2010 Annual Monitoring 

Network Report 

for 

Small Districts in California 

July 2010

2010 ANNUAL MONITORING NETWORK REPORT 

FOR

SMALL DISTRICTS IN CALIFORNIA 

Planning and Technical Support Division 

Air Quality Data Branch 

California Air Resources Board 

July 2010 

_______________________________________________________________________ 

iii 2010 Annual Monitoring Network Report for Small Districts in California

Table of Contents 

Section 1. Purposes, scope, and organization of report......................... 1 

Section 2. General information about the monitoring network................. 5 

Section 3. Purposes served by the monitors........................................ 6 

Section 4. Additional information about the monitors............................. 13 

Section 5. Monitoring required by the U.S. EPA.................................... 18 

Section 6. Required quality assurance of the monitoring program............ 21 

Section 7. Operating schedules.......................................................... 25 

Section 8. Additional information on PM2.5 monitors............................. 28 

8.1 Suitability for comparison to the annual PM2.5 NAAQS........... 28 

8.2 Review of changes to PM2.5 network.................................. 28 

Section 9. Proposed and recently implemented monitoring site changes... 30 

Section 10. Access to more information about the network................... 32 

Appendix A. Regulatory language of 40 CFR 58.10.............................. 37 

Appendix B. Acronyms................................................................... 41 
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iv 2010 Annual Monitoring Network Report for Small Districts in California

List of Tables 

Table 1. Agencies Drafting Annual Network Plans................................ 2 

Table 2. Location of Information Required for Annual Network Plan.......... 4 

Table 3. Monitoring Purposes............................................................. 9 

Table 4. Additional Information About the Monitors............................... 14 

Table 5. Numbers of Required and Existing Sites by Metropolitan 

 Statistical Area (MSA)........................................................ 20 

Table 6. Current PM2.5 Operating Schedules..................................... 26 

Table 7. Planned Changes to PM2.5 Monitors..................................... 31 

List of Figure 

Figure 1. Counties and Monitoring Sites in this Report.......................... 3 
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1 2010 Annual Monitoring Network Report for Small Districts in California

Section 1. Purposes, scope, and organization of report 

In California, there are more than 250 locations where the ambient air quality is 

routinely measured for gaseous and particulate air pollutants. The measured 

data form a backbone for air quality management programs, provide the public 

with information on the status of the air quality and the progress in improving air 

quality, and are used by health researchers, business interests, environmental 

groups, and others. 

This report describes the network of ambient air quality monitors in parts of 

California. The report meets requirements for an annual network plan as listed in 

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

The language of 40 CFR 58.10 is included in Appendix A. The regulations 

require that the report be submitted to the U.S. Environmental Protection Agency 

(U.S. EPA) by July 1 of each year. 

Fourteen local air agencies in California that operate monitoring sites are 

reporting separately on the ambient monitoring within their jurisdictions. The 

geographical scope of this report consists of 21 counties or portions of counties 

with ambient monitoring sites for which the local air agencies are not drafting a 

separate report. Table 1 lists the local agencies that are drafting their own 

reports and those whose monitoring is included in this report. Figure 1 shows the 

areas covered by this report and the locations of the included monitoring sites. 

Table 2 lists the elements required in 40 CFR 58.10 to be in the network plan. 

Also listed in Table 2 is the location(s) within the report that includes information 

on each required element. Table 3 in Section 3 of the report lists each of the 

monitoring sites covered in this report together with its purpose. Table 4 in 

Section 4 of the report lists additional information about the same monitors, such 

as monitoring objective and spatial scale information. Table 5 in Section 5 of the 

report lists the numbers of required and existing monitoring sites by metropolitan 

statistical areas (MSA) that are covered in the geographical scope of this report. 

Table 6 in Section 7 of the report lists the current operating schedules of the 

PM2.5 monitors at PM2.5 monitoring sites that are covered in this report. 

While this report covers monitoring in limited parts of California, the California Air 

Resources Board (ARB) produces other publicly available information on air 

quality monitoring throughout all of California. Section 10 of this report lists 

references and web links to this information. 

As required by the regulations, this report includes monitors which are federal 

reference methods (FRM) or federal equivalent methods (FEM) and operated by 

air agencies. While the CFR also requires reporting of approved regional 

methods (ARM), no ARMs are in operation in California at this time, and there 

are no plans to operate monitors of this type in California. The terms FRM and 

FEM denote monitoring instruments that are permitted by federal regulation to 

measure concentrations of pollutants for comparison to the ambient air quality 
_______________________________________________________________________ 

2 2010 Annual Monitoring Network Report for Small Districts in California

standards. An ARM is a state- or locally-approved device that serves the same 

purpose. The areas covered in the report are not subject to U.S. EPA 

requirements for photochemical assessment monitoring stations (PAMS) and for 

NCore monitoring. 

Given the interest in PM2.5, this report includes information on PM2.5 continuous 

monitoring and PM2.5 speciation monitoring in addition to FRMs utilized by a 

number of agencies. 

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. 

 Antelope Valley APCD* Amador County APCD

 Great Basin Unified APCD Butte County AQMD

 Imperial County APCD Calaveras County APCD

 Mojave Desert AQMD Colusa County APCD

 Monterey Bay Unified APCD El Dorado County AQMD

 North Coast Unified AQMD Feather River AQMD

 Sacramento Metropolitan AQMD Glenn County APCD

 San Diego County APCD Kern County APCD

 San Francisco Bay Area AQMD Lake County AQMD

 San Joaquin Valley Unified APCD Lassen County APCD

 San Luis Obispo County APCD Mariposa County APCD

 Santa Barbara County APCD Mendocino County AQMD

 South Coast AQMD Modoc County APCD

 Ventura County APCD 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

*The monitoring in the Antelope Valley APCD will be discussed in the Mojave

Desert AQMD's monitoring network plan.

Notes: APCD stands for Air Pollution Control District

 AQMD stands for Air Quality Management District

Air districts drafting Air districts that are 

Table 1

Agencies Drafting Annual Network Plans

their own Annual Network Plans included in this ARB report
_______________________________________________________________________ 

3 2010 Annual Monitoring Network Report for Small Districts in California

 
_______________________________________________________________________ 

4 2010 Annual Monitoring Network Report for Small Districts in California

Monitoring purpose information

Evidence that siting and operation criteria are met

Appendix A

Appendix C

Appendix D

Appendix E

Air Quality System Site Identification Number

(AQS Site ID)

Location of sites

Street address

Geographic coordinates

Sampling and analysis methods of monitors

Operating schedules for monitors

Proposals to move/remove stations

Monitoring objectives and spatial scale

Sites suitable or not for comparison to the annual

PM2.5 National Ambient Air Quality Standard (NAAQS)

Metropolitan, core-based, combined, or other 

statistical area information 

(MSA, CBSA, CSA, and micropolitan)

Review of changes to PM2.5 Network

Table 2

Elements required by 40 CFR 58.10 Location in Annual Network Plan

Location of Information Required for Annual Network Plan

Section 3

Section 6

Section 6

Section 5

Section 6

Section 3, Table 3

Section 4, Table 4

Section 3, Table 3

Section 4, Table 4

Section 4, Table 4

Section 7

Section 9

Section 4, Table 4

Section 8.1

Section 3, Table 3

Section 8.2

Section 4, Table 4
_______________________________________________________________________ 

5 2010 Annual Monitoring Network Report for Small Districts in California

Section 2. General information about the monitoring network 

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. The monitoring 

network needs to be large 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 Calexico. Some of the 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. 

