Multiple U.S. states and Canadian provinces are experiencing poor air quality from wildfire smoke. Here's where.

Wildfire smoke degrades air quality in swaths of Ontario, with Toronto ranking among the worst in the world on Monday.

The National Weather Service has issued both a heat and air quality alert for most of downstate New York, Wednesday, July 16.

EDT on Tuesday, the National Weather Service reported an air quality alert in effect until Thursday at midnight EDT for ...

OAKLAND — Mere months after dismissing criminal charges against one of the East Bay’s largest metal recyclers, Alameda County ...

Air quality in the Chicago area has remained poor for three days in a row, the NBC 5 Storm Team reported Wednesday morning.