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

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 ...

As wind and fire conditions change rapidly, zoom in and out on the interactive map below to see where air quality is worst around Southern California and the U.S. You can also open the map in a ...

Check real-time AQI using Google Maps: Air quality in the northern parts of India is deteriorating fast with the AQI crossing the 450 mark in the national capital. While the government is taking ...