Smoke from wildfires in Canada has spread more than 5,000 miles, reaching parts of Russia and Europe during the past week.

California's largest blaze this year explodes in size as hot weather raises wildfire risk statewide Megalodon Sharks Were ...

An air quality map shows conditions improving in the U.S. on Friday as smoke from the Canadian wildfires subsides.

Canada's environment ministers back tougher air quality standards, citing wildfire smoke and rising health risks from fine ...

Smoke from wildfires still raging in Canada is degrading air quality across the northern U.S., turning skies a murky orange hue and forcing sensitive groups indoors. At such a critical moment in US ...

Smoke from the Canadian wildfires continues to bring potentially dangerous air quality to parts of the northern U.S., with ...

There is an air quality advisory for Saturday due to wildfire smoke in parts of Ontario. Environment Canada says wildfire ...

Wildfire smoke was helping raise ozone to hazardous levels. No alerts have been issued, but the air quality may approach “code orange” levels again late Thursday afternoon in parts of the region, as ...

More than 200 wildfires are raging across Canada, sending a thick blanket of choking smoke through the U.S. Midwest. Experts says climate change means U.S. residents better get used to it.

As Canada’s wildfire smoke creeps down into the U.S., it’s also transforming. Chemical reactions between gases and sunlight create ozone, which further exacerbates lung conditions like asthma.

More than 200 wildfires are raging across Canada, sending a thick blanket of choking smoke through the U.S. Midwest. Experts says climate change means U.S. residents better get used to it.