the Annual Monitoring Network Plan to the EPA Regional 

Administrator by July 1, 2012. The plan shall provide for these required monitors 

to be operational by January 1, 2013. 

(ii) A plan for establishing or identifying any NO2 monitor intended to 

characterize vulnerable and susceptible populations, as required in Appendix D, 

section 4.3.4 to this part, shall be submitted as part of the Annual Monitoring 

Network Plan to the EPA Regional Administrator by July 1, 2012. The plan shall 

provide for these required monitors to be operational by January 1, 2013. 

(iii) A plan for establishing a single near-road NO2 monitor in CBSAs having 

1,000,000 or more persons, in accordance with the requirements of Appendix D, 

section 4.3.2 to this part, shall be submitted as part of the Annual Monitoring 

Network Plan to the EPA Regional Administrator by July 1, 2013. The plan shall 

provide for these required monitors to be operational by January 1, 2014. 

(iv) A plan for establishing a second near-road NO2 monitor in any CBSA 

with a population of 2,500,000 or more persons, or a second monitor in any 

CBSA with a population of 500,000 or more persons that has one or more 

roadway segments with 250,000 or greater AADT counts, in accordance with the 

requirements of Appendix D, section 4.3.2 to this part, shall be submitted as part 

of the Annual Monitoring Network Plan to the EPA Regional Administrator by July 

1, 2014. The plan shall provide for these required monitors to be operational by 

January 1, 2015. 

(v) A plan for establishing a single near-road NO2 monitor in all CBSAs 

having 500,000 or more persons, but less than 1,000,000, not already required 

by paragraph (a)(5)(iv) of this section, in accordance with the requirements of 

Appendix D, section 4.3.2 to this part, shall be submitted as part of the Annual 

Monitoring Network Plan to the EPA Regional Administrator by July 1, 2016. The 

plan shall provide for these monitors to be operational by January 1, 2017. 

(6) A plan for establishing SO2 monitoring sites in accordance with the 

requirements of appendix D to this part shall be submitted to the EPA Regional 

Administrator by July 1, 2011 as part of the annual network plan required in 

paragraph (a) (1). The plan shall provide for all required SO2 monitoring sites to 

be operational by January 1, 2013. 

(7) A plan for establishing CO monitoring sites in accordance with the 

requirements of appendix D to this part shall be submitted to the EPA Regional 

Administrator. Plans for required CO monitors shall be submitted at least six 

months prior to the date such monitors must be established as required by 

section 58.13. 
_______________________________________________________________________ 

57 Annual Monitoring Network Report for Twenty-three Districts in California

(8)(i) A plan for establishing near-road PM 2.5 monitoring sites in CBSAs 

having 2.5 million or more persons, in accordance with the requirements of 

appendix D to this part, shall be submitted as part of the annual monitoring 

network plan to the EPA Regional Administrator by July 1, 2014. The plan shall 

provide for these required monitoring stations to be operational by January 1, 

2015. 

(ii) A plan for establishing near-road PM 2.5 monitoring sites in CBSAs having 

1 million or more persons, but less than 2.5 million persons, in accordance with 

the requirements of appendix D to this part, shall be submitted as part of the 

annual monitoring network plan to the EPA Regional Administrator by July 1, 

2016. The plan shall provide for these required monitoring stations to be 

operational by January 1, 2017. 

(b) The annual monitoring network plan must contain the following 

information for each existing and proposed site: 

(1) The AQS site identification number. 

(2) The location, including street address and geographical coordinates. 

(3) The sampling and analysis method(s) for each measured parameter. 

(4) The operating schedules for each monitor. 

(5) Any proposals to remove or move a monitoring station within a period of 

18 months following plan submittal. 

(6) The monitoring objective and spatial scale of representativeness for each 

monitor as defined in appendix D to this part. 

(7) The identification of any sites that are suitable and sites that are not 

suitable for comparison against the annual PM 2.5 NAAQS as described in § 

58.30. 

