Last week, Canadian wildfire smoke blanketed Wisconsin and caused the Air Quality Index to reach the unhealthy level for sensitive groups. Six days later, on July 31, the smoke appears to have a worse impact on the air.

Wildfire smoke from Canada is blanketing the skies in the Midwest, leaving millions with dangerous breathing conditions.

Duluth, North Shore are in a Very Unhealthy Air Quality Alert, with the rest of Minnesota under a Red AQI. Wisconsin reports very unhealthy conditions on Thursday, July 31.