Smoke from Canadian wildfires is leading to very unhealthy air quality for much of Michigan, including all of Southeast Michigan. As of noon Thursday, Detroit has the fifth-worst air quality in the world.

Smoke from wildfires is expected to cause poor air quality and reduced visibility in Renfrew County, according to an alert issued by Environment Canada on Thursday.

Smoke from Canadian wildfires continues to plague the Upper Midwest and Great Lakes region, with multiple states under air quality alerts.