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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.