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

Specialized air quality instruments captured a spike in lead, chlorine, and bromine pollution during the L.A. wildfires.

Researchers contributing to the ASCENT network of air quality sensors observed spikes in lead and chlorine downwind from the Eaton Fire – and their measurements are now publicly available.

Poor air quality isn't always obvious, but it's a serious health issue affecting both our indoor and outdoor environment ...

I’m very happy to say what we studied, what we expected and what we planned for is what seems to be happening,” the MTA’s ...

Air quality in Pittsburgh is improving, according to year-over-year data. Why it matters: Long-term exposure to poor air quality is harmful to your health and has been a problem in Pittsburgh for ...

Maricopa and Pinal counties both failed to meet federal air quality standards and will now become part of an Arizona State ...

An air quality alert was issued on Tuesday at 5:03 a.m. for Josephine County.

Missoula is under an Air Stagnation Advisory until Friday. But, what exactly does that mean? Let's learn more about ...

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

Even with thick smoke coming from the Hughes Fire, skies have been clear in many areas, and the air quality forecast has been ...

If you have been hearing about poor air quality in New York City Friday, you can breathe a deep sigh of relief (literally): ...