Arizona is the only state with 'unhealthy' air quality. Part of it stems from our geography, but part also comes from our ...

AirNow is a collaborative effort of federal agencies that provides air quality data across the U.S. The site also has ...

Wildfires are tearing through thousands of acres in Los Angeles County in California, as strong Santa Ana winds stoke the ...

Already known for having some of the worst air quality in the U.S., people in Southern California are now also at risk of ...

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

The Air Quality Index, or AQI, is the primary system used to warn the public when air pollution is dangerous. It’s based on ...

Here's what to know about improving your air quality at home during a wildfire—these expert tips help you breathe easier when ...

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

Ash from the recent LA County fires and burn scars formed by other wildfires in the fall can be dispersed by strong winds. See an air quality map.

Good (Green): 0-50 AQI means there is little or no health risk associated with air quality. Moderate (Yellow): 51-100 AQI ...