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

This directory provides access to an ozone 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
  Hayward-La Mesa
  Livermore-Old 1st Street
  Oakland-Alice Street
  San Leandro-County Hospital
 
Amador County Jackson-Clinton Road
 
Butte County Chico-Manzanita Avenue
 
Calaveras County San Andreas-Gold Strike Road
 
Colusa County Colusa-Fairgrounds
  Colusa-Sunrise Blvd
 
Contra Costa County Bethel Island Road
  Concord-2975 Treat Blvd
  Pittsburg-10th Street
  Richmond-13th Street
  San Pablo-El Portal
 
Del Norte County Gasquet-Airport
  Redwood Natl Park-Requa
 
El Dorado County Cool-Highway 193
  Placerville-Gold Nugget Way
  South Lake Tahoe-Sandy Way
 
Fresno County Clovis-N Villa Avenue
  Fresno-1st Street
  Fresno-Drummond Street
  Fresno-Sierra Skypark #2
  Parlier
  Shaver Lake - Perimeter Road
 
Glenn County Willows-E Laurel Street
 
Imperial County Calexico-East
  Calexico-Ethel Street
  Calexico-Grant Street
  El Centro-9th Street
  Niland-English Road
  Westmorland-W 1st Street
 
Inyo County Bishop-Short Street
  Death Valley Natl Monument
 
Kern County Arvin-Bear Mountain Blvd
  Bakersfield-5558 California Avenue
  Bakersfield-Golden State Highway
  Boron-26965 Cote Street
  Edison
  Maricopa-Stanislaus Street
  Mojave-923 Poole Street
  Oildale-3311 Manor Street
  Shafter-Walker Street
  Tehachapi-Jameson Road
 
Kings County Hanford-S Irwin Street
 
Lake County Lakeport-Lakeport Blvd
 
Los Angeles County Azusa
  Burbank-W Palm Avenue
  Diamond Bar-E Copley Drive
  Glendora-Laurel
  Hawthorne
  Lancaster-W Pondera Street
  Los Angeles-North Main Street
  Lynwood
  North Long Beach
  Palmdale
  Pasadena-S Wilson Avenue
  Pico Rivera
  Pomona
  Reseda
  Santa Clarita-County Fire Station
  West Los Angeles-VA Hospital
 
Madera County Madera-Health Dept #2
  Madera-Pump Yard
 
Marin County San Rafael
 
Mariposa County Jerseydale - 6440 Jerseydale
  Yosemite National Park-Wawona Valle
  Yosemite Natl Park-Turtleback Dome
 
Mendocino County Ukiah-E Gobbi Street
  Willits-899 S Main Street
 
Merced County Merced-S Coffee Avenue
 
Mono County Mammoth Lakes-Gateway HC
 
Monterey County Carmel Valley-Ford Road
  King City-750 Metz Road
  Monterey-Silver Cloud Court
  Salinas-Natividad Road #2
 
Napa County Napa-Jefferson Avenue
 
Nevada County Grass Valley-Litton Building
  Truckee-Fire Station
  White Cloud Mountain
 
Orange County Anaheim-Harbor Blvd
  Costa Mesa-Mesa Verde Drive
  El Toro
  La Habra
 
Placer County Auburn-Dewitt-C Avenue
  Colfax-City Hall
  Rocklin-Rocklin Road
  Roseville-N Sunrise Blvd
 
Plumas County Quincy-N Church Street
 
Riverside County Banning-Allesandro
  Banning-South Hathaway Street
  Hemet-State Street
  Indio-Jackson Street
  Lake Elsinore-W Flint Street
  Norco-Norconian
  Palm Springs-Fire Station
  Perris
  Riverside-Rubidoux
 
Sacramento County Elk Grove-Bruceville Road
  Folsom-City Corporation Yard
  Folsom-Natoma Street
  North Highlands-Blackfoot Way
  Sacramento-3801 Airport Road
  Sacramento-Del Paso Manor
  Sacramento-Earhart Drive
  Sacramento-T Street
  Sloughouse
 
