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

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

Much of Central Canada, Manitoba and Saskatchewan were placed under special air quality statements or warnings on Monday due ...

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.

Is the air you're breathing at the Toronto 2015 Pan Am/Parapan Am Games at the University of Toronto Scarborough any cleaner than the air you're breathing watching the Games at the downtown campus?. A ...

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, ...

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

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

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

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. By Dan Bilefsky Toronto has ...