The International Maritime Organisation (IMO) today decided to postpone the entry into force of nitrogen oxide (NOx) emissions limits for ship engines from 2016 to 2021. Environmental NGOs Transport & Environment (T&E) and Seas at Risk, founding members of the IMO observer organisation Clean Shipping Coalition, condemn IMO’s decision and now call on the EU to adopt its own NOx limits for cleaner air. The decision taken at a meeting in London of the IMO working group reviewing MARPOL Annex VI [1], adopted in 2008, delays the introduction of stricter NOx emissions limits for engines of ships built from 2016 when sailing in so-called ‘NOx Emissions Control Areas’. Currently the North American coastline is such an area, and the Baltic Sea might be designated to be one.