The Illinois EPA said it reviewing the proposal to rescind the declaration issued back in 2009 under President Barack Obama.

The Trump administration’s U.S. Environmental Protection Agency proposed on Tuesday revoking a science-based determination ...

The “endangerment finding” is the legal underpinning of a host of climate regulations for motor vehicles, power plants and ...

Q: I prefer to exercise outside, but when the air quality is poor, I'm concerned about the potential health effects. What should I do? Across the country, smoke from wildfires — including ...

Air pollution isn't just bad for your lungs—it may be eroding your brain. In a sweeping review covering nearly 30 million ...

CHICAGO—Cheryl Johnson was watching the news during the worst heat wave in her city’s history when she learned that a man she ...

Air quality in the Chicago area has remained poor for three days in a row, the NBC 5 Storm Team reported Wednesday morning.

An Air Quality Alert has been issued through Tuesday for the Chicago area from wildfire smoke coming in from Canada.

Canadian wildfire smoke obscures the Chicago skyline on June 6. An air-quality alert has been extended to a second day Tuesday as pollution and ozone levels in the Chicago area continue to remain ...

CHICAGO - Today is warm with an air quality alert in effect. Sensitive groups should take it easy again as we have elevated ozone levels close to the ground. Highs will be around 90 this afternoon.

Chicago faces poor air quality and sweltering heat today and tomorrow, followed by scattered storms heading into the weekend.