The Air District is the regional government agency responsible for air quality in the nine Bay Area counties: Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara, southwestern Solano, and southern Sonoma. The Air District was created by state law in 1955.
We measure and analyze air quality, develop air quality rules, ensure that businesses comply with air pollution laws and regulations, give grants to encourage clean air, work with communities to improve air quality, and administer the Spare the Air and Winter Spare the Air programs.
Our mission is to protect and improve public health, air quality, and the global climate.