MARPOL Annex VI – IMO FAQs on Sulphur Limits in Emission Control Areas The IMO has published a set of FAQs regarding the sulphur limits in emission control areas as per the attached. The Association has dealt with MARPOL Annex VI in the Special Circular No.14-009 dated 4 November 2014.  Members are recommended to read the attached FAQs in conjunction with the Special Circular.