Emissions of CH4 and N2O will depend on engine type and technology. Unless technology-specific emission factors have been developed, it is good practice to use the same fuel-specific set of emission factors for all years.
Mitigation options that affect emission factors can only be captured by using engine-specific emission factors, or by developing control technology assumptions. These changes should be adequately documented.
For more information on determining base year emissions and ensuring consistency in the time series, see Chapter 5 of Volume 1: Time Series Consistency.
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