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PM-2.5 (2006) Nonattainment Area Summary with History

Data is current as of December 31, 2025

Original PM-2.5 (2006) areas were designated effective December 14, 2009.

  NUMBER OF AREAS NUMBER OF COUNTIES 2010 POPULATION
Classif. Original 2009 Baseline Adjusted
Baseline*		 Today Redesig Original 2009 Baseline Adjusted
Baseline*		 Today Redesig Original 2009 Baseline Adjusted
Baseline*		 Today Redesig
Serious 0 5 3 2 0 19 13 6 0 21,828,537 19,645,863 2,182,674
Moderate 0 19 5 14 0 55 16 39 0 21,551,906 9,430,471 12,121,435
SUBTOTAL 0 24 8 16 0 74 29 45 0 43,380,443 29,076,334 14,304,109
   
Former Subpart 1 31 8 0 8 120 47 0 47 74,263,707 30,935,578 0 30,935,578
SUBTOTAL 31 8 0 8 120 47 0 47 74,263,707 30,935,578 0 30,935,578
   
GRAND
TOTAL		 31 32 8 24 120 121 29 92 74,263,707 74,316,021 29,076,334 45,239,687

* Please Note:

Changes can occur that adjust the original baseline counts, e.g., classification changes, area boundary changes, new areas designated nonattainment.
See the report listing these adjustments to original 2009 nonattainment areas.

The PM-2.5 (2006) 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 .

County subtotals and grand totals may not equal sum of parts. Part counties are only counted one time across groups.


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