MINNEAPOLIS (WCCO) – Smoke from Canadian wildfires is making for another weekend of poor air quality.

The Minnesota Pollution Control Agency (MPCA) issued an air quality alert Thursday afternoon for nearly all of northern Minnesota, stretching from Moorhead to Milles Lacs, and from Duluth to Grand Portage.

READ MORE: Driver Dies After Crashing Into Utility Pole In South Mpls.

The alert will be in effect until noontime Sunday.

READ MORE: 'A Beautiful Journey': Lynx Forward Napheesa Collier Expecting First Child

Unhealthy air quality can affect children and the elderly, people with asthma or respiratory problems, and those who suffer from heart disease or high blood pressure.

MORE NEWS: Conner Rhoades, 21, Reported Missing In Brooklyn Park

Those at risk are encouraged to take fewer car trips, stay away from bonfires and keep their inhalers,if they use them, nearby.