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 National Weather Service reported an air quality alert at 8:43 a.m. on Monday in effect until 11 p.m. for Northern Worcester and Southern Worcester as well as Middlesex, Essex, Hampshire, Hampden,