(8) The MSA, CBSA, CSA or other area represented by the monitor. 

(9) The designation of any Pb monitors as either source-oriented or nonsource-oriented according to Appendix D to 40 CFR part 58. 

(10) Any source-oriented monitors for which a waiver has been requested or 

granted by the EPA Regional Administrator as allowed for under paragraph 

4.5(a)(ii) of Appendix D to 40 CFR part 58. 

(11) Any source-oriented or non-source-oriented site for which a waiver has 

been requested or granted by the EPA Regional Administrator for the use of 
_______________________________________________________________________ 

58 Annual Monitoring Network Report for Twenty-three Districts in California

Pb-PM10 monitoring in lieu of Pb-TSP monitoring as allowed for under paragraph 

2.10 of Appendix C to 40 CFR part 58. 

(12) The identification of required NO2 monitors as near-road, area-wide, or 

vulnerable and susceptible population monitors in accordance with Appendix D, 

section 4.3 of this part. 

(13) The identification of any PM 2.5 FEMs and/or ARMs used in the 

monitoring agency's network where the data are not of sufficient quality such that 

data are not to be compared to the NAAQS. For required SLAMS where the 

agency identifies that the PM 2.5 Class III FEM or ARM does not produce data of 

sufficient quality for comparison to the NAAQS, the monitoring agency must 

ensure that an operating FRM or filter-based FEM meeting the sample frequency 

requirements described in § 58.12 or other Class III PM 2.5 FEM or ARM with data 

of sufficient quality is operating and reporting data to meet the network design 

criteria described in appendix D to this part. 

(c) The annual monitoring network plan must document how state and local 

agencies provide for the review of changes to a PM 2.5 monitoring network that 

impact the location of a violating PM 2.5 monitor. The affected state or local 

agency must document the process for obtaining public comment and include 

any comments received through the public notification process within their 

submitted plan. 

(d) The state, or where applicable local, agency shall perform and submit to 

the EPA Regional Administrator an assessment of the air quality surveillance 

system every 5 years to determine, at a minimum, if the network meets the 

monitoring objectives defined in appendix D to this part, whether new sites are 

needed, whether existing sites are no longer needed and can be terminated, and 

whether new technologies are appropriate for incorporation into the ambient air 

monitoring network. The network assessment must consider the ability of existing 

and proposed sites to support air quality characterization for areas with relatively 

high populations of susceptible individuals (e.g., children with asthma), and, for 

any sites that are being proposed for discontinuance, the effect on data users 

other than the agency itself, such as nearby states and tribes or health effects 

studies. The state, or where applicable local, agency must submit a copy of this 

5-year assessment, along with a revised annual network plan, to the Regional 

Administrator. The assessments are due every five years beginning July 1, 2010. 

(e) All proposed additions and discontinuations of SLAMS monitors in annual 

monitoring network plans and periodic network assessments are subject to 

approval according to § 58.14. 
_______________________________________________________________________ 

59 Annual Monitoring Network Report for Twenty-three Districts in California

APPENDIX B 

For ozone, PM10, and PM2.5, the required minimum number of monitors are 

based on the population of the core-based statistical area (CBSA) and the 

severity of the air quality for the pollutant in the CBSA. The tables below list the 

CBSAs, population of the CBSAs, and the site in each CBSA that is currently 

measuring the highest concentration. In all cases, sufficient monitoring exists, 

and no additional monitoring is required. 

Minimum Monitoring Requirements for O3, PM10, and PM2.5 

Ozone

Minimum Monitoring Requirements for Ozone.

