The EPA's Air Quality Index can tell you whether breathing outside air can be harmful. Here's how to read the scale to plan ...

Milwaukee, Ozaukee, Racine, Kenosha and Sheboygan are all under a poor air quality alert from noon to 11 p.m., according to ...

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

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

CLEVELAND, Ohio — Dry and warm weather will peak Tuesday in Northeast Ohio, ahead of rain and thunderstorm chances midweek.

Tuesday’s air quality warning has dropped to a 5, considered a moderate risk, down from Monday’s peak of 10+ on the Air ...

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

The Cram Fire in Northern Jefferson County and now Wasco County is producing significant smoke in the area. The winds from ...

Ontario's poor air quality and hazy skies will persist for the next couple of days for many areas, with widespread alerts ...

With wildfire smoke in the forecast, track the drop in air quality across dozens of PurpleAir sensors with our live, updating ...

Much of Central Canada, Manitoba and Saskatchewan were placed under special air quality statements or warnings on Monday due ...

Canadian wildfire smoke lingers in Michigan. Officials issued an air quality advisory in southeast Michigan for July 15.