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.

As thousands of acres burn across Southern California, wildfire smoke is causing poor air quality in the region and beyond.

Millions of Los Angeles County residents are facing extremely hazardous air quality as wildfires continue to burn. The air quality index in Los Angeles on Wednesday was 178, which is considered to be "unhealthy" for any individual who is active outdoors.