Californian wildfires: Sky turns orange in San Francisco because of smokePublished10 September 2020Image source, ReutersImage caption, People have woken up to orange skies in San Francisco because of the Californian wildfires. Wind has blown the ash from the fires across California. These smoke particles 鈥渙nly allow yellow-orange-red light to reach the surface, causing skies to look orange鈥 according to Bay Area Air Quality.Image source, Getty ImagesImage caption, The San Francisco skyline is hidden in heavy orange smoke. Approximately 14,000 firefighters are battling 28 major blazes across California. The state has seen extreme temperatures recently, with Los Angeles County recording its highest ever temperature of 49.4 degrees on Sunday.Image source, ReutersImage caption, This is the view over Oracle Park, where the San Francisco Giants played Seattle Mariners in baseball. The orange sky hangs above the players.Image source, Getty ImagesImage caption, A man looks out at the red orange sky. The wildfires have burned more than 2.5 million acres in the state this year according to the California Department of Forestry and Fire Protection (Cal Fire).Image source, ReutersImage caption, People look out over San Francisco bay to the historic Alcatraz island. The dense and tall smoke from the wildfires has blocked out the sun.More on this storyNew campaign launched to support children's mental healthPublished9 September 2020California fires burn through a record two million acresPublished8 September 2020