Canadian wildfire smoke sparks cross-border tensions - Experts call for climate cooperation
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As wildfire smoke from Canada drifted across the U.S. Midwest this summer, turning skies orange and triggering health alerts, a political storm erupted.
Republican lawmakers from Wisconsin, Iowa, Minnesota, and North Dakota filed a formal complaint with the U.S. Environmental Protection Agency (EPA), accusing Canada of failing to contain its wildfires and demanding accountability for the transboundary haze.
“Our skies are being choked by wildfire smoke we didn’t start and can’t control,” wrote Wisconsin State Representative Calvin Callahan in early August.
Manitoba Premier Wab Kinew swiftly condemned the move, calling it a “timber tantrum” and accusing U.S. officials of playing political games.
The backdrop to this dispute is Canada’s second-worst wildfire season on record. By late September, more than 8.7 million hectares had burned—an area larger than Portugal—with over 500 fires still active, mostly in British Columbia and Manitoba.
A recent study published in Nature revealed the global toll of Canada’s wildfire smoke: more than 87,500 premature deaths worldwide in 2023, including 4,100 in the U.S. and over 22,000 in Europe. The culprit is PM2.5, a fine particulate matter linked to respiratory, cardiovascular, and neurological damage.
“These are big numbers,” said Michael Brauer, a University of British Columbia professor and co-author of the study. “Wildfire smoke should be treated as a serious health issue—on par with cancer.”
Despite the finger-pointing, climate and fire experts say Canada is not solely to blame. “Until we as a global society deal with human-caused climate change, we’re going to have this problem,” said Mike Flannigan, a fire science expert at Thompson Rivers University.
Canada’s boreal forests are naturally fire-prone, and climate change has intensified the threat. Fire seasons now start earlier, end later, and burn more land. Roughly half of Canada’s wildfires are sparked by lightning, while the rest stem from human activity. Hotter temperatures and drier conditions have made ignition more likely and suppression more difficult.
The U.S. has faced its own wildfire tragedies, including the 2023 Hawaii fires and the 2025 Palisades blaze in Los Angeles. Both countries have shared firefighting resources: Canadian water bombers were deployed in California, while over 600 U.S. firefighters assisted in Canada.
Experts argue that solutions like controlled burns, better forest management, and early detection technology can help—but none will eliminate smoke. “We have very difficult fires to manage under extreme conditions,” said Jen Beverly, a wildland fire professor at the University of Alberta. “And we’re seeing more of those because of climate change.”
Beverly also pointed to the U.S.’s role in global emissions. “We should be blaming them for the problem,” she said, noting America’s status as the world’s second-largest carbon emitter.
Environmental policy expert Sheila Olmstead of Cornell University urged a return to bilateral cooperation, referencing the 1991 U.S.-Canada air quality agreement. “That’s what seems to be missing here,” she said. “Both countries would benefit from working together.”
As the EPA reviews the complaint, experts warn that the real threat isn’t political—it’s planetary.
“This stuff isn’t going away,” Brauer said. “We need to learn how to live with smoke—and prevent future deaths through adaptation.”
Photo Credit: Wikipedia Creative Commons License
Downtown Calgary, Alberta, Canada is draped in wildfire smoke - 2023
English: In May 2023 wildfires in northern Alberta, Canada caused significant impact on air quality as thick smoke engulfed areas across Canada and the United States. On May, 17th, 2023, the day this photograph was taken, the Air Quality Health Index from the Government of Canada measured 10+, the highest rating possible.
Date: 17 May 2023
Author: Dwayne Reilander
Read more:
https://www.bbc.com/news/articles/cn4l3j93481o
https://www.nature.com/articles/s41586-025-04567-9
https://ciffc.net/national-fire-situation
https://spph.ubc.ca/faculty/professors/michael-brauer/
https://www.epa.gov/international-cooperation/transboundary-air-pollution