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

most important of these are ozone (O3), particulate matter with diameter 2.5 

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

(PM10), and a number of toxic compounds. Monitoring for meteorological 

parameters is also conducted at a number of sites. Data for all of the pollutants 

is needed to better understand and inform the public of 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 purposes in the next section of this 

report. 

A fundamental purpose of monitoring is to distinguish between areas where 

pollutant levels exceed the ambient air quality standards and areas where they 

do not. Health-based ambient air standards are set at levels of pollutant 

concentration that result in adverse impacts to human health. Evidence of a 

standard being exceeded 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. Section 10 of this report includes references 

to more information on California monitoring networks. 
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6 2010 Annual Monitoring Network Report for Small Districts in California

Section 3. Purposes served by the monitors 

The data from a network of air quality monitors serves many purposes that 

benefit a number of groups of society in different ways. The data are useful to 

health researchers, the general public, regulatory agency staff, 

environmentalists, business interests, and others. For example, the 

measurements of pollutant concentrations that come from the air quality monitors 

in the network are used: to determine compliance with ambient air quality 

standards; as the basis of daily reports to the public in newspapers and on TV; 

and in determining the levels of pollution above which there are significant 

adverse health effects. Each monitor in the network serves at least one purpose 

and most of the monitors serve multiple purposes. 

By their nature, some of the purposes are met by a limited number of monitors, 

e.g., the purpose of monitoring for the highest concentrations of a pollutant in an 

area. Other purposes are general in nature, e.g., most monitors are useful for 

public reporting of the ambient air quality in the vicinity of the monitor and for 

providing spatial representation of air quality in the sub-regions of a larger region. 

And yet other purposes are quite specific, such as for a special study on health 

consequences or for modeling an episode of particularly bad air quality. 

Some purposes may, in one context, apply to almost all monitoring for a pollutant 

and in another context more selectively apply to a small subset of the monitors. 

Take the purpose of determining compliance with the ambient air quality 

standards. The State does this in order to determine if an area is in attainment or 

non-attainment of California Ambient Air Quality Standards. In this process of 

“State designations”, the data from all monitors in an area can be looked at but 

only the data from a small number of monitors with the highest concentrations 

will drive the determination of the designation for the area. So as used in this 

report, a smaller number of monitors are given the “State designation” purpose. 

A list of purposes along with short descriptions is included below. After that, a 

table (Table 3) lists the purposes served by each monitor included in the scope of 

this report, and for which official data for 2009 was reported. In Table 3, codes 

identify the purpose of each monitor. These codes are defined at the end of 

Table 3. Note that although the general purposes apply to most of the monitors, 

the code for general purposes only appears if those purposes are the most 

important purposes for the monitor. Also, no effort was made to indicate whether 

any monitors are serving ad hoc purposes at this time. Such conditions can 

change quickly. 

Note that Table 4 in Section 4 of this report lists the “monitoring objectives” of the 

monitors, and that this is different than how the term “monitoring purposes” is 

used in this report. The CFR requires that the monitoring objectives be listed in 

this annual network report. These monitoring objectives are the federal 

monitoring objectives as defined by the U.S. EPA. These do not include a 
_______________________________________________________________________ 

7 2010 Annual Monitoring Network Report for Small Districts in California

number of additional State and local monitoring objectives. This section of the 

report lists the broader purposes served by the monitors, including the State, 

local, and federal purposes for monitoring. The federal monitoring objectives are 

a subset of this broader list of monitoring purposes. 

Also listed in Table 3 are the locations of the monitors, including the metropolitan 

and micropolitan statistical areas in which the monitors are located. Certain 

requirements in 40 CFR 58 are based on metropolitan statistical areas (MSAs). 

MSAs are part of a classification of geographical regions developed by the U.S. 

Office of Management and Budget (OMB). An MSA may include one or more 

counties. However, not all counties are within an MSA. In Table 3, the 

appropriate metropolitan or micropolitan statistical area is listed after the county 

name. 

List of purposes with descriptions

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. 

Background Level monitoring is used to determine general background levels of 

air pollutants. Background concentrations vary between different air pollutants. 

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 air quality health standards. During the 

State area designation process, the data from all monitors in an area can be 

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. 

High Concentration monitoring is done at sites to determine the highest 

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

monitoring network may have multiple high concentration sites, due, for example, 

to varying meteorology year to year. This is a purpose listed by the U.S. EPA. 

Pollutant Transport is the movement of pollutants between air basins or regions. 

Transport monitoring is used to assess and mitigate pollution in upwind areas 

when transported pollutant affects neighboring downwind areas. Also, transport 

monitoring is used to determine the extent of regional pollutant transport among 

populated areas and to agricultural and wildland areas. 
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8 2010 Annual Monitoring Network Report for Small Districts in California

Population Exposure monitoring is done to represent the air pollutant 

concentrations a populated area is exposed to. 

Public Reporting means providing air quality data to the general public in a timely 

manner. Data can be presented in a number of ways including newspapers and 

TV, internet web pages, air quality maps, and hardcopies. 

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. 

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

or source categories of air quality emissions on ambient air quality. The air 

pollutant sources may be stationary or mobile. 

State Area Designation is the process used to determine compliance with the 

State ambient air quality standards for a particular pollutant. The State does this 

by monitoring the ambient air quality of an area and, using the monitors with the 

highest concentrations of a particular pollutant, determining if the area is in 

attainment or non-attainment of the California Ambient Air Quality Standards, as 

already described in the discussion of Expected High Concentration Monitoring. 

State Implementation Plan (SIP) Maintenance Requirement is part of the 

comprehensive SIP strategy designed to attain federal air quality standards as 

quickly as possible through a combination of technologically feasible, costeffective, and far reaching measures. The SIP is a plan prepared by States and 

submitted to the U.S. EPA describing how each area will attain and maintain 

NAAQS. Once an area attains a NAAQS, 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. 

Welfare Effects monitoring is use to measure air pollution impacts on visibility, 

vegetation damage, or other welfare-based impacts. 
_______________________________________________________________________ 

