Hundreds of small fires are raging in California as a result of extreme heat and thunderstorms.Faced with raging wildfires, California governor Gavin Newsome declared a state of emergency on August 18.

The San Francisco skyline is obscured by smoke from a wildfire in San Francisco, US, On August 19, local time.More than 30 wildfires are reported to be burning in California, including nearly 10 that started in the last two days.The monterey County fire has burned more than 1,600 hectares and is only 10 percent contained.

The wildfires have caused a significant drop in air quality in many parts of the state, particularly in the San Francisco Bay Area and other parts of northern California.San Francisco is shrouded in smog.