(1) Any new major stationary source or major modification which would locate anywhere in an area designated as attainment or unclassified for a national ambient air quality standard under 40 CFR 81.327 and which would cause or contribute to a violation of a national ambient air quality standard for any pollutant at any locality that does not or would not meet the national ambient air quality standard for that pollutant, shall obtain from the department a Montana air quality permit prior to construction in accordance with subchapters 7 and 8 and all requirements contained in this subchapter if applicable. A major stationary source or major modification exempted from the requirements of subchapter 7 under ARM 17.8.744 or 17.8.745 which would locate anywhere in an area designated as attainment or unclassified for a national ambient air quality standard under 40 CFR 81.327 and which would cause or contribute to a violation of a national ambient air quality standard for any pollutant at any locality that does not or would not meet the national ambient air quality standard for that pollutant, shall, prior to construction, still be required to obtain a Montana air quality permit and comply with the requirements of ARM 17.8.748, 17.8.749, 17.8.756, 17.8.759 and 17.8.760 and other applicable requirements of this subchapter.

(2) In the absence of emission reductions compensating for the adverse impact of the source, the Montana air quality permit will be denied.