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PM-2.5 (1997) Nonattainment Area Summary with History

Data is current as of December 31, 2024

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)

Original PM-2.5 (1997) areas were designated effective April 5, 2005.

  NUMBER OF AREAS NUMBER OF COUNTIES 2010 POPULATION
Classif. Original 2005 Baseline Adjusted
Baseline*		 Today Redesig Original 2005 Baseline Adjusted
Baseline*		 Today Redesig Original 2005 Baseline Adjusted
Baseline*		 Today Redesig
Serious 0 1 1 0 0 8 8 0 0 3,842,165 3,842,165 0
Moderate 0 18 2 16 0 97 5 92 0 43,818,664 15,737,124 28,081,540
SUBTOTAL 0 19 3 16 0 105 13 92 0 47,660,829 19,579,289 28,081,540
   
Former Subpart 1 39 20 0 20 208 103 0 103 94,116,077 46,455,248 0 46,455,248
SUBTOTAL 39 20 0 20 208 103 0 103 94,116,077 46,455,248 0 46,455,248
   
GRAND
TOTAL		 39 39 3 36 208 208 13 195 94,116,077 94,116,077 19,579,289 74,536,788

* 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 2005 nonattainment areas.

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 .

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


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