Sensitive groups are advised to stay indoors and limit outdoor activities as pollution and ozone levels spike to unhealthy ...

The 'unhealthy for sensitive groups' air quality in Chicago comes as an air quality alert was issued for the entire state of Wisconsin.

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

Besides temperatures feeling in the high 90s, Chicago and surrounding areas are under an air quality alert until midnight, ...

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

As of 9 p.m., Chicago retained the distinction of having the world's worst air quality, with an air quality index of 175. Detroit came in second with 171, according to IQAir.

Why is it smoky in Chicago today? Wildfires are to blame for the city's air quality - among the worst in the world Tuesday. Check our map for updates.

Early Wednesday morning, Chicago moved to the third worst air quality in the world, behind Dubai and Detroit. High ozone levels also contributed to Chicago's poor air.

Air quality map: Detroit, Chicago among Midwest cities impacted by Canadian wildfire smoke Gabe Hauari USA TODAY 0:00 ...

An Air Quality Alert has been issued for the entire Chicago Area. Counties included in the alert are Cook, Dupage, Grundy, Kane, Kendall, Lake (IL), McHenry and Will and lasts through Monday night.

Chicago experiences poor air quality from western U.S. wildfires every year — a result of climate change — though that usually happens much later in the summer.