9 2010 Annual Monitoring Network Report for Small Districts in California

Station/Address OZONE CO NO2 SO2 PM2.5* PM10*

LAKE COUNTY AIR BASIN

Lake County Clearlake **

Middletown-Anderson Springs Road Gnrl/GAMP

11270 Anderson Springs Road, Middletown StateD

Glenbrook-High Valley Road Gnrl/GAMP

8276 High Valley Road, Cobb StateD

Lakeport-Lakeport Blvd Gnrl/StateD Gnrl/StateD Gnrl/StateD

905 Lakeport Blvd, Lakeport

LAKE TAHOE AIR BASIN

El Dorado County Sacramento-Arden-Arcade-Roseville MSA

South Lake Tahoe-Airport StateD/Trans

1901 Airport Road, South Lake Tahoe

South Lake Tahoe-Sandy Way CONT

3337 Sandy Way, South Lake Tahoe

MOJAVE DESERT AIR BASIN

Kern County Bakersfield MSA

Canebrake RConc

3147 Highway 178, Canebrake

Mojave-923 Poole Street HConc/StateD StateD/RConc StateD

923 Poole Street, Mojave SIPMain/Trans

Ridgecrest-100 West California Avenue StateD/RConc StateD/RConc

100 West California Avenue, Ridgecrest SIPMain

MOUNTAIN COUNTIES AIR BASIN

Amador County N/A

Jackson-Clinton Road Gnrl/StateD

201 Clinton Road, Jackson Trans

Calaveras County N/A

San Andreas-Gold Strike Road Gnrl/StateD Gnrl Gnrl

501 Gold Strike Road, San Andreas Trans

El Dorado County Sacramento-Arden-Arcade-Roseville MSA

Cool-Highway 193 EHConc

1400 American River Trail, Cool

Echo Summit Hconc/Trans

21200 Highway 50-Little Norway

Placerville-Gold Nugget Way StateD/Trans Gnrl/StateD

3111 Gold Nugget Way, Placerville

Mariposa County N/A

Jerseydale-6440 Jerseydale StateD/Trans

6440 Jerseydale Road, Jerseydale

Yosemite National Park-Turtleback Dome StateD/HConc Gnrl Gnrl

Trans

Yosemite Village-Visitor Center CONT Gnrl/StateD

Nevada County Truckee-Grass Valley

Grass Valley-Litton Building HConc/Trans SPM HConc

200 Litton Drive, Grass Valley StateD/Gnrl CONT

Trends

Truckee-Fire Station HConc

10049 Donner Pass Road, Truckee CONT

White Cloud Mountain Bkgnd

26533 State Highway 20, White Cloud Mountain

060571001

060570007

060170012

060570005

060170010

060430006

060430003

060431001

060170020

060170013

060290017

060050002

060290015

060170011

060290011

Monitoring Purposes

(Monitors reporting data in 2009)

Table 3

AQS Site #

060333001

060333010

060333011

060090001
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10 2010 Annual Monitoring Network Report for Small Districts in California

Station/Address OZONE CO NO2 SO2 PM2.5* PM10*

Placer County Sacramento-Arden-Arcade-Roseville MSA

Colfax-City Hall Gnrl/StateD

33 South Main Street, Colfax

Plumas County N/A

Chester-222 1st Avenue CONT

222 1st Avenue, Chester

Portola-161 Nevada Street HConc

161 Nevada Street, Portola CONT/SPEC

Quincy-N Church Street HConc

267 North Church Street, Quincy CONT

Tuolumne County Phoenix Lake-Cedar Ridge

Sonora-Barretta Street Gnrl/StateD

251 South Barretta Street, Sonora

NORTH COAST AIR BASIN

Mendocino County Ukiah

Fort Bragg-North Franklin Street Gnrl/StateD

416 North Franklin Street, Fort Bragg AgBn/ResBn

CONT

Ukiah-County Library Gnrl/StateD StateD

105 North Main Street, Ukiah CONT-FEM AgBn/ResBn

Ukiah-East Gobbi Street Trans/StateD Gnrl Gnrl

306 East Gobbi Street, Ukiah

Willits-899 South Main Street Trans Gnrl Gnrl

899 South Main Street, Willits

Willits-Firehouse CONT-FEM StateD

74 East Commercial Street, Willits AgBn/ResBn

Sonoma County Santa Rosa-Petaluma MSA

Cloverdale AgBn/ResBn

100 Washington Street, Colverdale CONT***

Guerneville-Church and 1st AgBn/ResBn

16255 1st Street, Guerneville CONT***

Healdsburg-133 Matheson Street Gnrl

133 Matheson Street, Healdsburg AgBn/ResBn

CONT***

Healdsburg-Municipal Airport Gnrl/StateD

200a Heidelberg Way, Healdsburg

NORTHEAST PLATEAU AIR BASIN

Siskiyou County N/A

Lava Beds National Monument Gnrl/StateD

P.O. Box 867, Lava Beds AgBn

Mount Shasta-N Old Stage Road Gnrl/AgBn

3 North Old Stage Road, Mount Shasta

Yreka-Foothill Drive Gnrl/StateD Gnrl Gnrl/StateD

528 Foothill Drive, Yreka Trans AgBn

SACRAMENTO VALLEY AIR BASIN

Butte County Chico MSA

Chico-Manzanita Avenue Gnrl/StateD Gnrl Gnrl Gnrl/StateD Grnl/StateD

468 Manzanita Avenue, Chico AgBn CONT/SPEC AgBn

Gridley-Cowee Avenue CONT

608 Cowee Avenue, Gridley

Paradise-4405 Airport Road Gnrl/StateD

4405 Airport Road, Paradise AgBn

Paradise-Fire Station #1 CONT

767 Birch Street, Paradise

060970001

060930004

060930005

060973002

060970002

060971003

060450009

060452001

060070002

060074001

060932001

060070007

060072001

060450008

060450006

060610004

060631007

060631009

Table 3 (Cont.)

Monitoring Purposes

(Monitors reporting data in 2009)

AQS Site #

060450002

060631006

061090005
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11 2010 Annual Monitoring Network Report for Small Districts in California

Station/Address OZONE CO NO2 SO2 PM2.5* PM10*

Colusa County N/A

Colusa-Sunrise Blvd Gnrl/AgBn Gnrl Gnrl/StateD

100 Sunrise Blvd, Colusa CONT AgBn

Glenn County N/A

Willows-E Laurel Street Gnrl/StateD CONT StateD/AgBn

720 N Colusa Street, Willows AgBn

Placer County Sacramento-Arden-Arcade-Roseville MSA

Auburn-Dewitt-C Avenue StateD

108 C Avenue, Auburn

Roseville-N Sunrise Blvd StateD/AgBn Gnrl Gnrl/StateD StateD/AgBn

151 N Sunrise Blvd, Roseville CONT

Shasta County Redding MSA

Anderson-North Street StateD CONT*** StateD

2220 North Street, Anderson

Lassen Volcanic Natl Park-Manzanita Lake Gnrl

Redding-Health Department Roof Gnrl/StateD Gnrl Gnrl/StateD

2630 Hospital Lane, Redding

Shasta Lake-4066 La Mesa Avenue Gnrl

4066 La Mesa Avenue, Shasta Lake

Solano County Vallejo-Fairfield MSA

Vacaville-Merchant Street Gnrl

650 Merchant Street, Vacaville

Vacaville-Ulatis Drive StateD/Trans CONT***

2012 Ulatis Drive, Vacaville

Sutter County Yuba City MSA

Sutter Buttes-S Buttes HConc/Trans

StateD/AgBn

Yuba City-Almond Street Gnrl/StateD Gnrl Gnrl Gnrl/StateD

773 Almond Street, Yuba City AgBn CONT

Tehama County Red Bluff

Red Bluff-Oak Street Gnrl/StateD

502 Oak Street, Red Bluff

Red Bluff-Messer Drive Gnrl/StateD

700 Messer Drive, Red Bluff

Tuscan Butte Gnrl/StateD

Yolo County Sacramento-Arden-Arcade-Roseville MSA

Davis-UCD Campus AgBn/StateD Gnrl CONT StateD

West Sacramento-15th Street StateD

132 15th Street, West Sacramento

Woodland-Gibson Road StateD Gnrl/StateD AgBn/StateD

41929 E Gibson Road, Woodland CONT***

Lead monitors are not included in this list because there is no lead monitoring in these areas.

* CONT, CONT-FEM, or SPEC in a PM column denotes that a continuous (CONT) PM or speciation (SPEC) PM monitor is located at the site.

CONT-FEM stands for a continuous federal equivalent method. Continuous PM montioring provides realtime hourly concentration values. 

This is useful for public reporting, better understanding of episodes of high PM concentrations, identification of sources of pollutants, possible allowance

for less frequent filter sampling, etc. Monitoring purposes for continuous PM monitors are not listed.

