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US President Donald Trump accused Canada of willful negligence in forest management after smoke from raging wildfires blanketed cities from Detroit to New York. In a Truth Social post the president described the influx as an invasion by filthy polluted and unhealthy air that was costing the United States billions of dollars. Trump said he would call Prime Minister Mark Carney to demand an explanation and indicated the pollution costs would be added to existing tariffs on Canadian goods according to reports from BBC News and Al Jazeera.
Canadian authorities reported 888 active fires burning across the country as of July 17 with the majority out of control and more than 190 in Ontario alone. Nearly three million hectares have already burned this season the Canadian Wildland Fire Information System figures show. The fires have prompted evacuations of at least 10 communities in northern Ontario including the Namaygoosisagagun First Nation which residents said was levelled by flames according to the BBC account.
Smoke drifted south triggering hazardous air quality alerts in 18 US states and the District of Columbia. CNN data placed more than 100 million people under such alerts with Detroit recording the world’s worst air quality followed by Chicago and Washington on July 17 per IQAir monitoring. Outdoor events were cancelled in several cities air travel faced delays and residents were advised to stay indoors or wear masks as the haze obscured landmarks in New York and the capital a Reuters dispatch noted.
Ontario Premier Doug Ford urged the United States to send firefighting assistance rather than complaints pointing out that Canadian crews had aided American efforts during California wildfires and North Carolina hurricanes. Ford said the province had deployed more than 150 fire crews and over 80 water bombers and helicopters while spending more than one billion dollars on wildland fire management since 2018. Prime Minister Mark Carney stated that climate change is everyone’s responsibility including the United States and confirmed the federal government remained in close contact with affected provinces.
The episode has strained already tense trade relations after Trump imposed tariffs on Canadian imports last year with no new comprehensive deal yet in place Al Jazeera reported. Several Republican lawmakers from Michigan signed an open letter declaring patience had run out and warning that the US might explore direct cross-border involvement in fire protection if Canada failed to act on forest thinning and arson enforcement. A group of scientists cited by CBS News and BBC outlets attributed the severity of recent fire seasons to climate-driven hotter drier conditions combined with lightning strikes in remote boreal forests.
Canada has invested roughly 12 billion dollars in forest sustainability and fire prevention programs according to statements from government officials. The 2025 season burned more than 8.8 million hectares ranking as the second-worst on record the Canadian Interagency Forest Fire Centre data shows. This year’s fires continue a pattern in which smoke crosses borders freely as weather systems carry particulates hundreds of miles south exacerbating air-quality problems on both sides of the frontier.