San Benito County Hollister-Fairview Road
  Pinnacles National Monument
 
San Bernardino County Barstow
  Flash Mountain
  Fontana-Arrow Highway
  Hesperia-Olive Street
  Joshua Tree-National Monument
  Lake Gregory
  Mount Baldy, Mount Baldy Road
  Phelan-Beekley Road & Phelan Road
  Quartzite Mountain
  Redlands-Dearborn
  San Bernardino-4th Street
  Shadow Mountain
  Trona-Athol
  Trona-Athol and Telegraph
  Twentynine Palms-Adobe Road #2
  Upland
  Victorville-Armagosa Road
 
San Diego County Alpine-Victoria Drive
  Camp Pendleton
  Chula Vista
  Del Mar-Mira Costa College
  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-E Mariposa
  Stockton-Hazelton Street
  Tracy-24081 Patterson Pass Road
  Tracy-24371 Patterson Pass Road
 
San Luis Obispo County Atascadero-Lewis Avenue
  Grover City-Lesage Drive
  Morro Bay
  Nipomo-Guadalupe Road
  Nipomo-South Wilson Street
  Nipomo-Teft & Pomeroy Streets
  Paso Robles-Santa Fe Avenue
  San Luis Obispo-Marsh Street
 
San Mateo County Redwood City
 
Santa Barbara County Battles-Betteravia Road
  Carpinteria-Gobernador Road
  El Capitan Beach
  Exxon Site 10-UCSB West Campus
  Gaviota-East
  Gaviota-GTC Site A
  Gaviota-GTC Site B
  Gaviota-GTC Site C
  Gaviota-West
  Goleta-Fairview
  Jalama Beach
  Las Flores Canyon #1
  Lompoc-HS&P
  Lompoc-S H Street
  Paradise Road-Los Padres National F
  Point Conception-Lighthouse
  Santa Barbara-W Carillo Street
  Santa Maria-Broadway
  Santa Rosa Island
  Santa Ynez-Airport Road
  Vandenberg Air Force Base-Pt Arguel
  Vandenberg Air Force Base-STS Power
  Vandenberg Air Force Base-Watt Road
 
Santa Clara County Gilroy-9th Street
  Los Gatos
  Mountain View-Cuesta
  San Jose-4th Street
  San Jose-935 Piedmont Road
  San Jose-W San Carlos Street
  San Martin-Murphy Avenue
 
Santa Cruz County Davenport
  Santa Cruz-2544 Soquel Avenue
  Santa Cruz-Bostwick Lane
  Scotts Valley-Scotts Valley Drive
  Scotts Valley-Vine Hill
  Watsonville-Airport Boulevard
 
Shasta County Anderson-North Street
  Lassen Volcanic Natl Park-Manzanita
  Redding-Health Dept Roof
 
Siskiyou County Yreka-Foothill Drive
 
Solano County Fairfield-Bay Area AQMD
  Vacaville-Elmira Road
  Vallejo-304 Tuolumne Street
 
Sonoma County Healdsburg-Municipal Airport
  Santa Rosa-5th Street
  Sonoma-1st Street
 
Stanislaus County Crows Landing NAS-Fire Station
  Modesto-14th Street
  Modesto-Rover 14th Street
  Turlock-S Minaret Street
 
Sutter County Pleasant Grove-4 miles SW
  Sutter Buttes-S Butte
  Yuba City-Almond Street
 
Tehama County Red Bluff-Oak Street
  Red Bluff-Walnut Street
  Tuscan Butte
 
Tulare County Sequoia National Park-Lookout Point
  Sequoia Natl Park-Ash Mountain #1
  Sequoia Natl Park-Giant Forest
  Sequoia Natl Park-Lower Kaweah
  Visalia-N Church Street
  Wilsonia-Grant Grove
 
Tuolumne County Five Mile Learning Center
  Sonora-Barretta Street
  Yosemite National Park-Camp Mather
 
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 County-W Casitas Pass Road
  Ventura-Emma Wood State Beach
 
Yolo County Davis-UCD Campus
  Woodland-Gibson Road
  Woodland-Sutter Street

 
Please send questions or comments to:
aqdweb@arb.ca.gov
 
This page last revised on March 26, 1999
 

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