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

Continued drifting of wildfire smoke from Canada and Alaska has prompted Bay Area air regulators to extend an air quality ...

Wildfires have been raging along the West Coast and in Canada for most of the spring and summer. For some U.S. residents, ...

Many fires burning across Canada, forcing evacuations and threatening air quality in the United States, cannot simply be put out, authorities and experts say.

Wildfires scorching several Canadian provinces have driven at least 33,400 people from their homes, with smoke now reaching all the way to Europe.

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.

A wildfire in central California's wilderness rapidly expanded Thursday as hot, dry conditions heightened fire risks ahead of ...

P lenty of research shows that respiratory distress and heart attacks spike in the event of smoke exposure; acute impacts of ...

Health researchers are studying respiratory impacts as climate change makes wildfires more frequent and intense across the ...

Canada still has time to lead — not just in firefighting, but in foresight. To invest in our forests, respect our waters, ...

Firefighters across the Final Frontier are working to contain dozens of blazes that have forced evacuations and occasionally ...