** After a county name, the table lists the U.S. Office of Management and Budget's metropolitan (MSA) or micropolitan statistical area that

includes the county.

*** Continuous PM monitors for which the data were not being submitted to ARB or EPA in 2009. 

060610006

060890007

060111002

060210003

060610002

Monitoring Purposes

(Monitors reporting data in 2009)

Table 3 (Cont.)

AQS Site #

060893003

060890004

060890008

060953001

060953003

061010004

061132001

061131003

061010003

061030005

061030002

061130004

061030004
_______________________________________________________________________ 

12 2010 Annual Monitoring Network Report for Small Districts in California

HConc High concentrations

RConc Representative concentrations

Sourc Source impact

Bkgnd Background levels

Trans Pollutant transport

Welfr Welfare effects

EHConc Monitoring at expected high concentration sites relative to California

 Ambient Air Quality Standards

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

SPM Special Purpose Monitoring

The following purposes apply in a general sense to monitors throughout the network. For these, 

we use the code "Gnrl' in the table above. We list this code for a monitor when these purposes 

are some of the predominant purposes for the monitor.

Gnrl Population exposure/population representation

 Spatial representation/spatial coverage (geographical representation)

 Public reporting

Most monitors are also considered to be of potential use for purposes such as: evaluation of 

emissions inventories, model validation, and source/pollutant relationships. These purposes 

are not separately listed in the above table.

Table 3 (cont.)

Codes for Monitoring Purposes

Federal monitoring purposes

State and local purposes (includes the purposes above plus these below)
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13 2010 Annual Monitoring Network Report for Small Districts in California

Section 4. Additional information about the monitors 

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

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

monitoring. Table 4 lists the monitoring objectives, spatial scales, and sampling 

methods of the monitors that are covered in this report. Also included in Table 4 

are the geographical coordinates of the monitoring sites. 

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

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

method for the gaseous monitors and continuous PM monitors. Also, for the 

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

As already pointed out in Section 3, the “monitoring objectives” listed below in 

Table 4 are not the same as the “monitoring purposes” listed in Table 3 in 

Section 3. The monitoring objectives used for Table 4 are the federal monitoring 

objectives as defined by the U.S. EPA. At the end of Table 4, the codes used for 

the monitoring objectives, spatial scales, and sampling methods are defined. 
_______________________________________________________________________ 

14 2010 Annual Monitoring Network Report for Small Districts in California

Station/Coordinates OZONE CO NO2 SO2 PM2.5* PM10*

LAKE COUNTY AIR BASIN

Lake County Clearlake **

Middletown-Anderson Springs Road HC/NS/

38.7744, -122.6994 SCH, XG

Glenbrook-High Valley Road HC/NS/

38.8502, -122.7361 SCH, XG

Lakeport-Lakeport Blvd HC/US/UV HC/NS/SCH HC/US/SCH

39.0330, -122.9219

LAKE TAHOE AIR BASIN

El Dorado County Sacramento-Arden-Arcade-Roseville MSA

South Lake Tahoe-Airport HC,TR/RS/

38.9102, -119.9952 UV

South Lake Tahoe-Sandy Way CONT

38.9450, -119.9703

MOJAVE DESERT AIR BASIN

Kern County Bakersfield MSA

Canebrake BL/RS/SI

35.72778, -118.1393

Mojave-923 Poole Street HC, TR/RS/ HC/NS/SQ HC/RS/SI

35.0503, -118.1478 UV

Ridgecrest-100 West California Avenue RC/NS/SI HC/NS/SI

35.6211, -117.6731

MOUNTAIN COUNTIES AIR BASIN

Amador County N/A

Jackson-Clinton Road HC,TR/US/

38.3427, -120.7644 UV

Calaveras County N/A

San Andreas-Gold Strike Road HC,TR/RS/ RC/NS/SCH RC/RS/SI

38.2019, -120.6802 UV

El Dorado County Sacramento-Arden-Arcade-Roseville MSA

Cool-Highway 193 HC,TR/RS/

38.8906, -121.0000 UV

Echo Summit HC,TR/RS/

38.8117, -120.0331 UV

Placerville-Gold Nugget Way HC,TR/RS/ HC/RS/SI

38.7247, -120.8219 UV

Mariposa County N/A

Jerseydale-6440 Jerseydale HC,TR/RS/

37.5466, -119.8416 UV

Yosemite National Park-Turtleback Dome HC,TR/RS/ BL/US/IR BL/US/CL

37.7133, -119.7058 UV

Yosemite Village-Visitor Center CONT HC/NS/SI

37.7486, -119.5869

Nevada County Truckee-Grass Valley

Grass Valley-Litton Building RC/US/UV RC/NS/CL RC/NS/SCH

39.2336, -121.0555 CONT

Truckee-Fire Station HC/NS/SQ

39.3274, -120.1847 CONT

White Cloud Mountain BL/RS/UV

39.3181, -120.8456

060570007

060571001

(Monitoring Objective/Spatial Scale/Sampling Method)

060170010

060430006

060430003

060431001

060430006

060170020

060170013

060050002

060170011

060290015

060290017

060290011

Additional Information About the Monitors

(Monitors reporting data in 2009)

Table 4

AQS Site #

060333001

060333010

060333011

060090001

060170012
_______________________________________________________________________ 

15 2010 Annual Monitoring Network Report for Small Districts in California

Station/Coordinates OZONE CO NO2 SO2 PM2.5* PM10*

Placer County Sacramento-Arden-Arcade-Roseville MSA

Colfax-City Hall HC/US/UV

39.0997, -120.9541

Plumas County N/A

Chester-222 1st Avenue CONT

40.3097, -121.2277

Portola-161 Nevada Street HC/NS/SQ

39.8083, -120.4717 CONT/SPEC

Quincy-N Church Street HC/NS/SQ

39.9397, -120.9441 CONT

Tuolumne County Phoenix Lake-Cedar Ridge

Sonora-Barretta Street HC/NS/UV

37.9819, -120.3786

NORTH COAST AIR BASIN

Mendocino County Ukiah

Fort Bragg-North Franklin Street HC/NS/SI

39.4458, -123.8044 CONT

Ukiah-County Library HC/NS/SCH HC/NS/SI

39.1511, -123.2066 CONT-FEM

Ukiah-East Gobbi Street HC,TR/US/ RC/NS/IR RC/US/CL

39.1447, -123.2002 UV

Willits-899 South Main Street TR/US/UV RC/NS/IR RC/NS/CL

39.4044, -123.3497

Willits-Firehouse CONT-FEM HC/NS/SI

39.4130, -123.3536

Sonoma County Santa Rosa-Petaluma MSA

Cloverdale RC/NS/SI

38.8047, -123.0177 CONT***

Guerneville-Church and 1st RC/NS/SI

38.5016, -122.9977 CONT***

Healdsburg-133 Matheson Street RC/NS/SI

38.6111, -122.8686 CONT***

Healdsburg-Municipal Airport RC/US/UV

38.6536, -122.9005

NORTHEAST PLATEAU AIR BASIN

Siskiyou County N/A

Lava Beds National Monument HC/US/SI

41.7117, --121.5067

Mount Shasta-N Old Stage Road RC/NS/SI

41.3089, -122.3300

Yreka-Foothill Drive HC,TR/NS/UV HC/NS/SQ HC/NS/SI

41.7267, -122.6336

SACRAMENTO VALLEY AIR BASIN

Butte County Chico MSA

Chico-Manzanita Avenue HC/US/UV RC/NS/IR RC/NS/CL HC/NS/SCH HC/NS/SI

39.7575, -121.8422 CONT/SPEC

Gridley-Cowee Avenue CONT

39.3272, -121.6686

Paradise-4405 Airport Road HC/RS/UV

39.7141, -121.6177

Paradise-Fire Station #1 CONT

39.7538, -121.6244

060970001

060930004

060930005

060973002

060970002

060971003

060450009

060452001

060070002

060074001

060932001

060070007

060072001

060450008

060450006

060631007

060610004

Table 4 (Cont.)

