Category Z
NLS which, if discharged into the sea from tank cleaning or ballasting operations, are deemed to present a minor hazard to either marine resources or human health, and therefore justify less stringent restrictions on the quality and quantity of the discharge into the marine environment; and
Other substances (OS)
Substances found to fall outside of category X, Y or Z, as defined in the MARPOL Annex II regulations, and considered to present no harm to marine resources, human health, amenities or other legitimate uses of the sea when discharged into the sea from tank cleaning and ballasting operations.
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