The following article, provided by the Gard P&I Club, cites the key sulphur emission limits in several designated MARPOL emission control areas (ECAs) of the world.
Recent attention has been focused on the reduction of the global sulphur cap from 3.50% to 0.50% – but don’t forget there are lower sulphur level requirements in designated MARPOL emission control areas and areas defined by regional governmental entities. Here is a round-up of such areas.
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https://safety4sea.com/regional-sulphur-emission-limits-at-a-glance/