Discussions in the MEPC and drafting work by a working group, led to the adoption in 1991, of an IMO Assembly Resolution A.719(17) on Prevention of Air Pollution from Ships. The Resolution called on the MEPC to prepare a new draft Annex to MARPOL on prevention of air pollution.
The new draft Annex was developed over the next six years - and was finally adopted at a Conference in September 1997. It was agreed to adopt the new Annex through adding a Protocol to the MARPOL Convention, which included the new Annex. This enabled specific entry into force conditions to be set out in the protocol.