The advisories impact large areas of Idaho, Oregon, Montana and Washington, lasting through the end of January.

The Air Quality Index measured 156 near Forks, Washington, and received a rating of "unhealthy," meaning some members of the general public may experience health effects and members of sensitive ...

The EPA measures regional air quality index (AQI) by how hazardous it is to the general public. Discover the AQI in your city by searching below.

Toxic smoke and dangerous particulate pollution are spreading far beyond the flames, leaving air quality at unhealthy levels in multiple counties.

Calculating air pollution from wildfires and other events has become more complicated. That doesn’t mean it’s necessarily more accurate.

This measure, based on data from the Environmental Protection Agency, evaluates states on the number of days the Air Quality Index in counties was not rated “good.” U.S. News calculated a ...

Wildfire smoke typically carries with it noxious gases and particulate matter that make it more toxic than normal air pollution. Not only do wildfires burn plants, brush and trees, but also buildings, ...

As fires rage across the West Coast, destroying homes and forcing evacuations, the air we breathe has been severely impacted. In the following California air quality map, you can see how the air ...

“We just try to stay indoors.” This week, as the wildfires raged and smoke billowed across Los Angeles, officials issued air quality alerts, schools cancelled classes and scientists warned ...