Bakersfield*^ Kern 839,361 0.093 ppm Edison 2 8 0

Chico Butte 220,000 0.077 ppm Paradise-4405 Airport Road 1 2 0

Los Angeles-Long BeachAnahiem* Los Angeles and Orange 12,828,837 0.096 ppm Santa Clarita 4 19 0

Redding Shasta 177,223 0.069 ppm Shasta Lake-13791 Lake Blvd 1 4 0

Riverside-San BernardinoOntario* Riverside and San Bernardino 4,224,851 0.106 ppm Crestline 3 20 0

Sacramento-Arden ArcadeRoseville*El Dorado, Placer, Sacramento, 

and Yolo 2,149,127 0.095 ppm Folsom-Natoma Street 2 14 0

Santa Rosa* Sonoma 483,878 0.047 ppm Santa Rosa-5th Street 1 2 0

Vallejo-Fairfield* Solano 413,344 0.068 ppm Fairfield-Chadbourne Road^^ 2 3 0

Yuba City^^^ Sutter and Yuba 166,892 0.066 ppm Yuba City-Almond Street 1 1 0

* Parts of these CBSAs are included in the geographical scope of this report, and parts are within the geographical scope of the reports being completed by the districts.

See Table 5a for the completed list of CBSAs in California. The numbers of active ozone monitors listed are for the entire CBSA (see below for site details). Only ozone

monitors that are part of the SLAMS network are counted towards this monitoring requirement.

^ The 3-year average of the 4th highest concentration usually represents the design value. However, prior to 2011, the highest concentrations in the Bakersfield CBSA 

were measured at Arvin-Bear Mountain, which has a 2010 design value of 0.104 ppm. A replacement site for the Arvin-Bear Mountian site has not yet been deployed, so

the 3-year average of the 4th highest concentration at Edison of 0.093 ppm does not represent the design value for the Bakersfield CBSA.

^^ The Fairfield site is a seasonal site (April -November).

^^^ The Sutter Buttes site in the Yuba City CBSA was not counted towards this requirement because it is a Special Purpose Monitor (SPM) site.

Ozone sites for which are counted towards minimum monitoring requirements.

CBSA Site CBSA Site CBSA Site

Arvin-DiGorgio Chico-East Auburn

Bakersfield-California Paradise Colfax

Bakersfield-Municipal Airport Davis

Edison CBSA Site Elk Grove

Maricopa Anderson Folsom

Mojave Lassan Volcanic NP Lincoln

Oildale Redding North Highlands

Shafter Shasta Lake Placerville

Roseville

CBSA Site CBSA Site Sac-Del Paso

Anahiem Banning-Airport Sac-Goldenland

Azusa Barstow Sac-T St

Burbank Blyth Sloughhouse

Compton Crestline Woodland

Costa Mesa Elsinore

Glendora Fontana CBSA Site

La Habra Hesperia Healdsburg

Lancaster Indio Santa Rosa

Long Beach Joshua Tree-Cottonwood

Los Angeles-North Main Mira Loma CBSA Site

Los Angeles-Westchester Palm Springs Vallejo

Mission Viejo Perris Vacaville

North Long Beach Phelan Fairfield

Pasadena Redlands

Pico Riveria Riverside-Rubidoux CBSA Site

Pomona San Bernardino

Reseda Trona

Santa Clarita Upland

West Los Angeles Victorville

Westchester

# of Additonal 

Monitors Needed CBSA County(ies) Population (2010 Census)

3-Year Avg of the 

4th Highest 

Concentration

Site with the Highest 3-Yr 

Avg of the 4th Highest 

Concentration

# of 

Monitors 

Required

# of Active 

Monitors

Riverside-San 

Bernardino-Ontario

SacramentoArden 

ArcadeRoseville

Santa Rosa

VallejoFairfield

Yuba City Yuba City-Almond

Bakersfield

Chico

Los Angeles-Long BeachAnahiem

Redding
_______________________________________________________________________ 

60 Annual Monitoring Network Report for Twenty-three Districts in California

PM2.51

Minimum Montoring Requirements for PM2.5 SLAMS.

