Which category of Noxious Liquid Substances includes the most harmful chemicals?

• A. Category A
• B. Category Y
• C. Category X
• D. Category Z

Answer: (C)

Noxious Liquid Substances are grouped by how much risk they pose to the marine environment. The highest risk category is the one used for the most dangerous chemicals, which is Category X. Substances in this category require the strictest controls for carriage, handling, and any potential discharge because of their significant potential to cause harm. The other categories denote lower levels of hazard, so they come with less stringent restrictions. So, the category that includes the most harmful chemicals is Category X.