An air quality alert remains in effect for the entire state of Minnesota on Monday. Smoke from Canadian wildfires prompted the alert, which is set to expire at 9 a.m. Tuesday. The northern half of the state will likely see the worst air quality.

The return of wildfire smoke from fires burning in Canada has sparked another air quality alert in Minnesota, which will be in effect through Tuesday. The Minnesota Pollution Control Agency has placed the northern two-thirds of the state in the red alert zone, which means "unhealthy" for all residents, through 9 a.m. Tuesday.

An air quality alert has been issued for all of Minnesota, starting at 9 a.m. Sunday and continuing until 9 a.m. Tuesday, according to the Minnesota Pollution Control Agency. The alert is due to heavy smoke from wildfires across central Saskatchewan and Manitoba on the back of a low pressure area.