Map: Check the S.F. Chronicle’s live air ... a spokesperson for the Bay Area Air Quality Management District. A ridge of high pressure engulfing much of the western U.S. this week has mostly ...

Cal Fire is battling a vegetation fire in Napa County. The fire sparked in the 200 block of Crystal Springs Road in St. Helena. The Napa County Office of Emergency Services encourages people to avoid ...

According to Bay Area Air Quality Management District spokesman Ralph Borrmann, the smoke is filtering out blue light, giving skies around the Bay Area a red-orange tint. Calling all photographers!