Report - DCE - Nationalt Center for Miljø og Energi

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The description of methodologies and references for the transport part of the
Danish inventory is given in two sections: one for road transport and one for
the other mobile sources.
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For road transport, the detailed methodology is used to make annual estimates
of the Danish emissions, as described in the EMEP/EEA Air Pollutant
Emission Inventory Guidebook (EMEP/EEA, 2009). The actual calculations
are made with a model developed by ENVS, using the European COPERT
IV model methodology explained by (EMEP/EEA, 2009). In COPERT, fuel
consumption and emission simulations can be made for operationally hot
engines, taking into account gradually stricter emission standards and emission
degradation due to catalyst wear. Furthermore, the emission effects of
cold-start and evaporation are simulated.
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Corresponding to the COPERT IV fleet classification, all present and future
vehicles in the Danish fleet are grouped into vehicle classes, sub-classes and
layers. The layer classification is a further division of vehicle sub-classes into
groups of vehicles with the same average fuel consumption and emission
behaviour, according to EU emission legislation levels. Table 3.27 gives an
overview of the different model classes and sub-classes, and the layer level
with implementation years are shown in Annex 2.B.1.