The Full Form of HNS is Hazardous and Noxious Substances.
Hazardous and noxious substances (HNS) are defined as any substance other than oil, which if introduced into the marine environment, are likely to create hazards to human health, harm living resources and other marine life, damage amenities, and/or interfere with other legitimate uses of the sea
HNS
means
Hazardous and Noxious Substances
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