Minneapolis, MN – Millions of residents across the Midwest are under air quality alerts Thursday as dense wildfire smoke from Canada spreads across the region, prompting advisories ranging from Unhealthy for Sensitive Groups to Hazardous air quality in several states.
According to state environmental agencies, air quality alerts are in effect across much of Minnesota, northern Illinois, northern Indiana and portions of Ohio as smoke continues to move southward behind shifting weather patterns. Some advisories remain in effect through Thursday night, while portions of Minnesota are expected to continue under alerts until Friday morning.
Minnesota is experiencing some of the worst conditions in the region. The Minnesota Pollution Control Agency warned that parts of central Minnesota, including the Twin Cities metro, could reach the Maroon (Hazardous) category on the Air Quality Index, while other areas may remain in the Red or Unhealthy category. Officials also reported minor ashfall in some locations as dense smoke lingers over the state.
Northern Illinois, including the Chicago and Rockford metropolitan areas, is under a Red Air Pollution Action Day as a thick plume of wildfire smoke pushes into the region. Officials say changing wind patterns could cause air quality to fluctuate throughout the day and into Friday. Northern Indiana is also experiencing elevated fine particulate pollution and ozone levels, with residents urged to reduce prolonged outdoor exposure.
Across Ohio, statewide and regional air quality advisories remain in place as Canadian wildfire smoke combines with localized ozone concerns. Several areas are forecast to reach the Unhealthy for Sensitive Groups category, while northeastern Ohio faces a Maroon-level advisory in some locations.
Health officials recommend limiting strenuous outdoor activity, especially for children, older adults, people with asthma, heart disease or other respiratory conditions, and those who work outdoors. Residents are also encouraged to keep windows closed, use air conditioning on recirculate if available, and monitor local AirNow forecasts before spending extended time outside.
