The building heat and humidity comes as Chicago's air quality readings early Monday morning were "unhealthy for sensitive groups," the website AirNow.gov said. The air quality ranked as a level three ...

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

The Chicago area recorded ozone levels of 156 late Monday afternoon. Levels above 100 are considered unhealthy. Residents ...

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

The Illinois Environmental Protection Agency has issued an Air Pollution Action Day for Tuesday, July 15. Here's what to know ...

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

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

Today is warm with an air quality alert in effect. Sensitive groups should take it easy again as we have elevated ozone ...

The air quality is poor today in northern Illinois due to migrating Canadian wildfire smoke. See the AQI in your area.

Air quality map: Detroit, Chicago among Midwest cities impacted by Canadian wildfire smoke. ... Air quality index basics: How it works, what each color code means and how to stay safe.

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.

ABC7 Chicago's Air Quality Tracker provides real-time updates on the latest air quality data available from government monitors across the city and the region.