Ontario wildfire smoke spreads across U.S. Northeast

2 min readUpdated July 15, 2026

Smoke from wildfires raging across Ontario reached New York City and spread throughout the U.S. Northeast this week, prompting air quality alerts for millions as a heat dome holds pollutants near the surface, according to The New York Times.

Evacuation orders have been issued for at least six rural and First Nations communities in the Thunder Bay region of Ontario, a city situated on Lake Superior not far from the Minnesota border. Namaygoosisagagun First Nation, whose roughly 40 residents departed by boat, was among those displaced. "An entire first nations community has been erased because of this disaster," Sol Mamakwa, an Indigenous member of provincial parliament, posted on Facebook $META, according to The Times.

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The smoke is forecast to reach more than 100 million people in the Midwest and Northeast, according to CNN. As an atmospheric pattern change takes hold, smoke is expected to descend to ground level on Wednesday and Thursday, pushing dangerous air quality conditions across a broad stretch of territory stretching from the Upper Midwest through New England. Much of Michigan, Minnesota, and Wisconsin are under air quality alerts. Among the hazards carried by wildfire smoke is PM2.5, a category of ultrafine particles that lodge in lung tissue or pass into the bloodstream, where they can worsen chronic illnesses such as diabetes and heart disease, according to CNN.

Canada has seen more than 3,000 fires consume close to 4.5 million acres so far this summer, with roughly a dozen of those burning in Ontario over recent weeks, according to CNN. Across the country, the Canadian Interagency Forest Fire Center counts 54 active wildfires; total burned acreage for the year stands at 4.7 million — under a quarter of the 22.2 million acres destroyed in 2025, according to The Times. Ontario Provincial Police reported that flames encroaching on rail lines prompted officials to reroute three trains hauling flammable materials to safer ground, while local governments across the region have prohibited campfires and other open burning.

Ontario wildfires send smoke across U.S. Northeast as heat dome traps air near ground

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