Revisions of the Nonattainment Designation for the 2008 and 2015 Ozone Standards and Clean
The Environmental Protection Agency (EPA) is approving two separate requests from Maryland and Delaware to revise the designation for the Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE nonattainment area for the 2008 primary and secondary ozone national ambient air quality standards (NAAQS) and the 2015 primary and
| Agency | Environmental Protection Agency |
|---|---|
| Document type | Rule |
| Published | 2026-06-04 |
| Summary | The Environmental Protection Agency (EPA) is approving two separate requests from Maryland and Delaware to revise the designation for the Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE nonattainment area for the 2008 primary and secondary ozone national ambient air quality standards (NAAQS) and the 2015 primary and secondary ozone NAAQS. Due to the concurrent requests from Maryland and Delaware, the EPA is revising the Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE nonattainment area boundary into three distinct nonattainment areas that together cover the identical geographic area of the existing area. The EPA is also issuing clean data determinations (CDDs) for the revised Maryland |
| Document number | 2026-11169 |
| Official record | https://www.federalregister.gov/documents/2026/06/04/2026-11169/revisions-of-the-nonattainment-designation-for-the-2008-and-2015-ozone-standards-and-clean-data |