The state of Minnesota is entering another in a long string of summer days marred by air quality alerts. Poor air quality will continue through Saturday with lingering wildfire smoke from Canada.

Smoke from Canadian wildfires continues to choke the skies over the Upper Midwest this weekend, with the milky haze even starting to spread south into the Ohio and central Mississippi valleys -- and even into Oklahoma.

Air quality warnings covering the whole state are expected to remain in place through Saturday due to Canadian wildfire smoke.