40 CFR § 97.103 - Measurements, abbreviations, and acronyms.

Measurements, abbreviations, and acronyms used in this subpart and subparts BB through II 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