MINNEAPOLIS – Unhealthy air has invaded Minnesota, Wisconsin, Michigan and North Dakota early this week as a new round of wildfire smoke from Canada has wafted into the region, choking areas as far south as Chicago and Detroit.
The FOX Forecast Center is tracking heavy ground-level smoke from Canadian wildfires moving into the U.S. early this week, delivered by northerly winds behind a cold front.
On Monday morning, some of the worst air quality in the U.S. was reported over the Upper Midwest and Great Lakes regions, for cities including Duluth, Minnesota, and Marquette, Green Bay and Milwaukee in Wisconsin…