|County||Area||Nonattainment in year||Redesignation to attainment||Classification||Part or whole county||Population (2000)|
|District of Columbia||Washington DC-MD-VA||95||3/15/1996||Moderate <= 12.7 ppm||Whole||572,059|
KEY: 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: Moderate = an area with a design value of 9.1 up to 16.4 ppm.
SOURCE: U.S. Environmental Protection Agency, Green Book, available at http://www.epa.gov/oar/oaqps/greenbk/anay.html as of Apr. 20, 2002.