U.S. President Donald Trump has threatened to impose additional tariffs on Canadian goods, blaming Canada for wildfire smoke that has drifted across the border and affected air quality in parts of the United States.

Trump accused Canada of failing to properly manage its forests and said the economic cost associated with pollution from the smoke should be added to existing tariffs on Canadian imports. His comments have added a new source of tension to already strained trade relations between Washington and Ottawa.

Smoke from wildfires in Canada has spread across parts of the United States, including areas of the Midwest and Northeast, prompting air-quality warnings and concerns about public health. The situation has also affected outdoor activities and raised concerns about conditions surrounding major events.

Canadian officials have defended the country’s wildfire response and highlighted ongoing efforts to fight fires, protect communities and coordinate with neighbouring jurisdictions. Officials have also pointed to the growing scale and intensity of wildfire seasons as a major challenge.

The latest dispute comes as Canada and the United States continue to navigate wider disagreements over tariffs and trade policy. Trump’s threat to link wildfire smoke to additional economic penalties could further complicate relations between the two countries.

The wildfire crisis remains the central concern for communities facing evacuations, hazardous smoke and pressure on emergency services. At the same time, the political fallout from the cross-border smoke has created a fresh diplomatic challenge for Canadian Prime Minister Mark Carney’s government.

The developments are being closely watched as Canada continues its firefighting and emergency response efforts while Washington considers its next steps on trade.