Illinois EPA: Low air quality may cause tightening of the chest and difficulty breathing for those with respiratory struggles

John Williams

FILE – In this March 19, 2015, file photo, a thick haze of smog looms over the skyline of Chicago. A new study in the Proceedings of the National Academy of Sciences finds that America’s nitrogen oxides levels, a key ingredient in smog, aren’t falling as fast as they used to and may be leveling off. The Monday, April 30, 2018, study means that when tighter new air quality standards go into effect later this fall, more cities may find themselves on federal’s dirty air list. (AP Photo/Nam Y. Huh, File)

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Illinois Environmental Protection Agency Public Information Officer Kim Biggs joins John Williams to explain the science behind the seventh day in a row of low air quality in Chicago. Kim shares how people will notice the change in air quality and who should stay cool.

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