The operator shall calculate annual average hourly N₂O emissions for each source where continuous emission measurement is applied using the following equation:

N2O emissionsav hourlykg/h = ΣN2O conchourlymg/Nm3 * flue gas flowNm3/h * 10–6Hours of operationh

Where:

N₂O emissions_{av hourly}

annual average hourly N₂O emissions in kg/h from the source;

N₂O conc_hourly

hourly concentrations of N₂O in mg/Nm³ in the flue gas flow measured during operation;

Flue gas flow

flue gas flow determined in Nm³/h for each hourly concentration.

The operator shall determine hourly N₂O concentrations [mg/Nm³] in the flue gas from each emission source using a measurement-based methodology at a representative point, after the NO_x/N₂O abatement equipment, where abatement is used. The operator shall apply techniques capable of measuring N₂O concentrations of all emission sources during both abated and unabated conditions. Where uncertainties increase during such periods, the operator shall take them into account in the uncertainty assessment.

The operator shall adjust all measurements to a dry gas basis where required and report them consistently.