Air quality alerts have been issued across most of the Midwest, and hundreds of wildfires are burning across Canada.

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

Wildfire smoke from Canada is blanketing the skies in the Midwest, leaving millions with dangerous breathing conditions.

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

CHICAGO (WLS) -- Most of the Chicago area remains under an Air Quality Alert on Saturday due to smoke from Canadian wildfires ...

Chicago was listed as the worst air quality in the world for part of Aug. 1 because of smoke from the fires blowing southeast ...

CHICAGO (WLS) -- Air Quality Alerts remain in effect for the Chicago area Friday due to smoke from Canadian wildfires.

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

Smoke from Canadian wildfires settled over Chicago Thursday, with air quality reaching “unhealthy” levels for everyone. Air ...

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

Chicago officially had the worst air quality in the world for a few hours Thursday. As a haze of Canadian wildfire smoke ...