AECD Auxiliary emission control device

ASME American Society of Mechanical Engineers

ASTM American Society for Testing and Materials

CAA Clean Air Act

CAAA Clean Air Act Amendments of 1990

CI Compression-ignition

CO Carbon monoxide

CO2 Carbon dioxide

EGR Exhaust gas recirculation

EPA Environmental Protection Agency

FEL Family emission limit

FTP Federal Test Procedure

g/kW-hr Grams per kilowatt hour

HC Hydrocarbons

ICI Independent Commercial Importer

kW Kilowatt

NIST National Institute for Standards and Testing

NMHC Nonmethane hydrocarbon

NTIS National Technical Information Service

NO Nitric oxide

NO2 Nitrogen dioxide

NOX Oxides of nitrogen

O2 Oxygen

OEM Original equipment manufacturer

PM Particulate matter

SAE Society of Automotive Engineers

SEA Selective Enforcement Auditing

SI Spark-ignition

THC Total hydrocarbon

U.S.C. United States Code

VOC Volatile organic compounds