At such time that a particular source or modification becomes a major stationary source or major modification solely by virtue of a relaxation in any enforceable limitation which was established after August 7, 1980, on the capacity of the source or modification otherwise to emit a pollutant, such as a restriction on hours of operation, then the requirements of this Part shall apply to the source or modification as though construction had not yet commenced on the source or modification.

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