Division 2.3.3

United Kingdom

For engines fuelled with natural gas/biomethane, the ratio of the emission results ‘r’ shall be determined for each pollutant as follows:

r = \frac{emission result on reference fuel 2}{emission result on reference fuel 1}

or,

r_{a} = \frac{emission result on reference fuel 2}{emission result on reference fuel 3}

and

r_{b} = \frac{emission result on reference fuel 1}{emission result on reference fuel 3}