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The "unhealthy" air, which ranks as level four of six on the Air Quality Index, comes after multiple consecutive days of air quality alerts.
"The air quality is officially dangerous in Chicago," says Brian Urbaszewski, director of environmental health programs at ...
1don MSN
Air Quality Alert extended through Sunday across Chicago area as Lollapalooza draws thousands
Most of the Chicago area remains under an Air Quality Alert this weekend due to smoke from Canadian wildfires.
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