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. 2014 Mar 7;9:6. doi: 10.1186/1745-6673-9-6

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Copyright © 2014 Fiebig et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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KBA emission limits values. Limit values for passenger cars (upper left). Detailed view of EURO 3 to 6 norm for passenger cars (upper right). Limit values for commercial vehicles (lower right). Market penetration of new emission limit levels for passenger cars [2].