An air quality alert was issued Thursday by the National Weather Service for the entire Chicago area through Friday night.

Air quality problems increase today and tomorrow as steamy, stagnant air leads to higher levels of ozone pollution.

Chicago air pollution among the worst in the US, new report finds As for temperatures, late August has historically not been as hot as this week. The hottest Aug. 27 on record at O’Hare Airport ...

After hundreds of complaints, citations, and a class-action settlement, city inspectors’ notes show instances where MAT ...

Chicago also ranked poorly by another measure of air quality: particle pollution. The metro area ranked 19th in the nation for annual average pollution by fine particles.

Chicago also ranked poorly by another measure of air quality: particle pollution. The metro area ranked 19th in the nation for annual average pollution by fine particles.

"As soon as the rule was released, the EPA employees started talking about how terrible this was going to be for the state of Illinois," said Nicole Cantello, president of AFGE Local 704, the union ...

And not only did the air quality in the Chicago metropolitan area receive a failing grade for unhealthy levels of ozone and particle pollution, but so did 23 counties (where data was available ...

Chicago is building what climate scientists say could be the country’s best system for monitoring tailpipe pollution from diesel trucks. But even though the air monitors have arrived, the city ...

The Illinois Environmental Protection Agency declared an Air Pollution Action Day today in the Chicago Metropolitan area due to elevated particle pollution caused by Canadian wildfire smoke.. Here ...

At the Sustainability Research and Innovation Congress in downtown Chicago this week, global leaders gathered to focus on solutions for making transportation more sustainable and better for the ...