ISO 7967-12:2014 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.