On September 1, 2017, new emissions regulations for passenger vehicles will come into force in the EU and Switzerland. These will plug the gaps in the existing legislation and ensure that diesel vehicles in particular become considerably cleaner as regards their nitric oxide emissions. However, they will also permit existing vehicles to continue to be sold for some time. Empa recommends buying diesel vehicles only if they have been approved in accordance with Euro 6d-TEMP or Euro 6d.