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

As of September 22, 2016
Classification Number of Areas Number of Counties 2010 Population
Moderate 12 73 23,798,978
 
SUBTOTAL 12 73 23,798,978
 
Former Subpart 1 20 103 46,455,248
 
SUBTOTAL 20 103 46,455,248
 
GRAND TOTAL 32 176 70,254,226

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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