Most of the Chicago area remains under an Air Quality Alert this weekend due to smoke from Canadian wildfires.

National Weather Service officials issued an air quality alert set to expire at midnight Saturday for the Chicago and ...

Chicago air quality remains in the top five worst in the world Friday with an Air Quality Alert in place from Canadian ...

The hazy skies in the Chicago area are the visible sign of the poor air quality Thursday as smoke from Canadian wildfires ...

"The air quality is officially dangerous in Chicago," says Brian Urbaszewski, director of environmental health programs at ...

National Weather Service officials called an air quality alert in effect until midnight as well as a beach hazard warning.

Wildfire smoke has pushed Chicago's air quality into the "unhealthy" zone. It's so bad, in fact, that we're the most polluted ...

Friday morning, Chicago's air quality showed a PM 2.5 of 157. Typically, anything above 100 is considered to be hazardous to at least some groups, and anything over 150 is considered to be “unhealthy, ...

Chicago's Air Quality Alert continues due to Canadian wildfire smoke, with health advisories for sensitive groups amidst ...

While air quality was in the "unhealthy for sensitive groups" category in Chicago, it was even worse in some suburbs.

An Air Quality Alert was still in effect for a third straight day, but for a smaller portion of the Chicago area.

An air quality alert covering the entire state of Minnesota continues on Thursday, marring otherwise fairly ideal weather ...