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.

Wildfire smoke returns to Minnesota on Sunday, sweeping in from the northwest to the southeast.

Air quality forecast for August 11th from the MPCA predicts unhealthy air for everyone in the northern half of Minnesota.