More episodes of wildfire smoke are in the offing for parts of Canada and the midwestern and northeastern United States.

Prevailing winds will direct more wildfire smoke from western Ontario into the Midwest and Northeast often well into August.

Wildfire smoke contains tiny particles that can be dangerous to your health, and scientists are comparing inhaling wildfire smoke to smoking cigarettes. PM2.5 is mostly produced from combustion ...

While the skies over Toronto are looking clearer, Environment Canada still has an air quality warning in place. On 9 a.m. Friday, exposure to the air for a 24-hour period carried roughly the same ...

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The interplay between the burning fires, the smoke itself and quickly changing weather patterns is making the next few days more uncertain than usual. By Judson Jones Meteorologist See more of our ...

Canadian wildfire smoke is drifting across parts of the U.S., prompting doctors to warn that even healthy people may face risks from prolonged exposure to polluted air. More than 180 wildfires are ...

A version of this story was originally published on Jan. 8, 2025. It has been updated to reflect the wildfires currently bringing smoke to the U.S. Smoke from wildfires in Canada and Minnesota ...

Thick, choking plumes of smoke from wildfires in Canada are pouring into major cities across the Midwest, Northeast and mid-Atlantic, bringing dangerous air quality to more than 100 million people.

Wildfire smoke from fires burning in Canada and northern Minnesota has been pouring across the Great Lakes and northeastern U.S. states, turning skies an eerie shade of orange. In the West, smoke has ...

Heavy smoke continues to spread across the Great Lakes region into New England and as far south as Maryland, leading to unhealthy and even hazardous air quality in a number of states. Extreme heat and ...