Regulations last checked for updates: Nov 22, 2024

Title 40 - Protection of Environment last revised: Nov 20, 2024
§ 97.603 - Measurements, abbreviations, and acronyms.

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

Btu—British thermal unit CO2—carbon dioxide CSAPR—Cross-State Air Pollution Rule H2O—water hr—hour 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 SIP—State implementation plan SO2—sulfur dioxide TR—Transport Rule yr—year [76 FR 48432, Aug. 8, 2011, as amended at 81 FR 74616, Oct. 26, 2016]
source: 65 FR 2727, Jan. 18, 2000, unless otherwise noted. 71 FR 25396, 25422, and 25443, Apr. 28, 2006
cite as: 40 CFR 97.603