Additional Information About the Monitors

(Monitors reporting data in 2009)

AQS Site #

060450002

061090005

060631009

060631006
_______________________________________________________________________ 

16 2010 Annual Monitoring Network Report for Small Districts in California

Station/Coordinates OZONE CO NO2 SO2 PM2.5* PM10*

Colusa County N/A

Colusa-Sunrise Blvd RC/RS/UV HC/NS/SQ HC/RS/SI

39.1888, -121.9980 CONT

Glenn County N/A

Willows-E Laurel Street HC/US/UV CONT HC/RS/SI

39.5172, -122.1897

Placer County Sacramento-Arden-Arcade-Roseville MSA

Auburn-Dewitt-C Avenue HC/US/UV

38.9394, -121.1055

Roseville-N Sunrise Blvd HC/US/UV RC/NS/CL RC/NS/SCH HC/US/SI

38.7461, -121.2647 CONT

Shasta County Redding MSA

Anderson-North Street HC/NS/UV CONT*** HC/NS/SI

40.4531, -122.2986

Lassen Volcanic Natl Park-Manzanita Lake RC/RS/UV

40.5372, -121.5764

Redding-Health Department Roof HC/NS/UV HC/NS/SCH HC/NS/SI

40.5514, -122.3808

Shasta Lake-4066 La Mesa Avenue RC/RS/SI

40.6775, -122.3733

Solano County Vallejo-Fairfield MSA

Vacaville-Merchant Street RC/US/SI

38.3516, -121.9933

Vacaville-Ulatis Drive HC,TR/US/UV CONT***

38.3583, -121.9500

Sutter County Yuba City MSA

Sutter Buttes-S Buttes HC,TR/RS/UV

39.1583, -121.7500

Yuba City-Almond Street HC/US/UV RC/NS/CL HC/NS/SCH HC/NS/SI

39.1388, -121.6191 CONT

Tehama County Red Bluff

Red Bluff-Oak Street HC/US/UV

40.1749, -122.2366

Red Bluff-Messer Drive HC/NS/SI

40.1638, -122.2213

Tuscan Butte HC/RS/UV

40.2622, -122.0928

Yolo County Sacramento-Arden-Arcade-Roseville MSA

Davis-UCD Campus HC/US/UV RC/NS/CL CONT RC/NS/SI

38.5352, -121.7730

West Sacramento-15th Street HC/NS/SI

38.5713, -121.5258

Woodland-Gibson Road HC/US/UV HC/NS/SQ HC/US/SI

38.6605, -121.7305 CONT***

Lead (Pb) monitors are not included in this list because there is no lead monitoring in these areas.

* CONT, CONT-FEM, or SPEC in a PM column denotes that a continuous (CONT) PM or speciation (SPEC) PM monitor is located at the site.

CONT-FEM stands for a continuous federal equivalent method. Continuous PM montioring provides realtime hourly concentration values. 

This is useful for public reporting, better understanding of episodes of high PM concentrations, identification of sources of pollutants, possible allowance

for less frequent filter sampling, etc. Monitoring objectives, spatial scales, and sampling methods are not listed for continuous PM monitors.

** After a county name, the table lists the U.S. Office of Management and Budget's metropolitan (MSA) or mircopolitan statistical area that

includes the county.

*** Continuous PM monitors for which the data were not being submitted to ARB or EPA in 2009. 

060610006

060890007

060610002

Additional Information About the Monitors

(Monitors reporting data in 2009)

Table 4 (Cont.)

AQS Site #

060111002

060210003

061132001

061131003

061010003

061030005

061030002

061130004

061030004

060953003

061010004

060893003

060890004

060890008

060953001
_______________________________________________________________________ 

17 2010 Annual Monitoring Network Report for Small Districts in California

BL Background levels

HC High concentrations

IM Source impact

RC Representative concentrations

TR Pollutant transport

MI Microscale

MS Middle scale

NS Neighborhood scale

RS Regional scale

US Urban 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

Sampling methods

Spatial scales

Federal monitoring objectives

Table 4 (cont.)

Codes for Monitoring Information
_______________________________________________________________________ 

18 2010 Annual Monitoring Network Report for Small Districts in California

Section 5. Monitoring required by the U.S. EPA 

U.S. EPA regulations specify the minimum number of sites at which State and 

local air agencies must deploy monitors. In practice, the State and local 

agencies find they need to deploy significantly more monitors. The additional 

monitors are needed to fulfill State and local purposes for monitoring that are in 

addition to the federal purposes. For example, because State air quality 

standards tend to be more stringent than national standards, some areas may 

need more monitors than those needed to show compliance with the national 

standards. Further, the public expects to be informed of the actual air quality 

conditions where they live and work. While this objective is not explicitly built into 

the federal regulatory requirements, state and local air agencies in California 

attempt to be responsive to public expectations. 

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

Part 58 of the CFR. For ozone, 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 other pollutants, no current monitoring is required by 

Appendix D unless an area exceeds or is close to exceeding a national ambient 

air quality standard, which is true for very few if any areas in the U.S. For 

purposes of the minimum requirements, the areas are defined by the MSAs 

developed by the OMB (more information on MSAs appears on page 8). Note 

that elsewhere in the CFR there are requirements for monitoring to indicate 

whether an area designated as attaining an air quality standard is maintaining the 

attainment status. This annual network plan is not required to address 

maintenance plan requirements, however, monitoring information on State and 

Local Air Monitoring Stations (SLAMS) and Special Purpose Monitoring (SPM) 

sites are included in other parts of this plan. 

For the parts of the State included in this report, Table 5 lists information on the 

number of existing O3, PM2.5, and PM10 monitors and the number required by 

Appendix D. In all cases, sufficient monitoring exists. The information is listed 

by MSA. The number of required monitors is based on the population of the 

MSA, taken from the 2000 U.S. Census, in combination with the degree to which 

air quality in the MSA is greater or less than the national air quality standards. 

Monitoring for carbon monoxide (CO), nitrogen dioxide (NO2), and sulfur dioxide 

(SO2) is not currently required anywhere in California in order to comply with the 

Appendix D requirements of 40 CFR 58. Ambient concentrations for these 

pollutants do not exceed the national air quality standards and do not trigger 

these requirements for monitoring. As required by a different part of 40 CFR 58 

that takes effect in 2013, new NO2 roadside monitoring in all of California’s urban 

areas will be required. These new near-road monitors will be addressed in the 

2012 network report. Even without federal requirements, dozens of sites in 

California monitor for CO, SO2, and NO2 already. 
_______________________________________________________________________ 

19 2010 Annual Monitoring Network Report for Small Districts in California

On December 23, 2009, the U.S. EPA proposed revisions to the ambient lead 

(Pb) monitoring requirements. If adopted, the revisions would impact both 

source-oriented monitors and population-oriented monitors. 

