(a) The North Dakota plan, as submitted, is approved as meeting the requirements of Part C, Title I, of the Clean Air Act, except that it does not apply to sources proposing to construct on Indian Reservations.
(b) Regulation for preventing of significant deterioration of air quality. The provisions of Sec. 52.21 except paragraph (a)(1) are hereby incorporated and made a part of the North Dakota State implementation plan and are applicable to proposed major stationary sources or major modifications to be located on Indian Reservations.
(c) Definitions. For the purpose of this section:
(1) ``Major source baseline date'' means:
(i) In the case of PM10 and sulfur dioxide, January 6, 1975;
(ii) In the case of nitrogen dioxide, February 8, 1988; and
(iii) In the case of PM2.5, October 20, 2010.
(2) ``Minor source baseline date'' means the earliest date after the trigger date on which a major stationary source or a major modification subject to 40 CFR 52.21 or to regulations approved pursuant to 40 CFR 51.166 submits a complete application under the relevant regulations. The trigger date is:
(i) In the case of PM10 and sulfur dioxide, August 7, 1977;
(ii) In the case of nitrogen dioxide, February 8, 1988; and
(iii) In the case of PM2.5, October 20, 2011.
(3) The baseline date is established for each pollutant for which increments or other equivalent measures have been established if:
(i) The area in which the proposed source or modification would construct is designated as attainment or unclassifiable under section 107(d)(1)(A)(ii) or (iii) of the Act for the pollutant on the date of its complete application under 40 CFR 52.21 or under regulations approved pursuant to 40 CFR 51.166; and
(ii) In the case of a major stationary source, the pollutant would be emitted in significant amounts, or, in the case of a major modification, there would be a significant net emissions increase of the pollutant.
(4) ``Baseline area'' means any intrastate area (and every part thereof) designated as attainment or unclassifiable under section 107(d)(1)(A)(ii) or (iii) of the Act in which the major source or major modification establishing the minor source baseline date would construct or would have an air quality impact for the pollutant for which the baseline date is established, as follows: equal to or greater than 1 [micro]g/m\3\ (annual average) for SO2, NO2, or PM10; or equal or greater than 0.3 [micro]g/m\3\ (annual average) for PM2.5.
(5) Area redesignations under section 107(d)(1)(A)(ii) or (iii) of the Act cannot intersect or be smaller than the area of impact of any major stationary source or major modification which:
(i) Establishes a minor source baseline date; or
(ii) Is subject to 40 CFR 52.21 and would be constructed in the same state as the state proposing the redesignation.
(d) Ambient air increments. (1) In areas designated as Class I, II or III, increases in pollutant concentration over the baseline concentration shall be limited to the following: ------------------------------------------------------------------------
Maximum
allowable
Pollutant increase
(micrograms per
cubic meter)------------------------------------------------------------------------
Class I Area------------------------------------------------------------------------PM2.5:
Annual arithmetic mean............................... 1
24-hr maximum........................................ 2PM10:
Annual arithmetic mean............................... 4
24-hr maximum........................................ 8Sulfur dioxide:
Annual arithmetic mean............................... 2
24-hr maximum........................................ 5
3-hr maximum......................................... 25Nitrogen dioxide:
Annual arithmetic mean............................... 2.5------------------------------------------------------------------------
Class II Area------------------------------------------------------------------------PM2.5:
Annual arithmetic mean............................... 4
24-hr maximum........................................ 9PM10:
Annual arithmetic mean............................... 17
24-hr maximum........................................ 30Sulfur dioxide:
Annual arithmetic mean............................... 20
24-hr maximum........................................ 91
3-hr maximum......................................... 512Nitrogen dioxide:
Annual arithmetic mean............................... 25------------------------------------------------------------------------
Class III Area------------------------------------------------------------------------PM2.5:
Annual arithmetic mean............................... 8
24-hr maximum........................................ 18PM10:
Annual arithmetic mean............................... 34
24-hr maximum........................................ 60Sulfur dioxide:
Annual arithmetic mean............................... 40
24-hr maximum........................................ 182
3-hr maximum......................................... 700Nitrogen dioxide:
Annual arithmetic mean............................... 50------------------------------------------------------------------------
(2) For any period other than an annual period, the applicable maximum allowable increase may be exceeded during one such period per year at any one location. [44 FR 63103, Nov. 2, 1979. Correctly designated at 44 FR 75635, Dec. 21, 1979, as amended at 68 FR 11324, Mar. 10, 2003; 68 FR 74490, Dec. 24, 2003; 78 FR 45868, July 30, 2013]