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 ...

Smoke billowing from wildfires is leading to poor air quality and reducing visibility throughout Manitoba this ...

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

Intense wildfires in Canada’s western provinces continued blazing Wednesday, sending smoke southward and triggering air quality alerts throughout the United States. More than 400 wildfires are ...

Wildfires in Canada are continuing to blanket its southern neighbors in smog, triggering new air quality alerts in the northern high plains, Midwest and Great Lakes, according to the National ...

Record-breaking wildfires in Canada are impacting air quality in the U.S. The Canadian wildfire season has started early and already broken records, with toxic smoke drifting south to the U.S. and ...

The current infrastructure also isn’t set up to fully account for the shifting behavior of wildfire smoke, which can travel ...

MILES PARKS, HOST: Something like 500 wildfires continue to burn across Canada, and it's affecting the air we breathe. Earlier this week, the air quality in Toronto was among the worst in the world.

Wildfires burning in Canada continue to create hazardous air quality conditions in several states in the northern U.S. Plumes of smoke from the fires blazing in Halifax, Nova Scotia, began ...