BS ISO 8178-3:2019 Reciprocating internal combustion engines. Exhaust emission measurement Test procedures for measurement of exhaust gas smoke emissions from compression ignition engines using a filter type smoke meter

Definitions
Pollutant gases
Reciprocating engines
Determination of content
Smoke
Opacity
Emission
Filtration
Exhaust gases
Optical measurement
Soot
Internal combustion engines
Testing conditions
Gases
Prime movers
Combustion products

Link: BS ISO 8178-3:2019 Reciprocating internal combustion engines. Exhaust emission measurement Test procedures for measurement of exhaust gas smoke emissions from compression ignition engines using a filter type smoke meter
Source: BSI Standards