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8-Hr Ozone (1997) Nonattainment Area Summary with History (NAAQS Revoked)

As of April 06, 2015

Original 8-Hr Ozone (1997) areas were designated effective July 15, 2004, and the 8-Hr Ozone (1997) NAAQS was revoked effective April 6, 2015 (80 FR 12264).

  NUMBER OF AREAS NUMBER OF COUNTIES 2010 POPULATION
Classification Original
2004
Baseline
Baseline
with
Adjustments*
Today Redesignated Original
2004
Baseline
Baseline
with
Adjustments*
Today Redesignated Original
2004
Baseline
Baseline
with
Adjustments*
Today Redesignated
Extreme 0 2 2 0 0 12 12 0 0 19,560,500 19,560,500 0
Severe 17 1 2 1 1 4 2 1 1 15,718,827 3,757 913 2,844
Severe 15 0 4 4 0 0 17 17 0 0 9,429,685 9,429,685 0
Serious 3 3 3 0 15 16 16 0 6,511,922 9,707,337 9,707,337 0
Moderate 30 30 18 12 185 182 103 79 87,026,630 77,399,716 47,517,220 29,882,496
Marginal 7 18 7 11 55 77 34 43 15,252,289 27,258,053 12,606,192 14,651,861
SUBTOTAL 41 59 35 24 255 300 177 123 124,509,668 143,359,048 98,821,847 44,537,201
   
Former Subpart 1 71 56 0 56 172 136 0 136 37,634,461 22,506,809 0 22,506,809
SUBTOTAL 71 56 0 56 172 136 0 136 37,634,461 22,506,809 0 22,506,809
   
Marginal EAC 1 0 0 0 8 0 0 0 1,412,199 0 0 0
Subpart 1 EAC 13 0 0 0 41 0 0 0 9,486,189 0 0 0
SUBTOTAL 14 0 0 0 49 0 0 0 10,898,388 0 0 0
   
GRAND 
TOTAL
126 115 35 80 0 436 177 259    0   165,865,857    98,821,847    67,044,010

* 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 the original 2004 nonattainment area baseline.

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

The Greensboro EAC area was reclassified from Moderate EAC to Marginal EAC on November 2004. This table reflects the original area status after the reclassfication to Marginal EAC. Based on air quality data from 2005, 2006 and the first three quarters of 2007, the Denver CO Subpart 1 EAC area was designated nonattainment for 8-hour Ozone, effective November 20, 2007. The remaining thirteen (13) 8-Hr EAC areas were designated attainment on April 15, 2008.

On June 8, 2007, the United States Court of Appeals vacated the Subpart 1 portion of the Phase 1 Rule (Court Order) (PDF). On May 14, 2012, the Former Subpart 1 nonattainment areas were classified under Subpart 2 (77 FR 28424 ) (PDF), effective June 13, 2012.



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