In the Noxious Liquid Substances framework, vegetable oils are categorized as which category?

• A. X
• B. Y
• C. Z
• D. Other

Answer: (B)

Think of the Noxious Liquid Substances scheme as a way to rate how harmful a cargo could be to the sea if spilled. It groups substances into four categories: one for substances that are very dangerous in any spill, one for those that are harmful to the marine environment under real spill conditions, one for hazards that depend on specific circumstances, and a catch‑all for items not listed.

Vegetable oils are placed in the second group because they aren’t acutely toxic in all situations, but they can cause real environmental harm if released in bulk: an oil film on the surface can smother marine life and birds, and their degradation can deplete oxygen in the water. This aligns with the category describing substances hazardous to the marine environment under typical spill scenarios, rather than the top-tier “very dangerous in any spill” or the conditional category, and they aren’t simply unlisted. So they belong in the second category.