Smoke produced by hundreds of wildfires burning across Canada has drifted thousands of miles and nearly circled the entire ...

In letters expressing outrage and indignation, Republican lawmakers are demanding more forest thinning, prescribed burns and ...

With hundreds of wildfires burning across Canada, smoke has drifted into the northern United States, lowering air quality ...

Hundreds of wildfires still burning in Canada are expected to undermine air quality across the Upper Midwest and Northeast ...

The Midwest saw some of the worst air quality conditions in the world Thursday, and similar conditions are expected to persist for several days.

Smoke from Canadian wildfires hovered over several Midwestern states Saturday, bringing warnings of unhealthy air ...

Smoke from wildfires blazing across Canada is once again wafting over huge portions of the U.S. Midwest and worsening air ...

Some Team P.E.I. athletes are back on the Island after taking part in the Canada Games, where their competition was ...

Heavy surface smoke from wildfires in Canada is drifting across Minnesota on Monday, with unhealthy air quality levels ...

Canadian wildfires burning across northern Manitoba and Saskatchewan are sending smoke through central Canada, the Great ...

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.

This isn’t just a local story. Wildfire smoke from Canada is affecting major U.S. cities from New York to Minneapolis. And those most affected, of course, are in Canada.