Jump to main content or area navigation.

Contact Us

Green Book Nonattainment Areas

1-Hour Ozone (1979) Nonattainment Area Summary with History - NAAQS Revoked

As of June 15, 2005
  NUMBER OF AREAS NUMBER OF COUNTIES 2000 POPULATION (1000s)
Classif. Original 1991 BaselineAdjusted
Baseline*
Today Redesig Original 1991 BaselineAdjusted
Baseline*
Today Redesig Original 1991 BaselineAdjusted
Baseline*
Today Redesig
Extreme 1 2 2 0 4 12 12 0 13,000 0 17,783 17,783 0
Severe (2007) * 5 6 6 0 52 51 51 0 31,683 0 35,420 35,420 0
Severe (2005) 4 7 6 1 22 61 48 13 11,525 0 20,434 16,735 3,699
Serious 14 13 8 5 86 50 38 12 22,724 0 24,961 16,125 8,836
Moderate 31 29 5 24 113 95 12 83 40,176 0 29,742 1,737 28,005
Marginal 42 43 18 25 89 90 38 52 19,533 0 21,529 6,884 14,645
Other 1 2 1 1 5 14 9 5 1,362 0 8,064 6,542 1,522
SUBTOTAL 98 102 46 56 371 364 199 165 140,003 157,933 101,226 56,707
Section 185A 12 11 3 8 23 21 4 17 5,151 0 5,466 459 5,007
Incomplete Data 47 23 14 9 50 26 15 11 3,755 0 2,182 1,260 922
SUBTOTAL 59 34 17 17 73 47 19 28 8,906 7,648 1,719 5,929
   
GRAND TOTAL 157 136 63 73 444 410 217 193 148,909 165,581 102,945 62,636

* 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 1991 nonattainment area baseline.

78 FR 58189, effective 10/23/2013, corrected a boundary for the land of the Morongo Band of Mission Indians, located near Banning Pass in Riverside County, identifying it as a separately designated Severe-17 area for the 1-Hour Ozone standard, independent of the Los Angeles-South Coast Air Basin Area.

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

"Section 185A" was previously called "Transitional". The Ohio portion of the Youngstown-Warren-Sharon OH-PA area is a maintenance area, while the Pennsylvania portion remains nonattainment. The redesignated area column of this report does not include the partially redesignated areas.

Go Top

Jump to main content.