a) A major stationary source or major modification shall not violate any condition contained in a construction permit issued for a new major stationary source or major modification which is subject to this Part.

b) In any nonattainment area, no person shall begin actual construction of a new major stationary source or major modification that is major for the regulated NSR pollutant for which the area is designated as nonattainment area under section 107(d)(1)(A)(i) of the CAA (42 U.S.C. 7407(d)(1)(A)(i)), except as in compliance with this Subpart and Subpart N. Revisions to this Part which were adopted to implement the CAA Amendments of 1990 shall not apply to any new major stationary source or major modification for which a permit application was submitted by June 30, 1992, for PM₁₀; by May 15, 1992, for SO₂; or by November 15, 1992, for VOM and NO_X emissions for sources located in all ozone nonattainment areas.

c) A person shall not cause or allow the operation of a new major stationary source or major modification subject to the requirements of Subpart N, except as in compliance with applicable LAER provisions established under Section 203.1800 for such source or modification.

(Source: Added at 49 Ill. Reg. 6237, effective April 23, 2025)