On 12 July, the Commission published a Regulation extending the type-approval requirements to motor vehicles fuelled by hydrogen (H2) and mixtures of hydrogen and natural gas (H2NG) with respect to emissions.  

The Regulation is available here:

http://eurlex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2012:182:0014:0026:EN:PDF