Smoke From Canadian Wildfires Triggers Health Alerts Across 3 U.S. States

Air quality alerts were issued across Michigan, Minnesota, and South Carolina on Monday, warning millions about potential health risks due to smoke and pollution.

What’s happening

Officials say children, the elderly, and people with respiratory conditions face serious health risks when air quality worsens. Particulate matter from wildfire smoke can worsen asthma, trigger heart problems, and lower lung function in developing children.

In Michigan and Minnesota, smoke from Canadian wildfires is the main concern. The National Weather Service (NWS) said smoke from fires in Manitoba and Saskatchewan is spreading south due to a cold front.

Counties in Michigan under alert include Mackinac, Chippewa, Menominee, Marquette, and others. Minnesota is facing a statewide alert.

“This will be a long-duration event with multiple rounds of smoke expected,” the NWS said.

People are being advised to:

• Avoid outdoor activity, especially strenuous exercise.

• Stay indoors with windows closed.

• Use air purifiers if available.

• Avoid outdoor burning and other pollution-causing activities.

South Carolina’s alert was triggered by high ozone levels, which have worsened due to wildfire smoke. Authorities warned that ozone pollution could affect air quality through the evening.

Expert view

Professor Jonathan Grigg, a pediatric respiratory expert from Queen Mary University of London, said air pollution poses lasting harm.

“Children’s lungs are still developing. Exposure to pollutants like smoke can alter that growth permanently,” he said.

He also noted strong evidence linking air pollution to early deaths from respiratory and heart disease.

Minnesota’s alert is expected to last until 6 p.m. Monday, while South Carolina’s extends to 8 p.m. More alerts may follow if additional smoke waves arrive.

Forecasts show smoke could spread further across central and eastern states, including Illinois and Indiana, as the week progresses. Some areas are already seeing a visible haze in the sky and reduced air quality.

Officials urge people to monitor local air quality indexes and take precautions, especially if they are in sensitive groups.

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