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PM-2.5 (2006) Nonattainment Area Summary with History

Data is current as of September 30, 2021

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 5 0 0 19 19 0 0 21,828,537 21,828,537 0
Moderate 0 19 8 11 0 55 19 36 0 21,551,906 9,486,143 12,065,763
SUBTOTAL 0 24 13 11 0 74 38 36 0 43,380,443 31,314,680 12,065,763
   
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 13 19 120 121 38 83 74,263,707 74,316,021 31,314,680 43,001,341

* 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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