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 ...

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

CHICAGO (WLS) -- An air quality alert was issued by the National Weather Service for the Chicago area. Chopper 7 captured as ...

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 ...

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

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.

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

Wildfire smoke degrades air quality in swaths of Ontario, with Toronto ranking among the worst in the world on Monday.

An air quality alert in the Chicago area will stretch into a third day as pollutants continue to linger in the air at high ...