Following a period of heavy wildfire smoke in Ontario, daily ED visits for asthma-related causes rose and stayed up for ...

With wildfire smoke looming over Ontario, Environment Canada has issued air quality watches and statements for a large ...

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

Wildfires are already burning in parts of Canada, and as they do, many communities are already facing the familiar thick haze ...

We’re finally on track for a brief breather from the wildfire smoke that’s gripped southern Ontario for the past four days.. A wind shift moving into the region Monday will help flush out some ...

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

Smoke will likely be an ongoing health hazard across North America for the next few months. Here's what to expect. ... particularly in northern Ontario and the western provinces.

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.

Smoke from wildfires in Canada has spread more than 5,000 miles, ... Illinois, Indiana, Iowa and Wisconsin, as well as Ontario and Quebec, Canada, on Friday. ...

We’re finally on track for a brief breather from the wildfire smoke that’s gripped southern Ontario for the past four days. A wind shift moving into the region Monday will help flush out some of the ...