President Donald Trump said he would increase tariffs against Canada over the wildfire smoke causing poor air quality in some parts of the U.S., though it's unclear exactly what mechanism or authority ...

On Friday, President Donald Trump threatened to raise tariffs on Canada, blaming the country’s worsening wildfires for sending hazardous smoke across the U.S. and accusing Ottawa of failing to ...

Canadian leader Mark Carney says both countries have a responsibility to fight climate change.

President Donald Trump is threatening to charge tariffs to Canada over record levels of hazardous air drifting into the U.S. from hundreds of wildfires burning in the north.

US President Donald Trump has blamed Canada for wildfire smoke drifting into the United States and threatened consequences. The cost of the pollution "must of necessity be added to the TARIFFS Canada ...

Earlier, Ontario's Premier Doug Ford said America should send support rather than complain as smoke from more than 850 Canadian wildfires blankets parts of the US.

U.S. President Donald Trump is adding his voice to the chorus of Republican politicians who are blaming Canada for wildfire smoke drifting across the border.

Soot from Canadian wildfires blanketed a dozen U.S. states Friday, as government agencies warned millions of Americans to stay indoors.

President Donald Trump on Friday threatened to impose tariffs on Canadian imports over wildfire smoke pouring into the United States.

The US president floated fresh tariff threats linked to a foodborne illness outbreak and smoke from Canadian wildfires, expanding his use of trade measures beyond conventional economic disputes.

US president blamed Canada’s forest management for recurring smoke pollution while Canadian officials cited billions invested in prevention and sustainability.

President Trump is indicating that he may punish Canada over wildfire smoke that’s drifted into the U.S. further inflaming ...