Canada Wildfire Smoke
Wildfire smoke from Ontario and western Canada worsens air quality across the U.S. and Canada.
Summary
Smoke from more than 830 wildfires burning across Canada spread into the U.S. Midwest, Great Lakes, Northeast and Mid-Atlantic on Wednesday, triggering air quality alerts for millions. More than 100 fires in northern Ontario drove Toronto’s air quality to the worst ranking in the world, and Environment Canada issued health warnings as smoke turned skies yellow. Authorities ordered evacuations and closed roads in northern Ontario; more than a dozen fires also burned in northern Minnesota. Forecasts showed heavy smoke could affect up to 100 million Americans through Friday before shifting and gradually improving in some areas.
Coverage Angles
U.S. Smoke Threat
Center & RightCanada’s wildfires have become an American public-health emergency as smoke spreads from the Great Lakes into the Midwest, Northeast, and New England. Millions of people in the U.S. are being exposed to unhealthy air and smoky skies because of fires burning across the border.
Canadian Fire Emergency
Center & RightNorthern Ontario is facing a major wildfire crisis, with nearly 200 fires forcing evacuations and road closures. The flames are threatening communities and infrastructure so severely that even trains have been caught in fire zones.
Urban Air Alarm
Mostly LeftThe danger is no longer remote when cities like Toronto and parts of the eastern U.S. see orange skies and some of the worst air quality in the world. The smoke is turning the wildfire season into an immediate urban health crisis for people far from the flames.


