(b) Is subject to 40 51.166 and would be constructed in the same state as the state proposing the redesignation. Regulation 61-62.5, Std. 7, paragraph (b)(31)(i) through (iii)(b), shall be revised as follows: (31)(i) source baseline means: “Major date” (a) In the case of PM10 and sulfur dioxide, January 6, 1975; (b) In the case of nitrogen dioxide, February 8, 1988; and (c) In the case of PM2.5, October 20, 2010. (ii) source baseline means the earliest date after the trigger date on which a major “Minor date” stationary source or a major modification subject to 40 52.21 or to regulations approved pursuant to 40 51.166 submits a complete application under the relevant regulations. The trigger date is: (a) In the case of PM10 and sulfur dioxide, August 7, 1977; (b) In the case of nitrogen dioxide, February 8, 1988; and (c) In the case of PM2.5, October 20, 2011. (iii) The baseline date is established for each pollutant for which increments or other equivalent measures have been established if: (a) 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 Federal Clean Air Act for the pollutant on the date of its complete application under 40 52.21 or under regulations approved pursuant to 40 51.166; and (b) 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. Regulation 61-62.5, Std. 7, paragraph (c), shall be revised as follows: (c) Ambient air increments. In areas designated as Class I, II or , increases in pollutant concentration over the baseline concentration shall be limited to the following: CLASS I Maximum Allowable Increase Pollutant (micrograms per cubic meter) annual arithmetic mean 1 PM2.5: 24-hr maximum 2 annual arithmetic mean 4 PM10: 24-hr maximum 8 Sulfur dioxide: annual arithmetic mean 2
(b) Is subject to 40 51.166 and would be constructed in the same state as the state proposing the redesignation. Regulation 61-62.5, Std. 7, paragraph (b)(31)(i) through (iii)(b), shall be revised as follows: (31)(i) “Major source baseline date” means: (a) In the case of PM10 and sulfur dioxide, January 6, 1975; (b) In the case of nitrogen dioxide, February 8, 1988; and (c) In the case of PM2.5, October 20, 2010. (ii) “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 52.21 or to regulations approved pursuant to 40 51.166 submits a complete application under the relevant regulations. The trigger date is: (a) In the case of PM10 and sulfur dioxide, August 7, 1977; (b) In the case of nitrogen dioxide, February 8, 1988; and (c) In the case of PM2.5, October 20, 2011. (iii) The baseline date is established for each pollutant for which increments or other equivalent measures have been established if: (a) 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 Federal Clean Air Act for the pollutant on the date of its complete application under 40 52.21 or under regulations approved pursuant to 40 51.166; and (b) 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. Regulation 61-62.5, Std. 7, paragraph (c), shall be revised as follows: (c) Ambient air increments. In areas designated as Class I, II or , increases in pollutant concentration over the baseline concentration shall be limited to the following: CLASS I Pollutant Maximum Allowable Increase (micrograms per cubic meter) PM2.5: annual arithmetic mean 1 24-hr maximum 2 PM10: annual arithmetic mean 4 24-hr maximum 8 Sulfur dioxide: annual arithmetic mean 2
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