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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.
Most of the Chicago area remains under an Air Quality Alert this weekend due to smoke from Canadian wildfires.
Wildfire smoke has pushed Chicago's air quality into the "unhealthy" zone. It's so bad, in fact, that we're the most polluted ...
Minneapolis had the fifth worst air quality among 125 cities worldwide on Saturday morning, according to an international air ...