Symbols, acronyms, and abbreviations.

The following symbols, acronyms, and abbreviations apply to this part: ABT Averaging, banking, and trading. AECD auxiliary emission control device. CFR Code of Federal Regulations. CH 4 methane. CO carbon monoxide. CO 2 carbon dioxide. cyl cylinder. disp. displacement. ECA Emission Control Area. EEZ Exclusive Economic Zone. EPA Environmental Protection Agency. FEL Family Emission Limit. g grams. HC hydrocarbon. hr hours. IMO International Maritime Organization. kPa kilopascals. kW kilowatts. L liters. LTR Limited Testing Region. N 2 O nitrous oxide. NARA National Archives and Records Administration. NMHC nonmethane hydrocarbon. NO X oxides of nitrogen (NO and NO 2 ). NTE not-to-exceed. PM particulate matter. RPM revolutions per minute. SAE Society of Automotive Engineers. SCR selective catalytic reduction. THC total hydrocarbon. THCE total hydrocarbon equivalent. ULSD ultra low-sulfur diesel fuel. U.S.C. United States Code. [81 FR 74154, Oct. 25, 2016]