Green Book

You are here: EPA Home > Green Book > PM-2.5 (1997) Maintenance Area (Redesignated from Nonattainment) Summary

PM-2.5 (1997) Maintenance Area (Redesignated from Nonattainment) Summary

Data is current as of June 20, 2017

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)



Classification Number of Areas Number of Counties 2010 Population
Moderate 13 78 24,817,882
SUBTOTAL 13 78 24,817,882
 
Former Subpart 1 19 95 44,492,305
SUBTOTAL 19 95 44,492,305
 
GRAND TOTAL 32 173 69,310,187

County subtotals and grand totals may not equal sum of parts. Part counties are only counted one time within groupings. Multi-state nonattainment areas are not considered maintenance areas until all states in the area have been redesignated

The PM-2.5 (1997) Philadelphia-Wilmington, PA-NJ-DE nonattainment area, county and population are included in the Moderate classification grouping. 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 .