Annex VI, which came into force on 19 May 2005, governs the control of the discharge of noxious substances from ship diesels. It is applicable to ship diesels with a power larger than 130kW built and installed since 1 st January 2000. The regulations limit discharges into the atmosphere of volatile organic compounds from tanker cargoes, sulphur oxide (SOx ) from the combustion of fuel oils and nitrogen oxide (NOx) from diesel engines. With regard to ozone depleting substances, deliberate discharge is prohibited. New installations, which contain ozone-depleting substances, are prohibited on all ships.