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 Cram fire is the largest in the state, expanding overnight to more than 64,000 acres, according to the Northwest ...

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

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