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

The National Weather Service’s Chicago office attributed the alert to unhealthy ozone levels and lingering effects of smoke ...

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

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

Multiple U.S. states and Canadian provinces are experiencing poor air quality from wildfire smoke. Here's where.

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

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

An Air Quality Alert has been issued through Tuesday for the Chicago area from wildfire smoke coming in from Canada.

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

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

Chicago faces a heat wave with poor air quality due to wildfire smoke and ozone; temperatures may hit mid-90s.