|County||Area||Nonattainment in year||Redesignation to attainment||Classification||Part or whole county||Population (2000)|
|Ada||Boise-Northern Ada County||95 96 97 98 99 00 01||NA||Not classified||Part||197,423|
KEY: NA = not applicable.
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 parts per million (ppm) and above; 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.