Haze from Canadian wildfires is seen over Lake Michigan as a person runs along the shoreline Monday in Chicago. Wildfires burning in British Columbia, Alberta, Saskatchewan, Manitoba and Ontario are affecting parts of the United States. (Joshua Lott/The Washington Post)

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.

Rounds of smoke from hundreds of Canadian wildfires, as well as dust blowing off Sub-Saharan Africa, will continue to envelop portions of the United States into the summer, say AccuWeather meteorologists.