Winds have begun shifting to the east, which drove the Eaton fire toward Arcadia and Monrovia early Wednesday morning. Smoke will more likely begin to blow into the eastern San Gabriel Valley, not as much to the south of the fire, Lyou explained. “Arcadia, Duarte and Azusa may see elevated levels (of bad air) from that fire,” he said.

Already known for having some of the worst air quality in the U.S., people in Southern California are now also at risk of inhaling smoke.

Millions of people across Southern California are under a Red Flag warning as a dangerous windstorm fanned blazes in the Los Angeles area, including the Palisades Fire, which has triggered evacuations and burned hundreds of acres.