Heavy smoke from wildfires blazing in Canada and Minnesota engulfed large swaths of the Midwest and Northeast U.S. this week, impacting air quality and exposing millions of people to hazardous levels ...

Donald Trump plans to increase tariffs on Canadian imports to cover the “incalculable” cost of pollution caused by forest fires sweeping across the northern border.

Detroit had the worst air quality of any city in the world ‌on Thursday, according to monitoring company IQAir, with a reading of 600, twice the level considered "hazardous" by the U.S. Environmental ...