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The Bay Area Air Quality Management District is tasked with regulating 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. 

From November 1 through the end of February, the use of fireplaces, pellet stoves, wood stoves, fireplace inserts and outdoor fire pits is illegal when air quality is expected to reach unhealthy levels. Each day by 2 p.m., the Air District will issue an air quality forecast for the next day. If air quality is forecast to be unhealthy, a Winter Spare the Air Alert will be called, and wood burning will be banned the entire next day, for a full 24 hours.