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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. 

Beginning in 2019, a Spare the Air Alert banning wood burning can now be called for particulate pollution year-round, especially when there are wildfires impacting the Bay Area. On cool, calm days when there is an inversion layer of warm air acting as a lid over a layer of cold air, wood smoke can build up at ground level to unhealthy concentrations. When these conditions are expected, the Air District will call a Spare the Air Alert for particulate pollution, during which the use of fireplaces, outdoor fire pits, and wood stoves will not be allowed.