Heavy snow and difficult travel expected again, heaviest snow in southern Minnesota

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Heavy smoke from Canadian wildfires has prompted the Minnesota Pollution Control Agency to expand 

 originally for northern Minnesota to much of the state. The current alert expires at 6 a.m. Thursday.

Areas under the alert include Hibbing, International Falls, Roseau, Bemidji, East Grand Forks, Moorhead, Brainerd, St. Cloud, Rochester, Mankato, the Twin Cities and the tribal areas of Leech Lake, Red Lake, Fond du Lac, Mille Lacs, Upper Sioux and Prairie Island. 

Fine particle levels are expected to be unhealthy for sensitive groups, such as people who have asthma or other breathing conditions, during this time, the MPCA said. The smoke will remain over the region through Wednesday. when winds push the smoke north and out of Minnesota, the agency said. 

, rangers worked to reach campers spread across a vast swath of the Boundary Waters Canoe Area Wilderness that's now closed to visitors amid a growing threat from wildfires. 

Late Saturday, Superior National Forest officials temporarily closed 12 more Boundary Waters entry points and the lakes, campsites, portages and trails they serve north and northwest of Ely.

Added to a previous closure in place along the international border, the closure area now stretches east nearly to Basswood Lake, west almost to Crane Lake, and south to the Echo Trail.

The area is being cleared of canoeists and hikers as a precaution as wildfires continue to burn unchecked just north of the border, in Ontario's Quetico Provincial Park. The fires were active over the weekend and the ongoing drought is making fire conditions more volatile — adding to the risk Quetico fires may cross into the BWCA.

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State pollution control officials have extended the alerts through Thursday morning, and increased the range from as far north as Roseau down to the Twin Cities region, as well as Rochester and Mankato.

Dan Kraker | MPR News

A map covering much of Minnesota shows the effected air quality alert.

Air quality alert expanded across Minnesota over Canadian wildfire smoke

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