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 three major fires continue to burn in the Los Angeles area, 17 million residents are affected by the drifting smoke. An air purifier with a HEPA filter can help.