1. (a) To identify an area by its air quality, all geographic areas in the state are designated by the federal administrator as "attainment," "nonattainment," or "unclassifiable." An area is designated "attainment" for a particular air pollutant if its air quality meets the ambient air quality standard for that air pollutant. If air quality does not meet the ambient standard for a particular air pollutant, that area is designated "nonattainment" for that air pollutant. If there is insufficient information to classify an area as attainment or nonattainment for a particular air pollutant, the area is designated "unclassifiable" for that air pollutant.

2. (b) The following areas have been designated by the federal administrator in 40 C.F.R. 81 as "nonattainment" for the specified air pollutants:

   1. (1) for carbon monoxide:

      1. (A) repealed 2/20/2004;
      2. (B) repealed 6/24/2004;
   2. (2) repealed 4/17/2015;
   3. (3) for PM-2.5: Fairbanks and North Pole urban area.

3. (c) To establish standards for the prevention of significant deterioration of air quality, geographic areas in the state are

   1. (1) divided into four "air quality control regions" as follows:

      1. (A) Cook Inlet Intrastate Air Quality Control Region;
      2. (B) Northern Alaska Intrastate Air Quality Control Region;
      3. (C) South Central Alaska Intrastate Air Quality Control Region; and
      4. (D) Southeast Alaska Intrastate Air Quality Control Region; and
   2. (2) classified as shown in Table 1 in this subsection for each air pollutant for which the area is designated "unclassifiable" or "attainment."

   Table 1.

   Air Quality Classifications

   ClassificationGeographic Area

   Class I areas

   Denali National Park including the Denali

   Wilderness but excluding the Denali National

   Preserve

   Bering Sea National Wildlife Refuge designated as a National Wilderness Area

   Simeonof National Wildlife Refuge designated as a National Wilderness Area

   Tuxedni National Wildlife Refuge designated as a National Wilderness Area

   Class II areas

   All other geographic areas in Alaska not

   classified as Class I or Class III

   Class III areas

   No areas in Alaska

4. (d) The following areas are subject to maintenance plan requirements for carbon monoxide, as required under 42 U.S.C. 7505a, and as adopted by reference in 18 AAC 50.030 as part of the state air quality control plan:

   1. (1) the Municipality of Anchorage;
   2. (2) Fairbanks and North Pole urban area.

5. (e) The following areas are subject to maintenance plan requirements for PM-10, as required under 42 U.S.C. 7505a, and as adopted by reference in 18 AAC 50.030 as part of the state air quality control plan:

   1. (1) Eagle River area of Anchorage;
   2. (2) Mendenhall Valley area of Juneau.

(Eff. 1/18/97, Register 141; am 2/20/2004, Register 169; am 6/24/2004, Register 170; am 10/1/2004, Register 171; am 12/9/2010, Register 196; am 10/6/2013, Register 208; am 4/17/2015, Register 214; am 11/7/2020, Register 236)