KEY: NA = not applicable; ppm = parts per million.
NOTES: Nonattainment areas do not meet the national primary or secondary
ambient air quality standard for the specified pollutant. Nonattainment areas
are classified based on design values: Serious = an area with a design value of
16.5 ppm and above; Moderate = an area with a design value of 9.1 up to 16.4 ppm.