What markings and labels must a package carrying dangerous goods display?

• A. UN number and PSN on outer packaging, hazard class/division, and where required hazard labels and handling/orientation marks
• B. Only the UN number
• C. Only the hazard labels
• D. Only the shipper's logo

Answer: (A)

When a package contains dangerous goods, the outer packaging must carry a complete set of identifying and hazard information. The UN number and the Proper Shipping Name (PSN) identify exactly what substance or article is inside, giving a precise reference for handlers and responders. The hazard class or division tells you the general type of danger (for example, flammable, toxic, or corrosive) and helps determine the correct handling and emergency actions. Where required, hazard labels must be affixed to communicate the specific dangers at a glance, even without reading the text. Orientation or handling marks indicate any special positioning or handling needs to prevent leaks, spills, or other issues during transport. Taken together, these markings provide clear identification, hazard recognition, and safe handling instructions, which is why this full set is required. Displaying only one element leaves critical information out, whereas the complete combination ensures proper and compliant transport.