With respect to stationary lead sources, the U.S. EPA is proposing to reduce the 

threshold for monitoring from 1 ton per year to 0.5 tons per year. In California, 

the only stationary source meeting the 1 ton per year threshold is the Exide 

Technologies facility in Vernon, which is located in the Los Angeles County 

portion of the South Coast Air Basin. Exide Technologies is a lead-acid battery 

recycling facility, and the most reliable estimate puts lead emissions from this 

facility at about 2 tons per year. The South Coast Air Quality Management 

District currently maintains a network of three source-oriented lead monitors 

around Exide. If monitoring requirements are revised to include sources emitting 

0.5 tons per year or more of lead, then lead monitors will also be required at a 

number of general aviation airports. At the time this report was drafted, the areas 

covered in this plan will not be required to conduct source-oriented lead 

monitoring. 

The proposed revisions to the lead provisions also impact population-oriented 

monitoring. Under the initial rule, lead monitoring was required in each Core 

Based Statistical Area (CBSA) with a population of at least 500,000. There were 

11 qualifying CBSAs in California. Under the proposed revisions, instead of 

basing monitor location on population level, the U.S.EPA is proposing to require 

lead monitoring at all NCore sites. Currently, there are six candidate NCore sites 

in California. The NCore monitors must be operational by January 1, 2011. 

None of the NCore sites are located in areas covered by this network plan. 

A final rule on lead monitoring is expected in Spring 2010. For this reason, the 

ARB will address in more detail the lead monitoring requirements in next year’s 

annual network plan. 
_______________________________________________________________________ 

20 2010 Annual Monitoring Network Report for Small Districts in California

Required Existing Required Existing Required Existing Required Existing

FRM1 FRM Cont.2 Cont.

Bakersfield* 661,645 2 9 2 5 1 3 2 6

Chico 203,171 1 2 1 1 1 3 0 1

Redding 163,256 1 3 0 1 0 0 0 3

1,796,857 2 16 3 5 2 6 4 9

458,614 1 2 0 1 0 0 0 3

Vallejo-Fairfield* 394,542 2 4 1 1 1 2 0 2

Yuba City 139,149 1 2 1 1 1 1 0 1

Notes:

2006-2008 air quality data was used in determining the number of required sites.

Population is based on year 2000 Census data.

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

are within the geographical scope of the reports being completed by the districts.

The numbers of sites listed are for the entire MSA.

1 FRM: Federal Reference Method

2 Cont.: Refers to a continuous PM2.5 monitor, i.e., one that measures hourly data.

3 SSI: Size Selective Inlet. The SSI is an FRM for PM10.

Metropolitan 

Statistical Area 

(MSA)

Pop.

Sacramento-Arden 

Arcade-Roseville*

Santa RosaPetaluma*

Table 5

Numbers of Required and Existing Sites by Metropolitan Statistical Area (MSA)

(MSAs that include the small air districts included in this report)

Ozone PM2.5 PM10 (SSI)3
_______________________________________________________________________ 

21 2010 Annual Monitoring Network Report for Small Districts in California

Section 6. Required quality assurance of the monitoring program 

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

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. 

Annually, the Quality Assurance Section (QAS) of ARB conducts performance 

evaluations (audits) for each SO2, NO2, O3, and CO analyzer with National 

Institute of Standards and Technology (NIST) traceable gases. Each analyzer is 

audited at three levels using known concentrations of gases. Annual PM monitor 

flow rate audits are conducted with a BGI (Bob Gussman Incorporated) variable 

orifice mass flow meter, or TetraCal, which is certified against NIST traceable 

primary standards. Semi-annual flow rate audits for PM monitors are required. 

QAS conducts one annual PM flow rate audit and U.S. EPA Region 9 conducts 

the second PM flow rate audit. 

Laboratory audits for the toxics program are conducted using certified gases 

and/or materials. Meteorological audits are conducted with instruments that are 

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

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

As part of the annual audit at each air monitoring station, QAS conducts siting 

evaluations. Physical measurements and observations, including probe/sensor 

height above ground level, distance from trees, type of ground cover, residence 

time, obstructions to air flow, and distance to local sources, topography, vehicle 

counts, predominant wind direction, probe material, etc., are taken to determine 

compliance with 40 CFR Part 58, Appendix E requirements. 

QAS also ensures the quality of the data collected by the air monitoring sites 

operating in California through analysis of precision data submitted to the 

U.S. EPA’s ambient air quality database, the Air Quality System (AQS). 

Precision checks for gaseous/continuous samplers are performed once every 

two weeks. Precision checks for non-continuous, collocated particulate samplers 

are done at least every twelfth day. QAS staff analyzes the precision data in 

accordance with 40 CFR 58, Appendix A. 

In addition, air monitoring staff performs a one-point flow rate verification check 

once every month on high-volume PM10 and PM2.5 and twice a month on BAM10

and BAM2.5 automated analyzers. Air monitoring staff reviews these data and 

takes corrective action when the results exceed U.S. EPA’s requirements. 

Currently, the percent difference between the flow rate of the transfer standard 

and corresponding flow rate measured by the analyzer are not used to assess 

the bias of the monitoring data in accordance with 40 CFR Part 58, 

Appendix A, 3.2.3. Staff is in the process of incorporating these data to measure 

bias and meet Appendix A requirements. 
_______________________________________________________________________ 

22 2010 Annual Monitoring Network Report for Small Districts in California

QAS also conducts system audits to determine if 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 Clean Air Act and the California 

Clean Air Act. 

Information about each air monitoring station audited by QAS is available at 

http://www.arb.ca.gov/qaweb/site.php. This web page includes maps of each 

site, latitude and longitude coordinates as determined by GPS, site photos, 

precision and accuracy data, and a detailed site survey of the physical 

parameters and conditions at each site. This site also includes an area for 

district precision and accuracy reports. These reports are available on a limited 

basis to district staff. 

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

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

The CFR contains separate collocation requirements for PM2.5, PM10, and Pb. 

The requirements are to be met for each primary quality assurance organization 

(PQAO). Five PQAOs exist in California, one each for the San Francisco Bay 

Area AQMD, San Diego County APCD, South Coast AQMD, and Great Basin 

Unified APCD, and one for the remainder of the State that is called the ARB 

PQAO. 

For PM2.5, the CFR requires that for each PM2.5 federal reference method (FRM) 

monitoring method, 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 type. One type of sampler is the 

Rupprecht & Patashnick (R&P) PM2.5 sequential air sampler. For this type of 

sampler, the collocation requirement is met. 

The PQAO also has R&P non-sequential samplers deployed. Given the 16 

existing sites having this type of sampler, two of these sites are required to have 

a collocation sampler. Three of the sites already have collocation samplers. For 

this type of sampler, the collocation requirement is also met. 

The third type of PM2.5 FRM sampler is the Graseby Anderson PM2.5 sequential 

sampler. Within the ARB PQAO, six existing sites operate this sampler type, of 

which five sites are found in the San Joaquin Valley Air Pollution Control District 

(SJVAPCD). The SJVAPCD plans to phase out these samplers within their own 

network. Currently, there is no collocation site for this type of sampler, and one 

collocation site is required. The ARB is coordinating with the SJVAPCD to meet 

this requirement. 
_______________________________________________________________________ 

23 2010 Annual Monitoring Network Report for Small Districts in California

The CFR also requires that 15% of the sites with PM2.5 federal equivalent method 

(FEM) monitors be collocated, but that the first collocation monitor be an FRM, 

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

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

have this sampler type in ARB’s PQAO. The first collocation requirement must 

be between an FEM/FRM; three sites of this type currently exist in ARB’s PQAO. 

