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.

AirNow is a collaborative effort of federal agencies that provides air quality data across the U.S. The site also has up-to-date information about the wildfires, resources, data, and interactive maps to help users learn more about particular areas and how they might be affected. There's also a free AirNow mobile app.

A map from AirNow suggests that the air quality around Los Angeles and Anaheim, California, is unhealthy as the Palisades fire continues to burn in Los Angeles County. The fire, determined to be the most destructive in Los Angeles city history,