Trump Says Canada 'Poisoned' US Air with Wildfires, Floats New Tariffs President Donald Trump has again sparked diplomatic tensions by claiming that Canadian wildfires are "poisoning" the US air.
This assertion, made in a recent tweet, is not surprising given the long standing trade disputes between the two nations.
The science on wildfires and air pollution is clear: these events are natural occurrences in regions prone to drought and heatwaves, such as Western Canada.