Multiple wildfires, including the Palisades Fire and Eaton Fire, are raging across Southern California Thursday, leaving at least 10 dead and burning more than 27,000 acres, officials say. Police have arrested 20 suspected looters.

Southern California ‒ with sprawling cities, clogged freeways and heavy industry ‒ is already notorious for some of the worst air quality in the nation. This week's wildfires are putting millions of people at risk for immediate health problems and longer-term issues.

The scourge of wildfires in Los Angeles and the surrounding area are the most destructive in the city’s history, and the city’s fire chief said the region was still in the midst of an “extreme weather event” as a new blaze quickly grew to 1,