Ozone Levels

Traffic on the Dan Ryan Expressway. (Photo by Tim Boyle/Getty Images)

Chicago Again Gets An F From Lung Association For Poor Air Quality

The Chicago metropolitan area ranked 14th worst in the nation for 24-hour particle pollution – also known as soot – and 20th worst for high ozone levels – also known as smog – and annual particle pollution, according to the Lung Association.

04/30/2014

Weather

Heat, Ozone Levels Prompt Warning For Asthma Sufferers

Sweltering heat and unhealthy ozone levels are on tap for the rest of the day Saturday – a brew that usually is not good news for people with asthma.

CBS Chicago–08/25/2012