President Donald Trump says he will add tariffs on Canada, blaming Canadian wildfire smoke for worsening air quality across parts of the United States. In statements posted on Truth Social on Friday, Trump accuses Canada’s government of failing to properly manage forests and debris, and he describes the smoke crossing the border as “filthy, polluted, and unhealthy air.” Several outlets report that Trump characterizes the situation as “willful negligence” and argues that the costs of dealing with the smoke should be added to tariffs Canada already pays for Canadian goods.

Reporting across outlets describes heavy smoke from hundreds of Canadian wildfires enveloping a broad area of the U.S., including the Midwest and Northeast, and notes public health warnings for residents to stay indoors. Trump also says he plans to contact Canada’s prime minister, Mark Carney, to discuss what action Canada intends to take. Canadian officials are referenced in some coverage, including statements about spending on forest sustainability. The overall accounts describe a diplomatic dispute driven by transboundary air pollution concerns following wildfire activity in Canada.