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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)

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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