By David Ljunggren
OTTAWA, July 17 (Reuters) – President Donald Trump on Friday blamed Canada for wildfire smoke spreading across the United States and said he would add the “incalculable cost” of dealing with the pollution to existing tariffs on Canadian goods.
Heavy smoke from hundreds of Canadian fires enveloped a swathe of the U.S. from the Midwest to the Northeast on Thursday and Friday, prompting warnings to residents to stay indoors.
Trump, who has a combative relationship with Prime Minister Mark Carney, said he would be calling the Canadian leader to find out what he planned to do about the “totally unacceptable” situation.
“We are holding Canada responsible for the fact that they are not properly maintaining their Forests … and the United States is being unnecessarily invaded by filthy, polluted, and unhealthy air,” he said in a Truth Social post.
“This is Willful Negligence, and becoming a yearly occurrence, costing the United States Billions of Dollars, which cost of this pollution must of necessity be added to the TARIFFS Canada is currently paying.”
Shortly after taking office in 2025, Trump imposed tariffs on several key imports from Canada, prompting Carney to impose countermeasures.
Carney’s office did not immediately respond to a request for comment. Carney said on Thursday the United States could do more to combat climate change that is leading to warmer and more extreme temperatures around the world.
The two men are likely to meet at the FIFA World Cup final in New Jersey on Sunday.
Most of the blazes are in the giant province of Ontario and are concentrated in the remote and sparsely populated northwest, where the only mode of transport is airplanes. Thousands of people have been evacuated and at least one community has burned to the ground.
So far, 650,000 acres (2,630 sq km) are on fire, compared with 600,000 acres at the same time last year.
Premier Doug Ford on Friday said the province would buy 11 new aircraft to help counter the fast-spreading wildfires and pushed back against U.S. politicians who have criticized the campaign as inadequate.
The United States is experiencing an above-average fire year, with 3.7 million acres burned to date in 2026 compared with a 10-year average of 2.7 million acres, according to the National Interagency Fire Center.
($1 = 1.4012 Canadian dollars)
(Reporting by David Ljunggren; Editing by Deepa Babington, Kevin Liffey and Edmund Klamann)
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