The Michigan Air Quality Division said as smoke from Canadian wildfires continues to threaten the upper Midwest, "monitors in the western (Upper Peninsula) showed a large increase surface concentrations, during Tuesday, as smoke mixed down, which sent PM-2.5 concentrations soaring into the Unhealthy and higher range."

Smoke from Canadian wildfires is leading to very unhealthy air quality for much of Michigan, including all of Southeast Michigan. An air quality alert is in effect for all of Southeast Michigan until noon on Friday.

Canadian wildfires led to Mackinac Bridge in Michigan being shrouded in smoke, prompting visibility and air quality concerns, with Michigan authorities and health officials advising caution and monitoring air conditions.