Further optimization of NOx emissions under the EU 6d regulation

The first stage of the regulations on real-driving emissions (RDE) became effective in Europe in September 2017. Since then compliance with the EU6d_temp stage has been required in order obtain a type approval. Due to the broad-based use of particulate filters the residual emissions from diesel cars represent only a very small share of inner-city particulate-matter air pollution. For this reason, further development activities on diesel powertrains are now geared towards effectively limiting nitrogen-oxide emissions.