A collocation site between an FEM/FEM will not be needed until there are at least 

10 monitoring sites of this sampler type in ARB’s PQAO. For this type of 

sampler, the collocation requirement is also met. 

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 

requires 80% of the collocated monitors to be within + 20% of the applicable 

National Ambient Air Quality Standard (NAAQS), focusing on achieving this was 

deemed to result in too much clustering of the collocated monitors in too few of 

the factors needing representation. 

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

collocated samplers. However, the CFR language is much less specific as to 

what is required to meet the requirements. A U.S. EPA guidance document 

provides needed clarification. Agencies in the ARB PQAO deploy two types of 

PM10 FRM samplers that require appropriate collocation. Both are filter-based 

samplers that use size selective inlets and high flow rates. One type uses a 

volumetric flow controller (VFC) and the other type uses a mass flow controller 

(MFC). 

Given the 70 sites that have the PM10 VFC type of sampler in the ARB PQAO, 10 

of the sites will need to have collocation samplers of this same type. Six of the 

sites have collocated samplers now, so four more are required. The ARB will 

add collocation samplers to its sites over the next year or so, in conjunction with 

other changes in the PM10 FRM network, so that the collocation requirement will 

be met. 

As for the other type of PM10 FRM sampler, i.e., the MFC type, three sites have 

this type of sampler in the ARB PQAO. One of those sites already has a 

collocated sampler, so the collocation requirement is met. 

On December 23, 2009, the U.S. EPA proposed revisions to the ambient lead 

(Pb) monitoring requirements. If adopted, the revisions would impact both 

source-oriented monitors and population-oriented monitors. A final rule on lead 
_______________________________________________________________________ 

24 2010 Annual Monitoring Network Report for Small Districts in California

monitoring is expected in spring 2010. At the time this plan was drafted, no 

source-oriented lead monitoring is required in the areas covered in this plan. 

Moreover, it is unclear if the revised proposal for population-oriented lead 

monitoring at NCore sites will be approved; therefore, the collocation 

requirements for population-oriented Pb monitoring will be more specifically 

addressed in next year’s annual network plan. 

For PM2.5, PM10, and Pb, if the network needs to have additional collocation 

monitors in order to meet the requirements, we will work with the appropriate air 

monitoring agencies to deploy the required number of additional collocation 

monitors. 
_______________________________________________________________________ 

25 2010 Annual Monitoring Network Report for Small Districts in California

Section 7. 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 and all 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. Of course, the 

intended operating schedule can be disrupted by instrument failures and other 

unanticipated situations. 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 6 below. The current operating schedules of the PM2.5

FRM monitors listed in Table 6 were obtained from the U.S. EPA’s AQS 

database. 

While there are a number of continuous PM2.5 monitors deployed, most of these 

are not federal reference or equivalent methods. In March of 2008, the U.S. EPA 

approved the first continuous PM2.5 FEM. In the ARB’s PQAO, there are seven 

continuous PM2.5 FEM sites; however, in the areas covered by this report, there 

are only two continuous PM2.5 FEM sites that are currently reporting data into the 

AQS database at this time. The two sites are Ukiah and Willits. 

Operating schedules for the manual PM10 samplers in the areas included in this 

report operate on a one day (24-hour) in every six day schedule. There are two 

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 TahoeSandy Way and Fort Bragg sites. The Northern Sonoma County APCD is 

transitioning to continuous PM10 monitoring within its network; however, no data 

are being reported to AQS at this time.
_______________________________________________________________________ 

26 2010 Annual Monitoring Network Report for Small Districts in California

Site Name AQS Site # Current Laboratory

LAKE COUNTY AIR BASIN

Lake County 

Lakeport-Lakeport Blvd 060333001 1 in 6 day LAKE COUNTY

MOJAVE DESERT AIR BASIN

Kern County 

Mojave-923 Poole Street 060290011 1 in 6 day SAN DIEGO COUNTY

Ridgecrest-100 West California 060290015 1 in 6 day SAN DIEGO COUNTY

MOUNTAIN COUNTIES AIR BASIN

Calveras County 

San Andreas-Gold Strike Road 060090001 1 in 6 day ARB

Nevada County 

Grass Valley-Litton Building 060570005 1 in 6 day ARB

Truckee-Fire Station 060571001 1 in 3 day ARB

Plumas County 

Portola-222 1st Avenue 060631007 1 in 3 day ARB

Quincy-N Church Street 060631006 1 in 3 day ARB

NORTHEAST PLATEAU AIR BASIN

Siskiyou County 

Yreka-Foothill Drive 060932001 1 in 6 day ARB

SACRAMENTO VALLEY AIR BASIN

Butte County

Chico-Manzanita Avenue 060070002 1 in 6 day ARB

Colusa County

Colusa-Sunrise Blvd 060111002 1 in 6 day ARB

Placer County

Roseville-N Sunrise Blvd 060610006 1 in 6 day ARB

Shasta County

Redding-Health Department Roof 060890004 1 in 6 day ARB

Sutter County

Yuba City-Almond Street 061010003 Everyday ARB

Yolo County

Woodland-Gibson Road 061131003 1 in 6 day ARB

* All PM10 monitors in the area included in this report are operated on a 1 in 6 day schedule except the 

continuous PM10 monitor at the South Lake Tahoe (060170011) and Fort Bragg (060450002) sites, 

which are currently reporting data into the AQS database.

Table 6

Current PM2.5 Operating Schedules*

(Monitors for the small air districts included in this report)
_______________________________________________________________________ 

27 2010 Annual Monitoring Network Report for Small Districts in California

Ozone operating schedules

While most O3 monitors operate continuously all year, a small number of O3 sites 

in the areas included in this volume 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) 

South Lake Tahoe-Airport (El Dorado County) 

Tuscan Butte (Tehama County) 
_______________________________________________________________________ 

28 2010 Annual Monitoring Network Report for Small Districts in California

Section 8. 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 NAAQS. 

8.1 Suitability for comparison to the annual PM2.5 NAAQS

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 NAAQS. 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. 

8.2 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, in March of 2008, the U.S. EPA 

approved a continuous monitor as the first type of PM2.5 FEM. A number of 

agencies around the State are now in various stages of purchasing and testdeploying these FEMs. One agency in the areas covered by this report has 

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. 

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 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 
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29 2010 Annual Monitoring Network Report for Small Districts in California

pollutant. The concurrent 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. 

The CFR requires that the U.S. EPA review and approve modifications to the 

SLAMS monitoring network, and requires that the responsible State or local 

agency inform the U.S. EPA of any proposed modifications. These requirements 

are in 40 CFR 58.14(b). 
_______________________________________________________________________ 

30 2010 Annual Monitoring Network Report for Small Districts in California

Section 9. 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 2011. Recently 

implemented monitoring site changes include deployed sites and monitors in the 

monitoring network that the ARB has become aware of since last year’s report 

and for which no official 2009 data were reported. The scope of recently 

implemented monitoring site changes also includes terminated sites and/or 

monitors that the ARB has become aware of since last year’s report. 

The Kern County APCD added continuous PM10 and ozone monitoring to the 

Tehachapi site. The district anticipates reporting the data to AQS and ARB in 

mid-2010. 

The Northern Sierra AQMD plans to add an ozone monitor to the Truckee site to 

determine compliance with the air quality standards. 

The Northern Sonoma County APCD is transitioning to real time monitoring for 

PM10 at Cloverdale, Guerneville, and Healdsburg, however, no data has yet been 

submitted to the AQS database. The continuous PM10 BAMs will operate with 

each site’s existing filter PM10 monitor for a period of time that will be determined 

by the district. 

