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

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Smoke from wildfires in Manitoba, a Western province facing its worst fire season in 30 years, has created hazardous air ...

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

Parts of the Greater Toronto Area remained under a special air quality statement and a heat warning on Monday night.

Tuesday’s air quality warning has dropped to a 5, considered a moderate risk, down from Monday’s peak of 10+ on the Air Quality Health Index’s 10-point scale.

Ontario's poor air quality and hazy skies will persist for the next couple of days for many areas, with widespread alerts ...

Environment Canada has placed Toronto, and the surrounding GTA, under both a heat wave and a poor air quality warning due to ...

The city had among the worst air quality in the world for a time on Wednesday and officials warned that poor air quality in the area would likely last into Friday.

Expect deteriorating air quality across parts of Ontario as we start this new workweek, as upper-level winds blow wildfire smoke into the region. Some of the smoke could mix down to the surface, ...

Environment Canada issued a special air quality statement for Toronto Tuesday afternoon, advising that high levels of air pollution will develop in the evening due to smoke from forest fires in ...

Drifting smoke from the Canadian wildfires will worsen air quality in at least eight U.S. states and prompted alerts for some. The National Weather Service said the smoke will impact most of the ...