The U.S. Air Quality Index (AQI) is the Environmental Protection Agency’s tool for reporting outdoor air quality and health.

The Chicago area was under an air quality alert Wednesday due to the Canadian wildfire smoke.Environmental officials said the ...

At a packed Houston-area meeting on pollution permits for Exxon Mobil last year, Baytown resident Harvey Windham waved a ...

On September 18, 2019, the Trump administration announced the revocation of California's waiver, which allowed the state to enforce stricter greenhouse gas emissions and zero-emission vehicle mandates ...

In Louisiana, a new law makes it illegal for community groups to share air pollution data gathered using technology that wasn't approved by the Environmental Protection Agency. The community ...

Many power plants benefiting from exemptions rank among the nation’s worst polluters. The Trump administration says cheaper ...

WASHINGTON— The Environmental Protection Agency has rejected Arizona’s approval of an air pollution permit for a new mine in the Patagonia Mountains south of Tucson. The EPA’s May 30 ruling found the ...

Plumes of smoke are blanketing large swaths of the U.S. and parts of Europe, presenting risks for those breathing it. The ...

Community groups are fighting an unusual Louisiana law that restricts how they use data from air-quality monitors, saying it ...

A portion of eastern and northeast Iowa has "unhealthy" air quality Wednesday, according to the Environmental Protection Agency.

The DEP says the Lehigh Valley (Berks, Lehigh, and Northampton counties) will be affected by the haze and smoke from ...

If you’re outside today, be advised you could feel the effects of air quality that weather experts say has entered “unhealthy ...