The agency that regulates the transportation of compressed and liquefied gases is the:

• A. U.S. Department of Transportation (DOT)
• B. Environmental Protection Agency (EPA)
• C. Occupational Safety and Health Administration (OSHA)
• D. National Transportation Safety Board (NTSB)

Answer: (A)

Regulating the transportation of compressed and liquefied gases is handled by the U.S. Department of Transportation. This agency, through PHMSA, administers the Hazardous Materials Regulations, which govern how gases are packaged, labeled, documented, loaded, and transported across all modes (highway, rail, air, and sea). The rules cover packaging standards, labeling and placarding, shipping papers, training requirements, and carrier responsibilities to ensure safe hazmat transit. Other agencies focus on different areas: EPA handles environmental protection, OSHA oversees workplace safety, and NTSB investigates accidents to recommend improvements. The DOT is the one that sets and enforces the rules for moving hazardous materials in commerce.