35 Ill. Adm. Code 203.2190
Major Emissions Unit
Section 203.2190Â Major Emissions Unit
"Major emissions unit" means:
a)Â Â Â Â Â Â Â Â Any
emissions unit that emits or has the potential to emit 100 tpy or more of the
PAL pollutant in an attainment area; or
b)Â Â Â Â Â Â Â Â Any
emissions unit that emits or has the potential to emit the PAL pollutant in an
amount that is equal to or greater than the major source threshold for the PAL
pollutant as defined by the CAA for nonattainment areas.