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

The Indiana Department of Environmental Management said Northwest Indiana’s ozone levels are expected to be unhealthy for ...

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 ...

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

The Illinois EPA declared an Air Pollution Action Day in the Chicago metro area. See today's air quality index forecast for ...

Chicago faces an extreme heat watch with temperatures expected to reach mid-90s and heat indexes up to 115 degrees.

Chicago's air quality alert continues due to Canadian wildfires, affecting sensitive groups and prompting health advisories.

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

Today is partly sunny and hot! Highs will be in the upper 80s and low 90s with the heat index pushing to around 100!

Chicago weather forecast Wednesday includes chance of severe storms; isolated tornado possible Wednesday will be very hot and humid, with highs in the low 90s. Between about 3 and 8 p.m., strong to ...