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Chicago Has Worst Air Quality Among World's Major Cities On Thursday

COOK COUNTY, ILLINOIS, AUG 1 – Unhealthy particle pollution from Canadian wildfire smoke has forced extended alerts, with Chicago briefly recording the world’s worst air quality on Thursday, officials said.

  • On Thursday, the National Weather Service extended an air quality alert for the entire Chicago area through Friday night due to wildfire smoke particulates.
  • A stagnant high-pressure system trapped smoke largely originating from fires in Saskatchewan and Manitoba across the Midwest, according to the Post.
  • At 1pm Thursday, Chicago’s AQI reached 174, worse than the Democratic Republic of the Congo and Dubai, according to AirNow.
  • Amid unhealthy air, the National Weather Service urged residents to reduce outdoor activities and avoid prolonged exposure, especially for vulnerable groups.
  • Hazy skies could persist through Saturday as more smoke arrives from Canada with north winds continuing, according to forecast models.
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Chicago Sun TimesChicago Sun Times
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Chicago officially recorded the worst air quality in the world for a few hours on Thursday. As a cloud of smoke from Canadian wildfires blanketed the metropolitan area, no other major city in the world recorded air pollution worse than Chicago's at midday Thursday, according to a global ranking by IQ Air, a Swiss air technology company. "Air quality is officially hazardous in Chicago," says Brian Urbaszewski, director of environmental health pro…

·Chicago, United States
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WFLD broke the news in Chicago, United States on Thursday, July 31, 2025.
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