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

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