The following acronyms and abbreviations apply to this part 91. AECD--Auxiliary emission control deviceASME--American Society of Mechanical EngineersASTM--American Society for Testing and MaterialsCAA--Clean Air ActCAAA--Clean Air Act Amendments of 1990CLD--chemiluminescent detectorCO--Carbon monoxideCO2--Carbon dioxideEPA--Environmental Protection AgencyFEL--Family Emission Limitg/kw-hr--grams per kilowatt hourHC--hydrocarbonsHCLD--heated chemiluminescent detectorHFID--heated flame ionization detectorICI--Independent Commercial ImporterMY--Model YearNDIR--non-dispersive infrared analyzerNIST--National Institute for Standards and TestingNO--Nitric oxideNO2--Nitrogen dioxideNOX--Oxides of nitrogenOB--Outboard engineO2--OxygenOEM--Original engine manufacturerPMD--paramagnetic detectorPWC--personal watercraftRPM--revolutions per minuteSAE--Society of Automotive EngineersSEA--Selective Enforcement AuditingSI--Spark-ignitionU.S.C.--United States CodeVOC--Volatile organic compoundsZROD--zirconium dioxide sensor