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

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

People have been ordered to leave areas near the world famous Grand Canyon in Arizona due to rapidly spreading wildfires ...

The U.S. has one of the world’s most advanced systems to monitor air pollutants. Can it keep up with a changing climate?

Researchers at the University of Colorado Boulder found that wildfires in Colorado and throughout the western United States ...

As hundreds of wildfires continue to burn in Canada, the smoke from the flames is bringing potentially dangerous air quality to parts of the United States. ABC News. Live. Video. Shows.

Six Republican members of Congress – four of them from Minnesota – have called on Canada to impose 'better forest management.

Across much of the country, the smoke primarily contributed to orange-tinted skies and reduced visibility for pilots.. The scenes were a stark contrast to 2023, when smoke from Canadian wildfires ...

When wildfires devastated a wide swath of Los Angeles last winter ... at the University of Colorado Boulder analyzed 100,000 samples from 500 watersheds across the western United States. They found ...

With more than a hundred wildfires burning in Canada, the smoke is bringing potentially dangerous air quality conditions to parts of the northern United States. As of Monday, there are 181 active ...

A series of wildfires burning across central Canada have sent smoke billowing into the U.S. over the past several days.