Trump threatens Canada with tariffs over wildfire smoke | DW News

US President Donald Trump has threatened to impose additional tariffs on Canada, accusing it of allowing wildfire smoke to drift into the United States and calling it an "unnecessary invasion" of polluted air. As hundreds of wildfires burn across Canada -- many of them out of control -- thick smoke has spread across Washington, New York and other US cities, reducing visibility and sending air quality to hazardous levels. In this DW News report we examine the growing political dispute between Washington and Ottawa, the impact on millions of people, and the science behind how wildfire smoke can…

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