An air quality alert for northwest Minnesota has been extended to cover the entire state and run through Monday.

Summer heat will return to the Twin Cities on Monday as air quality concerns linger for parts of Minnesota. The week will start dry and warm, with highs near 90 in the metro. The northern half of the state remains under an air quality alert through 6 p.m. due to Canadian wildfire smoke, the National Weather Service said.

Northern Minnesota and northern Wisconsin remain under an Air Quality Alert Monday due to wildfire smoke. Conditions are unhealthy for the public.