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PM-2.5 (1997) Maintenance Area Summary

As of October 01, 2015

  Number of 
Classification Areas  Counties 2010
Population

Moderate  9  39  15,919,777
 
   SUBTOTAL:   9   39   15,919,777
 
Former Subpart 1  20  103  46,455,248
 
   SUBTOTAL:   20   103   46,455,248
 

   GRAND TOTAL:   29  142  62,375,025

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 1997 PM-2.5 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 .


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