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California
is divided geographically into air basins for the purpose of managing
the air resources of the State on a regional basis. An air basin
generally has similar meteorological and geographic conditions
throughout. The State is currently divided into 15 air basins. The
names of the basins are listed below on the state map or in the Air Basin Directory list. To view the 2008 estimated
emissions for an air basin and the counties within the basin, click on
the basin map or the basin list.
| California
Air Basins and Counties (Select Air Basin for
Additional Information) |
| AIR BASINS |
COUNTIES |
| Great Basin Valleys |
Alpine,
Inyo, Mono |
| Lake County |
Lake |
| Lake Tahoe |
El
Dorado, Placer |
| Mojave Desert |
Kern,
Los Angeles, San Bernardino, Riverside |
| Mountain Counties |
Amador,
Calaveras, El Dorado, Mariposa, Nevada, Placer, Plumas, Sierra, Tuolumne |
| North Central Coast |
Monterey, San Benito, Santa Cruz |
| North Coast |
Del
Norte, Humboldt, Mendocino, Sonoma, Trinity |
| Northeast Plateau |
Lassen,
Modoc, Siskiyou |
| Sacramento Valley |
Butte,
Colusa, Glenn, Placer, Sacramento, Shasta, Solano, Sutter, Tehama,
Yolo, Yuba |
| Salton Sea |
Imperial,
Riverside |
| San Diego |
San
Diego |
| San Francisco Bay Area |
Alameda,
Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara,
Solano, Sonoma |
| San Joaquin Valley |
Fresno,
Kern, Kings, Madera, Merced, San Joaquin, Stanislaus, Tulare |
| South Central Coast |
San
Luis Obispo, Santa Barbara, Ventura |
| South Coast |
Los
Angeles, Orange, Riverside, San Bernardino |
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