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.

The extreme fire conditions caused by a "life-threatening" windstorm have been deemed a "particularly dangerous situation," weather officials say.

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.