Minneapolis, Minnesota’s air quality ranked worst in the world among major cities Thursday due to thick smoke from wildfires burning in the northern part of the state.

Wildfire smoke has settled thickly in parts of New York, Connecticut, Wisconsin, Michigan and Minnesota—and it’s heading further south.

Heavy smoke from several large wildfires blazing in Canada and Minnesota is expected to engulf large swaths of the Midwest and Northeast U.S. this week, exposing millions of…

States warned residents about air quality issues that could last for days