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The Air District regulates stationary sources of air pollution in the nine counties that surround San Francisco Bay: Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara, southwestern Solano, and southern Sonoma counties.
The California Legislature created the Air District in 1955 as the country’s first regional air pollution control agency. It is governed by a 24-member Board of Directors of locally elected officials from each Bay Area county, with the number of members proportionate to each county’s population.