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 ...

Hundreds of wildfires are burning across the Western states, Alaska and Canada as fire season perks up amid a sprawling heat ...

Wildfire smoke worsens air quality. Wildfire smoke has been fouling U.S. air quality for several days, starting in states bordering Canada, including the Dakotas, Minnesota and other Midwestern ...

Six members of Congress from Wisconsin and Minnesota have asked Canada to say how it plans to tackle the blazes and reduce ...

This allowed the fires to burn under hot, dry skies and the smoke from the fires to funnel into the eastern United States. "It can get stuck in this persistent pattern for a while," she said.

Republican representatives from Minnesota and Wisconsin recently sent a formal letter to Canada, demanding that the nation ...

What’s happening in Canada could be a sign of what’s to come in the United States this year. Experts say it is difficult to tell how severe California’s wildfire season will be after good ...

It is not a linear trend, since some years are better than others. But the area burned by wildfires has doubled in Canada since the 1970s and quadrupled in the western United States in that same time.

Of the active fires, 74 are in Canada’s ... There are several good mapping resources for those wanting to track the wildfire outbreak and its smoke effects across Canada and the United States.

Of the more than 200 wildfires incinerating Canadian forests — and sending smoke into the United States — more than half are burning “out of control,” and some are being monitored but ...