The Tehama County APCD added a continuous PM2.5 FEM to their monitoring 

network; however, no data has yet been submitted to the AQS database. 

The ARB plans to make the following changes: 

• Relocate the Calexico-East site to another location in Imperial County. In 

addition, the Calexico-Ethel site will need to be moved from its current 

location to a more suitable site in the border area. 

• Relocate the PM2.5 monitor at the Bakersfield-E Planz site. 

• Close the Arvin-Bear Mountain Road site in the fall of 2010, at the 

conclusion of parallel ozone monitoring. The Arvin-Di Giorgio site will 

become the long-term replacement site for Arvin Bear Mountain Road. 

• As part of the NCore requirements, the ARB plans to add trace CO, trace 

SO2, NOy, PM Coarse, and PM speciation monitors to the Fresno-First 

Street site. 
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31 2010 Annual Monitoring Network Report for Small Districts in California

• Deploy methane/CO2 instruments and trace CO analyzers at ArvinDiGiorgio, Mount Wilson, Madera-Pump, and Tranquility for a special 

purpose monitoring. 

• Assess whether to establish monitoring on Catalina Island for shipping 

impacts on air quality. 

• Pesticide monitoring in Ventura County and Santa Maria. 

• Toxics monitoring in Kettleman City, including monitoring at a near by 

hazardous waste disposal facility. 

Moreover, ARB is planning to replace several filter-based PM2.5 FRM samplers 

and non-FEM BAMs with FEM BAMs as outlined in Table 7. The deployment 

began in late April and will continue until the fall of 2010. 

SITE PLANNED CHANGE

Replace non-FEM BAM with FEM BAM.

Existing FRM will become a collocated FRM to a primary 

FEM BAM.

Stockton Replace FRM and non-FEM BAM with FEM BAM. Deploy 

another FEM BAM to run as a collocated.

San Andreas Replace FRM with FEM BAM.

Santa Barbara Replace FRM and District non-FEM BAM with FEM BAM.

Santa Maria Replace FRM and District non-FEM BAM with FEM BAM

Colusa Replace FRM and non-FEM BAM with FEM BAM.

San Luis Obispo Replace FRM and non-FEM BAM with FEM BAM.

Mojave-Poole Replace FRM with FEM BAM. Replace PM10 SSI with FEM 

PM10 BAM.

Bakersfield-E Planz Add non-FEM BAM to operate in parallel with existing FRM.

Modesto

Table 7

Planned Changes to PM2.5 Monitors
_______________________________________________________________________ 

32 2010 Annual Monitoring Network Report for Small Districts in California

Section 10. 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. 

A broad overview of information about ambient air quality data in general in a 

question and answer format can be found at the following web page: 

http://www.arb.ca.gov/aqd/aqfaq/. This web page includes dozens of links to 

additional technical and non-technical information. 

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. 

In addition to this report, there is another report that contains listings of 

monitoring in the State, along with the years for which data is available for each 

monitor and regional maps showing the locations of the monitoring sites. To 

view this report on the web, go to http://www.arb.ca.gov/aqd/netrpt/netrpt.htm. 

ARB’s Planning and Technical Support Division (PTSD) maintains this 

information. 

To view summaries of the official air quality data from sites around the State, go 

to http://www.arb.ca.gov/adam/welcome.html. For summaries of the data 

monitored today, yesterday, last week, and the last few months, go to 

http://www.arb.ca.gov/aqd/aqinfo.htm. These last two sources of information are 

maintained by the PTSD, 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. 
_______________________________________________________________________ 

33 2010 Annual Monitoring Network Report for Small 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: 

Merrin Wright, Manager, Quality Assurance Section, mwright@arb.ca.gov, 

(916) 324-6191 

Agency contacts for the air districts covered in this report

Amador County Air Pollution Control District, Jackson, CA 

Jim Harris, Air Pollution Control Officer 

jharris@amadorapcd.org

(209) 257-0112 

Butte County Air Quality Management District, Chico, CA 

Gail Williams, Senior Air Quality Planner 

gwilliams@bcaqmd.org

(530) 891-2882 

Calaveras County Air Pollution Control District, San Andreas, CA 

Lakhmir Grewal, Air Pollution Control Officer 

lgrewal@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 

El Dorado County Air Quality Management District, Placerville, CA 

Marcella McTaggart, Air Pollution Control Officer 

marcella.mctaggart@edcgov.us

(530) 621-6662 
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34 2010 Annual Monitoring Network Report for Small Districts in California

Feather River Air Quality Management District, Marysville, CA 

David Valler, Air Pollution Control Officer 

fraqmd@fraqmd.org

(530) 634-7659 

Glenn County Air Pollution Control District, Willows, CA 

Kevin Tokunaga, Environmental Program Manager 

ktokunaga@countyofglenn.net

(530) 934-6500 

Kern County Air Pollution Control District, Bakersfield, CA 

Dave Jones, Air Pollution Control Officer 

JonesDa@co.kern.ca.us

(661) 862-5250 

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 

Joe Bertotti, Air Pollution Control Officer 

jbertotti@co.lassen.ca.us

(530) 252-4247 

Mariposa County Air Pollution Control District, Mariposa, CA 

Charles Mosher, Air Pollution Control Officer 

air@mariposacounty.org

(209) 966-2220 

Mendocino County Air Quality Management District, Ukiah, CA 

Christopher Brown, 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 

Northern Sonoma County Air Pollution Control District, Healdsburg, CA 

Barbara Lee, Air Pollution Control Officer 

Randy Woodward, Air Pollution Specialist 

nsc@sonic.net

(707) 433-5911 
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35 2010 Annual Monitoring Network Report for Small Districts in California

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) 841-4029 

Tehama County Air Pollution Control District, Red Bluff, CA 

Carol Golsh, Air Pollution Control Specialist 

cgolsh@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 
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36 2010 Annual Monitoring Network Report for Small Districts in California

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37 2010 Annual Monitoring Network Report for Small 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 O3 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 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 Pb monitoring sites in accordance with the 

requirements of appendix D to this part 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 to be operational by January 1, 

2010, and for all required non-source-oriented Pb monitoring sites to be 

operational by January 1, 2011. Specific site locations for the sites to be 

operational by January 1, 2011 are not required as part of the July 1, 2009 

annual network plan, but shall be included in the annual network plan due to be 

submitted to the EPA Regional Administrator on July 1, 2010. 
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38 2010 Annual Monitoring Network Report for Small Districts in California

(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 PM2.5 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 non-sourceoriented 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 Pb-PM10 

monitoring in lieu of Pb-TSP monitoring as allowed for under paragraph 2.10 of 

Appendix C to 40 CFR part 58. 

(c) The annual monitoring network plan must document how States and local 

agencies provide for the review of changes to a PM2.5monitoring network that 

impact the location of a violating PM2.5 monitor or the creation/change to a 

community monitoring zone, including a description of the proposed use of 

spatial averaging for purposes of making comparisons to the annual PM2.5 -

NAAQS as set forth in appendix N to part 50 of this chapter. 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 
_______________________________________________________________________ 

39 2010 Annual Monitoring Network Report for Small Districts in California

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. For PM2.5, the assessment also must identify needed changes to 

population-oriented sites. 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 first assessment is due 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. 
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40 2010 Annual Monitoring Network Report for Small Districts in California

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41 2010 Annual Monitoring Network Report for Small Districts in California

APPENDIX B 

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