Annex VI MARPOL

Annex VI of MARPOL is the IMO treaty annex governing air pollution from ships, adopted in 1997 and in force since 19 May 2005. It caps SOx and NOx, bans deliberate ozone-depleting-substance emissions, and since 2011 carries the ship energy-efficiency regime in Chapter 4. Reg 14 sets the 0.50% m/m global sulfur limit (1 January 2020) and 0.10% in Emission Control Areas. Reg 13 sets NOx Tier I to III limits by keel-laying date. Chapter 4 holds EEDI, EEXI, the SEEMP, and the Carbon Intensity Indicator. Flag states enforce it through the IAPP certificate.