Although the majority of wildfires are occurring in western Canada, smoke from these fires has been drifting eastward, impacting air quality in areas around the Great Lakes and the U.S. Northeast, shows AirNow, the Environmental Protection Agency's interactive air quality map.

Michigan's air, which has been tainted for several days by wafting smoke from Canadian wildfires, is expected to improve over the weekend, state officials said. But don't breathe too deep a sigh of relief, experts warned: Conditions could decline again early next week.

In the upper Midwest of the United States, Michigan, Wisconsin and Minnesota have issued air quality warnings as smoke from the Prairie wildfires is dragged south by a cold front. Those warnings expanded into the Northeast, causing some hazy skies.

An air quality advisory is expected to remain in effect until noon June 6 as Michigan continues to see effects of Canadian wildfire smoke.