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Smoke from Canadian wildfires prompts air-quality alert across Chicago
The Chicago area recorded ozone levels of 156 late Monday afternoon. Levels above 100 are considered unhealthy. Residents with respiratory issues, children and the elderly are advised to stay indoors and limit exposure to air outside until Tuesday evening.
The AQI in hazy Chicago reached 250 on Tuesday afternoon. Any number over 100 is considered unhealthy for sensitive groups. Haze obscures the Chicago skyline, June 27, 2023.
The reported issues came just as Chicago’s air quality was ranked among the worst in the U.S. According to the 2025 State of the Air Report, released by the American Lung Association on ...
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