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.

Smoke from the raging Southern California wildfires is filling city skylines, causing officials to warn residents of poor air quality.