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

For a period of time this week, Chicago's air quality ranked as the worst air quality on planet earth. This was caused by smoke billowing south from ...

Canadian wildfires cause Chicago to have the worst air quality in the world. Gov. Pritzker is urged to declare state of emergency for flooded neighborhoods.

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