Under federal hazardous materials regulations, which of the following is explicitly included in the term hazardous material?

• A. Nonhazardous Substances
• B. Hazardous Substances
• C. Radioactive Materials
• D. Household Chemicals

Answer: (B)

In these regulations, a material is treated as hazardous if it could pose a risk to health, safety, or property during transport. The definitions explicitly include hazardous substances as a subset of hazardous materials, so any material designated as a hazardous substance is automatically considered a hazardous material for shipping purposes. Nonhazardous substances aren’t included by definition, and household chemicals aren’t singled out as an explicit category, even though some may be hazardous in practice. Radioactive materials are regulated under their own class, but the explicit named category within the general term is hazardous substances.