California Air Resources Board California map with County Boundaries
California County and PM10 Monitoring Site Directory

This directory provides access to an PM10 data summary for each county and the monitoring sites within each county.   Some counties have portions of the county in separate air basins.   For counties that are split into more than one air basin, data summaries are available for the portion of the county within an air basin.  These summaries can be accessed by selecting the corresponding air basin from the California Air Basins map.

  Alphabetical Listing of "California Counties and Monitoring Sites"  
|A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Select the specific letter of the alphabet corresponding to the county of interest.  Or scroll down the screen to find the desired county or monitoring site.  To view summary data for a county, or monitoring site within a county, click on the corresponding name.
 
Counties Monitoring Sites
 
Alameda County Fremont-Chapel Way
  Livermore-Old 1st Street
  San Leandro-County Hospital
 
Amador County Buena Vista-5730 Buena Vista Road
  Jackson-Buena Vista Road
 
Butte County Chico-Manzanita Avenue
 
Calaveras County San Andreas-Gold Strike Road
 
Colusa County Colusa-Sunrise Blvd
 
Contra Costa County Bethel Island Road
  Concord-2975 Treat Blvd
  Richmond-13th Street
  San Pablo-El Portal
 
Del Norte County Crescent City-9th and H Street
 
El Dorado County Placerville-Gold Nugget Way
  South Lake Tahoe-Sandy Way
 
Fresno County Clovis-N Villa Avenue
  Five Points
  Fresno-1st Street
  Fresno-Drummond Street
 
Glenn County Willows-E Laurel Street
  Willows-N Villa Avenue
 
Humboldt County Blue Lake-Greenwood Avenue
  Eureka-Health Dept 6th and I Street
 
Imperial County Brawley-Main Street
  Calexico-East
  Calexico-Ethel Street
  Calexico-Grant Street
  El Centro-9th Street
  Niland-English Road
  Westmorland-W 1st Street
  Winterhaven-2nd Avenue
 
Inyo County Bishop-351 N Main Street
  Coso Junction-10 miles E
  Coso Junction-Highway 395 Rest Area
  Keeler
  Keeler-Cerro Gordo Road
  Lone Pine-E Locust Street
  Olancha-E Fall Road
  Olancha-Walker Creek Road
  Pearsonville-Pearson Road
 
Kern County Bakersfield-5558 California Avenue
  Bakersfield-Chester Street
  Bakersfield-Golden State Highway
  China Lake-Powerline Road
  Inyokern-Airport
  Kern Refuge
  Mojave-923 Poole Street
  Mojave-Airport
  Oildale-3311 Manor Street
  Ridgecrest-Las Flores Avenue
  Taft College
 
Kings County Corcoran-Patterson Avenue
  Corcoran-Van Dorsten Avenue
  Hanford
  Hanford-S Irwin Street
  Kettleman City-CalTrans
 
Lake County Lakeport-Lakeport Blvd
 
Lassen County Susanville-Russel
 
Los Angeles County Azusa
  Burbank-W Palm Avenue
  Hawthorne
  Lancaster-W Pondera Street
  Los Angeles-North Main Street
  North Long Beach
  Santa Clarita-County Fire Station
 
Madera County Madera-Library
 
Marin County San Rafael
 
Mariposa County Yosemite Village-Visitor Center
 
Mendocino County Fort Bragg-N Franklin Street
  Ukiah-County Library
  Willits-Firehouse
 
Merced County Los Banos-5th Street
  Merced-Health Dept
 
Modoc County Alturas-W 4th Street
 
Mono County Lee Vining-SMS
  Mammoth Lakes-Gateway HC
  Mono Lake-Simis Residence
 
Monterey County Carmel Valley-Ford Road
  King City-750 Metz Road
  Monterey-Silver Cloud Court
  Moss Landing - Sandholt Road
  Salinas-Natividad Road #2
 
Napa County Napa-Jefferson Avenue
 
Nevada County Grass Valley-Annie
  Grass Valley-Henderson Street
  Nevada City-Willow Valley
  Truckee-Fire Station
  Truckee-Glenshire Fire Station
 
Orange County Anaheim-Harbor Blvd
  El Toro
  Newport Beach-University
 
Placer County Auburn-Dewitt-C Avenue
  Colfax-City Hall
  Lincoln-L Street
  Olympic Valley-Squaw Valley
  Rocklin-Rocklin Road
  Roseville-N Sunrise Blvd
 
