A gray haze from wildfire smoke could be seen in Cincinnati, and the entire state of Minnesota is under an air quality alert.

Wildfires in Canada have forced thousands of residents to evacuate in three provinces, impacting air quality in the U.S. — and smoke from the deadly fires has even blown across the Atlantic and reached the U.

Wildfire smoke is spreading throughout Central Canada and into parts of the U.S., with air quality warnings being issued in both countries.