Wildfires in Canada lead to a statewide air quality advisory in Michigan, with Detroit's air ranking among the worst globally.

The summer of 2025 has brought some of the worst air quality ever recorded to large parts of the United States. Cities across the Midwest and Northeast—especially Chicago, Detroit, Cleveland, New York City,

Hundreds of wildfires still burning in Canada are expected to undermine air quality across the Upper Midwest and Northeast into Tuesday. At least 738 wildfires are currently burning in Canada, with at least 201 out of control, according to the Canadian Interagency Forest Fire Centre.