Gases
Particulate air pollutants
Smoke
Prime movers
Compression-ignition engines
Emission
Exhaust gases
Reciprocating engines
Internal combustion engines
Pollutant gases
Combustion products
Link: BS ISO 8178-9:2019 Reciprocating internal combustion engines. Exhaust emission measurement Test cycles and test procedures for measurement of exhaust gas smoke emissions from compression ignition engines using an opacimeter
Source: BSI Standards