Much of Ontario remains under special air quality statements or warnings today amid smoke from wildfires burning in other parts of Canada.

Wildfire smoke in Ontario has dropped air quality to poor levels, but it will finally improve come Sunday as the centre of ...

Quebec joined southern Ontario locations on the list of record breaking air quality levels to finish the week. Montreal even topping the list for the worst air quality on Earth for major cities ...

Smoke from wildfires burning in northern Ontario and the Prairies of Canada caused poor air quality and reduced visibility in ...

More than 200 wildfires are raging across Canada, sending a thick blanket of choking smoke through the U.S. Midwest. Experts ...

Parts of Canada are seeing some of their most unhealthy air yet, and the smoke is likely to move over the United States again ...

Toxic metals, including arsenic, could be released by Canadian wildfires, posing health risks to those downwind.

Smoke will likely be an ongoing health hazard across North America for the next few months. Here's what to expect.

Canadian wildfires continue to burn, and plumes of smoke linger over Michigan. Air quality advisories, alerts on June 5.

The country's legacy of mining means that toxic metals could be carried along plumes of smoke, endangering people in its path ...