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

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 ...

PM2.5 pollution is spiking in many counties in Utah and is accompanied by the typical summer pollutant of ozone. It makes for ...

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

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 ...

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

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

An air quality alert was in effect for the Chicago area and northwest Indiana Tuesday as poor air quality from unhealthy, elevated ozone and lingering wildfire smoke continues. According to the ...

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