1. a) The following abbreviations are used in this Part:

   ASTM	American Society for Testing and Materials
   Btu	British thermal unit
   bhp	brake horsepower
   CEMS	continuous emissions monitoring system
   EGU	Electrical Generating Unit
   dscf	dry standard cubic feet
   g/bhp-hr	grams per brake horsepower-hour
   kg	kilogram
   kg/MW-hr	kilograms per megawatt-hour
   lb	pound
   lbs/mmBtu	pounds per million Btu
   Mg	megagram or metric ton
   mm	million
   mmBtu	million British thermal units
   mmBtu/hr	million British thermal units per hour
   MWe	megawatt of electricity
   MW	megawatt; one million watts
   MW-hr	megawatt-hour
   NATS	NOx Allowance Tracking System
   NO2	nitrogen dioxide
   NOx	nitrogen oxides
   O2	oxygen
   psia	pounds per square inch absolute
   peoc	potential electrical output capacity
   PTE	potential to emit
   ppm	parts per million
   ppmv	parts per million by volume
   PEMS	predictive emission monitoring system
   T	English ton
   TPY	tons per year

2. b) The following conversion factors have been used in this Part:

   English	Metric
   2.205 lb	1 kg
   1 T	0.907 Mg
   1 lb/T	0.500 kg/Mg

(Source: Amended at 49 Ill. Reg. 6355, effective April 23, 2025)