Tankerman · Chemical — MARPOL Annex II Categories
Noxious liquid substances under MARPOL Annex II are grouped into pollution categories X, Y, and Z, where Category X is:
- AHarmless and freely dischargeable
- BThe most hazardous, posing a major hazard and warranting the strictest discharge prohibition✓ Correct
- CThe same as petroleum crude
- DReserved for clean ballast
Explanation
Annex II ranks noxious liquid substances by environmental hazard: Category X (major hazard — discharge prohibited), Y (hazard — limited discharge), Z (minor hazard — less restricted), plus 'Other Substances' (OS). The category drives prewash, discharge, and ship-type requirements.
Authority: MARPOL Annex II
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