35 Ill. Adm. Code 203.2230
PAL Major Modification
Section 203.2230Â PAL Major Modification
"PAL major modification" means, notwithstanding Section
203.1220 and Section 203.1260 (the definitions for major modification and net
emissions increase), any physical change in or change in the method of
operation of the PAL source that causes it to emit the PAL pollutant at a level
equal to or greater than the PAL.