🔍 Key Concepts

• 33 CFR Part 151 – Pollution Control regulations • The definition section for “oil” in the CFR (look at how broad or narrow it is) • How MARPOL divides substances into oil (Annex I) and noxious liquid substances (Annex II)

💭 Think About

• Ask yourself: in U.S. regulations, is “oil” limited to petroleum only, or does it also cover other types like animal and vegetable oils? • Consider whether noxious liquid substances under Annex II are treated as “oil,” or as a completely separate category from oil pollution. • Think about why regulators might want a broad or narrow definition of oil when writing pollution prevention rules.

✅ Before You Answer

• Look up the exact CFR definition of “oil” in 33 CFR and see all the items it lists. • Confirm whether animal and vegetable oils are explicitly included or excluded in that definition. • Verify if Annex II noxious liquid substances are grouped with oil, or regulated separately from oil under MARPOL and 33 CFR.