Measurements, abbreviations, and acronyms used in this subpart and subparts BBBB through IIII are defined as follows:

Btu—British thermal unit. CO2—carbon dioxide. H2O—water. Hg—mercury.hr—hour.kW—kilowatt electrical.kWh—kilowatt hour.lb—pound.mmBtu—million Btu. MWe—megawatt electrical. MWh—megawatt hour. NOX—nitrogen oxides. O2—oxygen.ppm—parts per million.scfh—standard cubic feet per hour. SO2—sulfur dioxide.yr—year.