Story perspectives
Chicago AQI tops 750 as Canadian wildfire smoke forces closures
7/20/2026
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Story summary
- Chicago recorded an AQI above 750 on Thursday, the worst for any city.
- The National Weather Service extended the alert through Monday because Canadian wildfire smoke kept AQI unhealthy.
- Illinois EPA and Chicago Park District closed beaches, pools and moved camps indoors.
- Health experts warned fine particles can cause heart and lung problems and urged N95 masks.
- Smoke forced the postponement of a Chicago Fire soccer match and cancelled concerts.
