Four Republican members of Congress have accused Canada of insufficient action to prevent wildfire smoke from drifting into the United States, calling the situation "unacceptable" in a joint letter to the Canadian prime minister. The lawmakers from Michigan stated that their "patience has run out" and warned that the U.S. might consider direct involvement in cross-border wildfire protection if Canada does not take more decisive measures.

As of Friday, Canada was experiencing over 890 active wildfires, with the majority burning out of control. Nearly 3 million hectares of land have been destroyed, according to the Canadian Wildland Fire Information System. Over 190 of these fires are in Ontario, some of which are uncontrolled.

The resulting smoke has spread across numerous U.S. states, including Minnesota, Michigan, Pennsylvania, Ohio, and New York, leading to "hazardous" air quality alerts and the cancellation of outdoor events. On Friday, air quality in Detroit was reported as the worst globally by Swiss tracker IQAir, with Chicago, Washington D.C., and New York also experiencing significantly degraded air quality.

The Republican representatives specifically cited "chronic under-investment in forest thinning, fuel reduction, and prescribed burns, along with inadequate enforcement against arson" as unaddressed issues. They claimed that assurances of urgency from the previous year had not materialized, and that "American lungs are paying the price for Canadian inaction, year after year."

Canadian officials, however, have emphasized a shared responsibility for climate change. Canadian leader Mark Carney stated that climate change is a global issue and "truly everyone's responsibility—including the United States." He also noted ongoing communication with Canadian provinces and local communities regarding the situation.

Scientists suggest that the issue is complex, with weather patterns playing a significant role in smoke dispersal. Dr. Patrick James from the University of Toronto noted that "weather doesn't care about international borders," and that smoke from U.S. wildfires has also impacted Canada in past years. Experts also point out that many current fires are in remote Canadian forests, making them difficult to contain early on. While improved forest management can help near communities, it may not prevent fires across vast ecosystems.

Scientists also link increasingly severe wildfire seasons to climate change, which fosters hotter, drier conditions conducive to fire spread. Dr. Anabela Bonada from the University of Waterloo stated, "Climate change is a global issue, and it would be inaccurate to suggest that Canada alone caused or could have prevented these wildfires."

Ontario Premier Doug Ford defended his government's response, highlighting that over 150 fire crews and 80 water bombers are battling the blazes. He mentioned that the province has spent over a billion dollars on wildland fires since 2018 and routinely allocates additional funds beyond the base budget. Ford also reminded the U.S. of Canada's assistance in battling wildfires in California and responding to hurricanes in North Carolina, suggesting that the U.S. should offer support rather than criticize.

People are silhouetted against the New York City skyline with Brooklyn bridge and the river in view, and a hazy smokey sky, in Brooklyn on 16 July. The sun is shrouded by smoke from wildfires in Canada as it rises behind the skyline of midtown Manhattan, the Chrysler Building and Empire State Building in New York City on June 11, 2025, as seen from Jersey City, New Jersey