Bakersfield* Kern 839,361 15.6 Bakersfield-410 E Planz 58 Bakersfield-California Ave 2 4 0

Chico Butte 220,000 9.5** Chico-East** 34** Chico-East** 1 1 0

Los Angeles-Long 

Beach-Anahiem* Los Angeles and Orange 12,828,837 13.1 Los Angeles-North Main 32 Burbank & LA-North Main 3 12 0

Redding Shasta 177,223 5.3 Redding-Health Department 14 Redding-Health Department 0 1 0

Riverside-San 

Bernardino-Ontario*

Riverside and San 

Bernardino 4,224,851 15.6 Mira Loma Van Buren 37 Mira Loma Van Buren 3 10 0

Sacramento-Arden 

Arcade-Roseville*

El Dorado, Placer, 

Sacramento, and Yolo 2,149,127 9.5 Sacramento-DPM 31

Sacramento-DPM, 

Sacramento-T St, and 

Sacramento-Health Dept***

36 0

Santa Rosa* Sonoma 483,878 8 Santa Rosa-5th St 22 Santa Rosa-5th St 0 1 0

Vallejo-Fairfield* Solano 413,344 8.8 Vallejo-304 Tuolumne St 26 Vallejo-304 Tuolumne St 0 1 0

Yuba City Sutter and Yuba 166,892 6.9 Yuba City-Almond 26 Yuba City-Almond 0 1 0

1

Design values are based on both FRM and FEM data. The total number of active PM2.5 monitors include both the filter-based FRMs and the continuous 

FEM PM2.5 monitors that are part of the SLAMS network.

* Parts of these CBSAs are included in the geographical scope of this report, and parts are within the geographical scope of the reports being completed by the districts. 

See Table 5a for the completed list of CBSAs in California. The numbers of active PM2.5 SLAMS monitors listed are for the entire CBSA (see below for site details).

**The Chico-East site started on 4/2/2012. All monitors at the Chico-East site was relocated from the discontinued Chico-Manzanita site. The 2012 design values for the

Chico CBSA were computed by combining the PM2.5 data from the two Chico locations (i.e., Chico-Manzanita and Chico-East).

***These three sites have a 24-hour design value of 31 ug/m3 in 2012.

PM2.5 SLAMS sites for which are counted towards minimum monitoring requirements.

CBSA Site CBSA Site CBSA Site

Bakersfield-California Auburn

Bakersfield-E Planz Roseville

Mojave Sac-Del Paso

Ridgecrest CBSA Site Sac-Health

Sac-T St

CBSA Site Woodland

Anahiem

Azusa CBSA Site CBSA Site

Burbank Big Bear City

Compton Fontana

Lancaster Indio

Los Angeles-North Main Mira Loma CBSA Site

Mission Viejo Ontario

North Long Beach Palm Springs

Pasadena Riverside-Magnolia

Pico Riveria Riverside-Rubiduox CBSA Site

Reseda San Bernardino

South Long Beach Victorville

Bakersfield

Los Angeles-Long 

Beach-Anahiem

Chico-East

Redding Redding-Health Dept

Sacramento-Arden ArcadeRoseville

Chico

Santa Rosa

Yuba City

Riverside-San 

BernardinoOntario

# of Active 

SLAMS 

Sites

# of Additional 

SLAMS Sites 

Needed

Site(s) with the Highest 3-

year Design Value

# of Required 

SLAMS Sites

Yuba CityAlmond

Santa Rosa

Vallejo-Fairfield Vallejo

CBSA County(ies) Population 

(2010 Census)

3-year Highest 

Annual Design 

Value (ug/m3)

Site with the Highest 3-

year Annual Design 

Value

3-year Highest 

24-hr Design 

Value (ug/m3)
_______________________________________________________________________ 

61 Annual Monitoring Network Report for Twenty-three Districts in California

Continuous PM2.51

Minimum Montoring Requirements for continuous PM2.5 monitors.

