Air quality in the Chicago area has remained poor for three days in a row, the NBC 5 Storm Team reported Wednesday morning.

The Illinois EPA declared an Air Pollution Action Day in the Chicago metro area. See today's air quality index forecast for Illinois.

CHICAGO (CBS)-- Smoke pouring down from Canadian wildfires has created air quality so bad that Chicago's was deemed the worst on Earth Tuesday. Shortly before noon, the poor quality of air in the ...

Chicago faces poor air quality and sweltering heat today and tomorrow, followed by scattered storms heading into the weekend.

Air quality in the Chicago area ranked as “Unhealthy for sensitive groups” early Monday morning as Canadian wildfire smoke once again impacts parts of the Midwest, including Wisconsin and Minnesota. According to the Wisconsin Department of Natural Resources,

As of Tuesday morning, Chicago, Minneapolis and Detroit have the worst air quality conditions among American cities, according to IQ Air's live ranking of major world cities, which ranks them 8th ...

Users across Chicago were met Wednesday with warnings from their smartphones about the city’s air quality that led to much confusion, but was the air quality actually that bad? Across social ...