This part of ISO 7967 establishes a vocabulary for emission control systems of reciprocating internal combustion engines. ISO 2710-1 gives a classification of reciprocating internal combustion engines and denotes basic terms and definitions of such engines and their characteristics. In this part of ISO 7967, terms are classified as the following: a) exhaust emission matter; b) exhaust emission control system and device; c) parameters for exhaust emission control system.