Bakersfield* Kern 839,361 Bakersfield-California Bakersfield-California 1 3 0

Chico Butte 220,000 Chico-East Chico-East 1 3 0

Los Angeles-Long 

Beach-Anahiem*

Los Angeles and 

Orange 12,828,837 Los Angeles-North Main Burbank & LA-North Main 2 7 0

Redding Shasta 177,223 N/A N/A 0 0 0

Riverside-San 

Bernardino-Ontario*

Riverside and San 

Bernardino 4,224,851 Mira Loma Van Buren Mira Loma Van Buren 2 8 0

Sacramento-Arden 

Arcade-Roseville*

El Dorado, Placer, 

Sacramento, and 

Yolo

2,149,127 Davis-UCD Campus Sacramento-DPM 2 9 0

Santa Rosa* Sonoma 483,878 Santa Rosa-5th St Santa Rosa-5th St 0 1 0

Vallejo-Fairfield* Solano 413,344 Vallejo Vallejo 0 1 0

Yuba City Sutter and Yuba 166,892 Yuba City-Almond Yuba City-Almond 0 1 0

1

The CFR does not specify that continuous PM2.5 monitors have to be Federal Equivalent Methods (FEMs); therefore, this assessment includes both continuous 

FEM and non-FEM PM2.5 monitors.

* Parts of these CBSAs are included in the geographical scope of this report, and parts are within the geographical scope of the reports being completed by the districts.

See Table 5a for the completed list of CBSAs in California. The numbers of active continuous PM2.5 monitors listed are for the entire CBSA (see below for site details).

^ The required number of continuous PM2.5 monitor is one-half (round up) the total number of required PM2.5 SLAMS sites in each CBSA 

(40 CFR 58 Appendix A Section 4.7.2).

^^The number of active continuous PM2.5 monitors listed for each CBSA include both FEM and non-FEM monitors.

N/A means that there is no continuous PM2.5 monitor in the CBSA.

Continuous PM2.5 sites for which are counted towards minimum monitoring requirements.

CBSA Site CBSA Site CBSA Site

Bakersfield Redding -- Auburn

Lebec Colfax

Mojave CBSA Site Elk Grove

Banning-Airport Folsom

CBSA Site Crestline Lincoln

Anahiem Elsinor Roseville

Burbank Mira Loma Sac-Del Paso

Glendora Riverside-Magnolia Sac-T St

Los Angeles Riverside-Rubidoux UC Davis

North Long Beach Upland

Reseda Winchester

Santa Clarita CBSA Site

CBSA Site CBSA Site

Chico-East

Gridley CBSA Site

Paradise

Santa Rosa

Vallejo-Fairfield Vallejo

Yuba City Yuba City-Almond

Los Angeles-Long 

Beach-Anahiem

Chico

Bakersfield

Riverside-San 

Bernardino-Ontario

SacramentoArden ArcadeRoseville

# of Active 

Continuous 

Monitors^^

Santa Rosa

# of Additional 

Continuous 

Monitors Needed

CBSA County(ies) Population 

(2010 Census)

Site with the Highest 

Annual Design Value

Site with the Highest 24-

hr Design Value

# of Required 

Continuous 

Monitors^
_______________________________________________________________________ 

62 Annual Monitoring Network Report for Twenty-three Districts in California

PM101

Minimum Montoring Requirements for PM10.

Bakersfield* Kern 839,361 99.6 Bakersfield-California 1-2 4 0

Chico Butte 220,000 55.6 Chico-East** 0 1 0

Los Angeles-Long BeachAnahiem* Los Angeles and Orange 12,828,837 80 Los Angeles-North Main 2-4 11 0

