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 ...

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 ...

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.

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 ...

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

Dust and ash left behind from the January wildfires in Los Angeles County can be irritating and hazardous to health when it's picked up by winds and spread throughout Southern California.

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, ...