Measurements, abbreviations, and acronyms used in this subpart are defined as follows:

BART—best available retrofit technology

Btu—British thermal unit

CO2—carbon dioxide

CSAPR—Cross-State Air Pollution Rule

H2O—water

hr—hour

lb—pound

mmBtu—million Btu

MWe—megawatt electrical

NOX—nitrogen oxides

O2—oxygen

ppm—parts per million

scfh—standard cubic feet per hour

SIP—State implementation plan

SO2—sulfur dioxide