Smoke from wildfires: Millions of people in North America face dangerous air quality, due to wildfires in Canada

The sun rises over a smoky New York City skyline.

More than 400 active wildfires erupted across Canada Tuesday night, according to authorities, exacerbating a wildfire season that has forced the evacuation of tens of thousands of people, created a sense of anxiety across the country and triggered air quality alerts hundreds of miles south in the United States. The danger from wildfires, which in … Read more