Division 3.4.4 NOx correction for humidity

All the NO_x concentrations, including dilution air background concentrations, shall be corrected for intake-air humidity using equation (7-102) or (7-103):

1. (a)

   For compression-ignition engines

   x NOxcor = x NOxuncor · (9,953 · x H2O + 0,832)

   (7-102)

2. (b)

   For spark-ignition engines

   x NOxcor = x NOxuncor · (18,840 · x H2O + 0,68094)

   (7-103)

   Where:

   x _NOxuncor

3. uncorrected NO_x molar concentration in the exhaust gas [μmol/mol]

x _H2O

4. amount of water in the intake air [mol/mol]