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.

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

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With hazardous levels of smoke lingering over Los Angeles County because of the slew of wildfires currently burning throughout the region, county officials are urging the public to stay safe. Kirsten Mitchell reports.