NOTES: Nonattainment areas do not meet the
national primary or secondary ambient air quality standard (NAAQS) for the
specified pollutant. Nonattainment
areas are classified based on design values:
Extreme = design value of 0.280 ppm (parts per million) and above;
Severe-17 = design value of 0.190 up to 0.280 ppm and has 17 years to reach
attainment; Severe-15 = design value of 0.180 up to 0.190 ppm and has 15
years to reach attainment; Serious = design value of 0.160 up to 0.180 ppm;
Moderate = design value of 0.138 up to 0.160 ppm; Marginal = design value of
0.121 up to 0.138 ppm; Section 185A = an area designated as an ozone
nonattainment area as of the date of enactment of the Clean Air Act
Amendments of 1990 and has not violated the national primary ambient air
quality standard for ozone for the 36-month period commencing on Jan. 1,
1987, and ending on Dec. 31, 1989.