Detroit’s air quality ranks as the worst in the world for the second day in a row Friday as smoke from Ontario wildfires continues to pour into Michigan, although air quality is expected to improve slightly Saturday.
Wildfires burning in Ontario northwest of Lake Superior and in Minnesota have led to dangerously high levels of fine particulate matter, or PM2.5, statewide. The state warns that increased ozone may be an issue on Saturday as well.
The agency extended a statewide air quality alert through Saturday…