Dense smoke from California wildfires up to 200 miles away obscures the view of traffic traveling on Interstate 80, looking west in Sparks, Nev., Wednesday, Aug. 19, 2020. Local schools canceled all outdoor activities as the air quality index approached the "very unhealthy" category for the general population Wednesday afternoon. (AP Photo/Scott Sonner)
August 20, 2020
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August 20, 2020 10:44 a.m.
Northern California wildfires threatening thousands of homes
Wildfires raging through Northern California are threatening thousands of homes and blackening the skies near San Francisco as crews struggle to surround them despite steep terrain and blistering heat