Plumas County Chester-222 1st Avenue
  Quincy-N Church Street
 
Riverside County Banning-Allesandro
  Indio-Jackson Street
  Norco-Norconian
  Palm Springs-Fire Station
  Perris
  Riverside-Rubidoux
  Temecula-Rancho California Road
 
Sacramento County Citrus Heights-Sunrise Blvd
  North Highlands-Blackfoot Way
  Sacramento-Branch Center Road
  Sacramento-Del Paso Manor
  Sacramento-Earhart Drive
  Sacramento-Health Dept Stockton Blvd
  Sacramento-T Street
 
San Benito County Hollister-Fairview Road
 
San Bernardino County Barstow
  Fontana-Arrow Highway
  Hesperia-Olive Street
  Lake Gregory
  Lucerne Valley-Middle School
  Ontario-Airport
  Redlands-Dearborn
  San Bernardino-4th Street
  Trona-Athol
  Trona-Athol and Telegraph
  Trona-Market Street
  Twentynine Palms-Adobe Road
  Twentynine Palms-Adobe Road #2
  Victorville-Armagosa Road
 
San Diego County Chula Vista
  El Cajon-Redwood Avenue
  Escondido-E Valley Parkway
  Oceanside-Mission Avenue
  Otay Mesa-Paseo International
  San Diego-12th Avenue
  San Diego-Overland Avenue
 
San Francisco County San Francisco-Arkansas Street
 
San Joaquin County Stockton-Hazelton Street
  Stockton-Wagner-Holt School
 
San Luis Obispo County Arroyo Grande-Ralcoa Way
  Atascadero-Lewis Avenue
  Morro Bay
  Nipomo-Guadalupe Road
  Nipomo-South Wilson Street
  Paso Robles-Santa Fe Avenue
  San Luis Obispo-Marsh Street
 
San Mateo County Redwood City
 
Santa Barbara County El Capitan Beach
  Exxon Site 10-UCSB West Campus
  Gaviota-East
  Gaviota-GTC Site A
  Gaviota-GTC Site C
  Gaviota-West
  Jalama Beach
  Las Flores Canyon #1
  Las Flores Canyon #2
  Las Flores Canyon #3
  Lompoc-S H Street
  Point Conception-Lighthouse
  Santa Barbara-W Carillo Street
  Santa Maria-Library
  Vandenberg Air Force Base-STS Power
  Vandenberg Air Force Base-Watt Road
 
Santa Clara County San Jose-4th Street
  San Jose-935 Piedmont Road
  San Jose-Moorpark Avenue
  San Jose-Tully Road
  San Jose-W San Carlos Street
 
Santa Cruz County Davenport
  Santa Cruz-2544 Soquel Avenue
  Santa Cruz-Bostwick Lane
  Scotts Valley-Vine Hill
  Watsonville-Airport Boulevard
 
Shasta County Anderson-North Street
  Burney-Siskiyou
  Redding-Health Dept Roof
 
Sierra County Loyalton-W 3rd Street
 
Siskiyou County Lava Beds Natl Monument
  Mt Shasta-Alma
  Mt Shasta-N Old Stage Road
  Yreka-Foothill Drive
 
Solano County Vacaville-Merchant Street
  Vallejo-304 Tuolumne Street
 
Sonoma County Cloverdale
  Guerneville-Church and 1st
  Healdsburg-133 Matheson Street
  Santa Rosa-5th Street
 
Stanislaus County Modesto-14th Street
  Modesto-I Street
  Turlock-S Minaret Street
 
Sutter County Yuba City-Almond Street
 
Tehama County Red Bluff-Riverside Drive
 
Trinity County Weaverville-Courthouse
 
Tulare County Visalia-N Church Street
 
Ventura County El Rio-Rio Mesa School #2
  Ojai-1768 Maricopa Highway
  Ojai-Ojai Avenue
  Piru-2 miles SW
  Simi Valley-Cochran Street
  Thousand Oaks-Moorpark Road
  Ventura-E Main Street
 
Yolo County West Sacramento-15th Street
  Woodland-Sutter Street

 
Please send questions or comments to:
aqdweb@arb.ca.gov
 
This page last revised on March 1, 1999
 

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