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

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

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

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

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

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.

As of Tuesday night, Toronto's air quality is predicted to reach a six on the 10-point Air Quality Health Index (AQHI) scale, which measures air quality based on how it will impact health.

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 ...

Toronto’s air quality was the worst in the world due to the wildfire smoke earlier on Wednesday, according to data from Swiss air quality tracker IQAir. While no longer the worst, it is still ...