CO 2 emissions and economic incentives The CO₂ emissions from passenger cars is declining. Some changes are due to ever improved technology provided by car manufacturers and others induced by political regulation. The report investigates the recent changes in CO₂ intensity in the car fleets in the Nordic countries. The trends in the car sales are presented and the impacts on overall CO₂ intensity are outlined. All Nordic countries have in the past ten years changed the national regulation of passenger cars through different economic incentives and various schemes making low emissions vehicles more favourable. The report describes these changes and complement with an overview of international empirical findings concerning the main tax instruments (purchase-, annual-, fuel tax and road user charges). The potential impact of these taxes are reviewed and recommendations for future uses of the various instruments are provided. TemaNord 2017:530 ISBN 978-92-893-4985-7 (PRINT) ISBN 978-92-893-4986-4 (PDF) ISBN 978-92-893-4987-1 (EPUB)

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The emissions of CO2 and regulated pollutants (NOx, HC, CO, PM) of thirteen Euro 5 compliant passenger cars (seven gasoline, six Diesel) were measured on a chassis dynamometer. The vehicles were driven repeatedly over the European type-approval driving cycle (NEDC) and the more dynamic WMTC and CADC driving cycles. Distance-specific emission factors were derived for each pollutant and sub-cycle, and these were subsequently compared to the corresponding emission factors provided by the reference European models used for vehicle emission inventory compilation (COPERT and HBEFA) and put in context with the applicable European emission limits. The measured emissions stayed below the legal emission limits when the type-approval cycle (NEDC) was used. Over the more dynamic cycles (considered more representative of real-world driving) the emissions were consistently higher but in most cases remained below the type-approval limit. The high NOx emissions of Diesel vehicles under real-world driving conditions remain the main cause for environmental concern regarding the emission profile of Euro 5 passenger cars. Measured emissions of NOx exceeded the type-approval limits (up to 5 times in extreme cases) and presented significantly increased average values (0.35 g/km for urban driving and 0.56 g/km for motorway driving). The comparison with the reference models showed good correlation in all cases, a positive finding considering the importance of these tools in emission monitoring and policy-making processes.

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