The Minnesota Pollution Control Agency has issued an air quality alert for most of Minnesota due to wildfire smoke.   The alert, which leaves out the North Shore of Lake Superior, is in effect until Friday afternoon.  Unhealthy particle levels from wildfire smoke is expected to remain for the time being due to northerly winds. Sensitive groups, like the elderly and those with respiratory diseases, are advised to take certain precautions.  More information can be found online on the MPCA’s Air Quality Index webpage.