The following acronyms and abbreviations apply to part 89. AECD Auxiliary emission control deviceASME American Society of Mechanical EngineersASTM American Society for Testing and MaterialsCAA Clean Air ActCAAA Clean Air Act Amendments of 1990CI Compression-ignitionCO Carbon monoxideCO2 Carbon dioxideEGR Exhaust gas recirculationEPA Environmental Protection AgencyFEL Family emission limitFTP Federal Test Procedureg/kW-hr Grams per kilowatt hourHC HydrocarbonsICI Independent Commercial ImporterkW KilowattNIST National Institute for Standards and TestingNMHC Nonmethane hydrocarbonNTIS National Technical Information ServiceNO Nitric oxideNO2 Nitrogen dioxideNOX Oxides of nitrogenO2 OxygenOEM Original equipment manufacturerPM Particulate matterSAE Society of Automotive EngineersSEA Selective Enforcement AuditingSI Spark-ignitionTHC Total hydrocarbonU.S.C. United States CodeVOC Volatile organic compounds [59 FR 31335, June 17, 1994, as amended at 63 FR 56997, Oct. 23, 1998] Sec. 89.4 [Reserved]