Chicago records hazardous air quality index amid Canadian and Minnesota wildfires
Data from IQAir shows Chicago's composite AQI reached 402 on Thursday, prompting health alerts and event cancellations as smoke from distant wildfires spreads over the Midwest.
Chicago's air quality deteriorated to a composite index of 402 on Thursday, a level classified as hazardous by experts, according to IQAir data. The reading placed the city among the most polluted major cities worldwide, ahead of Detroit and Minneapolis, with Lahore, Pakistan and New York City also ranking high on the list.
The spike is linked to smoke from wildfires burning in Canada and northern Minnesota, which has drifted southward and affected several Midwestern locations. The National Weather Service extended its air quality alert for the Chicago area through Friday afternoon, noting that smoke concentrations were expected to increase later on Thursday.
The Illinois Environmental Protection Agency advised residents to stay indoors as much as possible. The hazardous conditions also led to the cancellation of a Chicago Fire soccer match against the Vancouver Whitecaps and other regional events. Forecast models suggest the smoke may begin to clear Friday afternoon, though air quality concerns are likely to persist.
"The Illinois EPA has urged residents to remain indoors as much as possible due to the hazardous air quality conditions," the agency said.
Authorities continue to monitor the situation and provide updates through local weather teams.