Redding Shasta 177,223 50 Anderson 0 3 0

Riverside-San BernardinoOntario*Riverside and San 

Bernardino 4,224,851 270.6 Indio 6-10 20 0

Sacramento-Arden ArcadeRoseville*El Dorado, Placer, 

Sacramento, and Yolo 2,149,127 76.5 Sacramento-Goldenland 2-4 12 0

Santa Rosa* Sonoma 483,878 35 Healdsburg 0-1 3 0

Vallejo-Fairfield* Solano 413,344 26 Vacaville 0-1 1 0

Yuba City Sutter and Yuba 166,892 60.8 Yuba City-Almond 0 1 0

1 For the purpose of this monitoring requirement, only PM10 FRM monitors with size selective inlets (SSI) are counted.

* Parts of these CBSAs are included in the geographical scope of this report, and parts are within the geographical scope of the reports being completed 

by the districts. See Table 5a for the completed list of CBSAs in California. The numbers of active PM10 monitors listed are for the entire CBSA (see below 

for site details).

**The Chico-East site was recently established on 4/2/2012.

PM10 FRM sites for which are counted towards minimum monitoring requirements.

CBSA Site CBSA Site CBSA Site

Bakersfield-California Banning-Airport Auburn

Canebrake Barstow Colfax

Oildale Crestline Lincoln

Ridgecrest Elsinore North Highlands

Fontana Roseville

CBSA Site Hesperia Sac-Branch

Anahiem Indio Sac-Del Paso

Azusa Lucerne Valley Sac-Goldenland

Burbank Mira Loma Sac-Health Dept

Glendora Norco Sac-T St

Lancaster Ontario West Sac

Los Angeles-North Main Palm Springs Woodland

Los Angeles-Westchester Perris

Mission Viejo Redlands CBSA Site

North Long Beach Riverside-Magnolia

Santa Clarita Riverside-Rubidoux

South Long Beach San Bernardino

Trona CBSA Site

CBSA Site Upland

Victorville

CBSA Site CBSA Site

Redding-Health Dept Healdsburg

Anderson Cloverdale

Shasta Lake Gunerneville

VallejoFairfield Vacaville

Yuba City Yuba CityAlmond

Los Angeles-Long BeachAnahiem

Redding

Riverside-San 

Bernardino-Ontario

Santa Rosa

Bakersfield

Chico Chico-East

SacramentoArden 

ArcadeRoseville

# of 

Required 

Monitors

# of Active 

Monitors

# of Additional 

Monitors 

Needed

CBSA County(ies) Population 

(2010 Census)

2012 Max Daily 

Concentration 

(ug/m3)

Max Concentration Site
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63 Annual Monitoring Network Report for Twenty-three Districts in California

APPENDIX C 

Supporting Documents included in the ANP 

(For example, EPA approval letters) 

1. March 7, 2013. U.S. EPA letter, approving the relocation of the Fresno 

NCore site. 

2. April 10, 2013. ARB letter, requesting for approval of the Chico site 

relocation. 

3. April 24, 2013. U.S. EPA letter, approving the termination of the ozone 

monitor at the Calexico-East site. 

4. June 5, 2013. ARB letter, requesting for approval of the seasonal ozone 

monitoring sites covered in this report. 

5. July 17, 2013. U.S. EPA letter, approving the seasonal ozone monitoring 

sites covered in this report. 












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 76 Annual Monitoring Network Report for Twenty-three Districts in California

  

APPENDIX D 

List of Abbreviations and Acronyms 

APCD Air Pollution Control District 

AQMD Air Quality Management District 

AQS Air Quality System 

ARB Air Resources Board 

CFR Code of Federal Regulations 

CBSA Core-Based Statistical Area 

FEM Federal equivalent method 

FRM Federal reference method 

MSA Metropolitan Statistical Area 

NAAQS National Ambient Air Quality Standard 

NO2 Nitrogen dioxide 

Pb Lead 

PM10 Particulate matter (0 to 10 microns aerodynamic diameter) 

PM2.5 Particulate matter (0 to 2.5 microns aerodynamic diameter) 

PQAO Primary quality assurance organization 

 

SIP State Implementation Plan 

SLAMS State and Local Air Monitoring Stations 

SO2 Sulfur dioxide 

U.S. EPA United States Environmental Protection Agency