Another large fire exacerbated by climate change is threatening the health of Chicagoans. Government officials issued an air pollution "action day" on Thursday.

CHICAGO (CBS)-- Smoke pouring down from Canadian wildfires has created air quality so bad that Chicago's was deemed the worst on Earth Tuesday. Shortly before noon, the poor quality of air in the ...

Chicago and Detroit held the top two rankings for worst air quality in the world, according to IQAir’s Air Quality Index. The two Midwest metropolitans alternated between the "unhealthy" and ...

Canadian wildfires brought some of the worst air quality in the world to Chicago last week. Since then, the AQI has gotten a bit better, but this does beg a couple of questions: How do I keep myself ...

Chicago's poor air quality issues have persisted since Tuesday, when the city ranked in the No. 1 spot for the worst air quality in the world, according to the World Air Quality Index.

Why is it smoky in Chicago today? Wildfires are to blame for the city's air quality - among the worst in the world Tuesday. Check our map for updates.

Chicago's air quality entered "very unhealthy" territory just before noon Tuesday and continued to rise. Previously, the PM2.5 -- an air pollutant also known as fine particulate matter, ...

An air quality alert is in effect until midnight Thursday for the Chicago area as Canadian wildfires continue, officials said. The Illinois Environmental Protection Agency declared an Air ...

The readings arrived just as the American Lung Association issued its annual State of the Air report, which suggests that even days with good air quality in Chicago may be hard on the lungs.It ...

Users across Chicago were met Wednesday with warnings from their smartphones about the city’s air quality that led to much confusion, but was the air quality actually that bad? Across social ...

Chicago records worst air quality in the world from Canada wildfires 00:18. Chicago, Milwaukee and Detroit had some of the worst air quality in the world Tuesday as wildfire smoke from Quebec ...