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PM-2.5 (1997) Maintenance Areas (Redesignated from Nonattainment)Data is current as of March 31, 2023
The 1997 Primary Annual PM-2.5 NAAQS (level of 15 µg/m3) is revoked in attainment and maintenance areas for that NAAQS. For additional information see the PM-2.5 NAAQS SIP Requirements Final Rule, effective October 24, 2016. (81 FR 58009)
The PM-2.5 (1997) Philadelphia-Wilmington, PA-NJ-DE nonattainment area is included in both the Moderate and Subpart 1 list. NJ was classified as Subpart 1 at redesignation (effective September 4, 2013, 78 FR 54396), while PA and DE were classified as Moderate at redesignation. DE was redesignated effective September 4, 2014 79 FR 45350, and PA was redesignated effective April 21, 2015 80 FR 22112 .