How is MARPOL annex 3 different from IMDG code ? where will you find the marine pollutant in IMDG code ?

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The Annex also comprises general requirements to issue detailed regulations regarding packing, labelling, documentation, stowage, limits on size, etc to satisfy demands on safety and to reduce the risks of pollution by noxious substances. To facilitate for the accession the International Maritime Dangerous Goods Code (IMDG) has also been amended to include marine pollutants.

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Each substance defined as harmful to the marine environment is identified as marine pollutant in column 4 of its entry in the Dangerous Goods List