Canadian wildfires in Ontario have triggered mass evacuations and sent hazardous smoke across parts of the US and Canada, causing unhealthy air quality, health warnings, and precautionary measures in cities including New York, Chicago, Detroit, Minneapolis, and Toronto.

Over 800 wildfires are burning through forests in Canada, prompting heavy smoke warnings for millions of Americans.

Wildfires in Canada are pouring thick clouds of smoke into the US and will usher in unhealthy air quality for millions of people in Northeast and Midwest.

A massive plume of smoke from wildfires burning across Canada has swept into the United States, degrading air quality across the Midwest, Northeast and Mid-Atlantic.