What is the UN Identification Number?

What is the UN Identification Number?

• A. A 2-digit number
• B. A 4-digit number
• C. A 6-digit number
• D. A 3-digit number

Answer: (B)

The UN Identification Number is a four‑digit code used to identify dangerous goods during transport. This standardized number appears on shipping papers, labels, and emergency guidance so anyone handling or responding to an incident can instantly recognize the substance and its hazards. The four‑digit format lets regulators and carriers distinguish thousands of different substances consistently across all transport modes. For example, gasoline is identified as UN 1203, illustrating how a specific substance gets its unique code. Shorter or longer formats aren’t used in these international regulations, which is why a four‑digit code is the correct description.

The UN Identification Number is a four‑digit code used to identify dangerous goods during transport. This standardized number appears on shipping papers, labels, and emergency guidance so anyone handling or responding to an incident can instantly recognize the substance and its hazards. The four‑digit format lets regulators and carriers distinguish thousands of different substances consistently across all transport modes. For example, gasoline is identified as UN 1203, illustrating how a specific substance gets its unique code. Shorter or longer formats aren’t used in these international regulations, which is why a four‑digit code is the correct description.