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

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

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

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

Unhealthy air has invaded Minnesota, Wisconsin and North Dakota early this week as a new round of wildfire smoke from Canada ...

The alert comes as humidity is expected to increase Tuesday, with high temperatures in the mid 80s to low 90s, with heat indices reaching 100 by Wednesday.

An air quality alert was issued Thursday by the National Weather Service for the entire Chicago area through Friday night.

Low: 68.   Tuesday opens with plenty of sunshine but some cottony cumulus clouds arrive on the scene by/during the ...

The Independence Day holiday will open with fairly extensive cloud cover and chances for showers, but expect skies to clear ...

Canadian wildfire smoke descended into the Upper Midwest again on Monday, heightening the risk of physical health impacts.

Heavy-duty vehicles contribute significantly to the two things that have gained notoriety for exacerbating urban air ...