As dozens of wildfires continue to burn across Canada, flames are sending far-reaching plumes of smoke into the sky and unhealthy air to distant places. Some of the more gigantic blazes have been delivering thick smoke that spread southward into the United States over recent days.

According to forecasters at AccuWeather, cities where smoke is expected to become thick enough to be noticeable include Fargo, North Dakota; Minneapolis and Duluth, Minnesota; Green Bay and Milwaukee; and Chicago, Illinois. Additionally, high-altitude wildfire smoke may be visible as far southeast as Detroit and Indianapolis.