Accelerating progress from Euro 4/IV to Euro 6/VI vehicle emissions standards

This brief presents the technical details and benefits of leapfrogging to Euro VI heavy-duty emission standards and Euro 6 light-duty emission standards rather than progressing through Euro 5/V. As many countries model their vehicle emission standards after those developed for the EU, the lessons learned in the European market should inform policymakers and manufacturers in other markets. This means acknowledging both the successes of these policies in leading to highly efficient control technology, and some of the failings in intermediate policy stages. Since the adoption of Euro 5/V standards across the EU, several shortcomings of the regulation have been revealed.