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

Poor air quality has been detected in multiple states surrounding California. The state has been hit with multiple deadly fires that left thousands of homes destroyed. Wildfire smoke contains fine ...

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 ...

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 ...

Dust and ash left behind from the wildfires across Southern California can be irritating and hazardous when inhaled.

Hazardous air quality can affect people's health in multiple ways, ranging from headaches and eye irritation to trouble breathing and even heart failure. Here's how to tell if you're in an area at ...

Millions woke up to hazy skies and poor air quality Wednesday morning as crews continued to fight the Palisades Fire in western Los Angeles, the Eaton Fire near Altadena and the Hurst/Sylmar Fire ...