SUBTITLE B: AIR POLLUTION
CHAPTER I: POLLUTION CONTROL BOARD
SUBCHAPTER a: PERMITS AND GENERAL PROVISIONS
PART 204 PREVENTION OF SIGNIFICANT DETERIORATION
SECTION 204.250 BASELINE AREA
Section 204.250 Baseline Area
a) "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 CAA (42 USC 7407(d)(1)(A)(ii) or (iii)) 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 μg/m3 (annual average) for SO2, NO2, or PM10; or equal to or greater than 0.3 μg/m3 (annual average) for PM2.5.
b) Area redesignations under section 107(d)(1)(A)(ii) or (iii) of the CAA cannot intersect or be smaller than the area of impact of any major stationary source or major modification that:
1) Establishes a minor source baseline date; or
2) Is subject to this Part and would be constructed in the state proposing the redesignation.
c) Any baseline area established originally for the TSP increments shall remain in effect and shall apply for purposes of determining the amount of available PM10 increments, except that such baseline area shall not remain in effect if the Agency rescinds the corresponding minor source baseline date in accordance with Section 204.520(c).