What is the purpose of UN Identification Numbers?

• A. Specific hazardous materials
• B. Packaging types
• C. Country of origin
• D. Transportation routes

Answer: (A)

UN Identification Numbers are four-digit codes assigned to dangerous goods to identify the exact material or closely related group. This identification lets anyone handling, shipping, or responding to an incident know precisely what substance is involved, what hazards it presents, and what actions are required. The number is used with the proper shipping name, hazard class, and packing group on shipping papers, labels, and placards, and it links to standardized hazard information in reference guides and emergency response materials. Because of this standardization, authorities and responders around the world can recognize the material quickly, even if they don’t speak the same language, and choose appropriate containment, suppression, and evacuation procedures. It does not indicate packaging type, country of origin, or transportation routes; those are separate pieces of information that may accompany the shipment but are not what the UN number communicates.