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

A White House memo ordered a halt to federal assistance and a review to align spending with Donald Trump’s priorities. Many ...

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

Retrofitting with modern HVAC units equipped with higher-efficiency filters and smart sensors can help to reduce airborne ...

A study led by researchers from the University of Virginia has used satellite measurements to show the long-term persistence ...

Four Texas counties were recently flagged by the Texas Commission on Environmental Quality for exceeding federal air quality ...

Firefighters continue to battle fires across Southern California as the area prepares for a presidential visit Friday and ...