Designations of Areas for Air Quality Planning Purposes; Pennsylvania, New Jersey, Maryland, Delaware; Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE 2015 8-Hour Ozone Nonattainment Area; Reclassification to Serious

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Under the Clean Air Act (CAA or the "Act"), the Environmental Protection Agency (EPA) is granting a request from the Commonwealth of Pennsylvania and the States of New Jersey, Maryland, and Delaware to reclassify the Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE ozone nonattainment area from "Moderate" to "Serious" for the 2015 8-hour ozone national ambient air quality standards (2015 ozone NAAQS).