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

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.

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 ...

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 ...

The air quality in some parts of southern Cook County, near Tinley Park, Dolton, South Holland and Chicago Heights, was classified as unhealthy for sensitive groups due to a high level of fine ...

Wildfire smoke will filter in from the North overnight, bringing limited visibility and poor air quality to the region tomorrow. Below is a view from some of the smoke overtop of downtown ...