Measurements, abbreviations, and acronyms.

Measurements, abbreviations, and acronyms used in this subpart are defined as follows: BART—best available retrofit technology Btu—British thermal unit CO 2 —carbon dioxide CSAPR—Cross-State Air Pollution Rule H 2 O—water hr—hour lb—pound mmBtu—million Btu MWe—megawatt electrical NO X —nitrogen oxides O 2 —oxygen ppm—parts per million scfh—standard cubic feet per hour SIP—State implementation plan SO 2 —sulfur dioxide