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

Plumes of smoke are blanketing large swaths of the U.S. and parts of Europe, presenting risks for those breathing it. The Midwest, Northeast and Great Lakes regions of the U.S. have ...

The Iowa Department of Natural Resources issued an air quality warning across the state from Tuesday to Thursday morning, ...

Smoke from Canadian wildfires is beginning to worsen air quality in the eastern U.S. as several Midwestern states battle ...

The Wisconsin Department of Natural Resources issued an air quality advisory through noon June 4 across parts of Wisconsin.

An air quality map shows conditions across the United States on Wednesday as Canadian wildfire smoke is forecast to continue ...

Trump spoke with Putin about Ukraine attacks and Iran's nuclear program; Putin may join Iran talks to help reach a resolution ...

Smoke from wildfires raging in Canada has drifted into the United States, affecting air quality as far south as Florida.

Western Washington faces increased wildfire threats following a notably dry May, with rainfall at Seattle-Tacoma Airport ...

The National Oceanic and Atmospheric Administration’s Space Weather Prediction Center has issued a G4 (severe) geomagnetic ...

WASHINGTON — As wildfires rage in Canada, smoke is drifting into the U.S., and also the D.C. Metro area through at least ...

A G4 geomagnetic storm is expected to last through June 2. Here’s some key information, including light pollution maps.