Carbon Intensity Indicator (CII)

The Carbon Intensity Indicator (CII) is the operational efficiency metric for ships of 5,000 GT and above, introduced into MARPOL Annex VI Chapter 4 by MEPC.328(76) and in force from 1 January 2023. The attained CII is annual CO2 emissions divided by transport work (capacity times distance), expressed in grams CO2 per deadweight-mile or capacity-mile. Each ship receives a rating from A to E against a required CII that tightens each year along the MEPC.338(76) reduction-factor line. Ships rated D for three consecutive years or E for one year must submit a corrective action plan in the SEEMP Part III.