It broke out in Ventura County.
Emergency services are on high alert and energy companies are planning wide-scale power outages to miminise the risk of sparking more fires.
As PG&E begins a second round of fire-safety power shutoffs, it warns a third, bigger blackout could be needed as soon as the weekend.
Indonesia and neighbouring countries in Southeast Asia are regularly hit by smoky haze from slash-and-burn clearances of forests for timber and palm oil plantations.
Officials urged people in the danger zone to evacuate and warned residents of health risks from dust and smoke.
Fires continue to consume the normally lush Amazon, killing animals and leading to respiratory illnesses according to the leader of an indigenous group in Rondonia state.
Thousands took to the streets in Rio de Janeiro on Sunday to demand that more be done to battle the wildfires in Brazil that have swept through parts of the Amazon region.
A wildfire that has raged across vast areas of the Spanish island of Gran Canaria since the weekend has abated as winds drop, local officials said Tuesday.
Around 2000 residents have been moved from their homes on Gran Canaria because of second forest fire within a week.
Amazon fires generate smoke cloud almost as big as devastating Siberia blaze