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.

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 ...

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

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 ...