A 4-digit UN/NA number provides what information when using the ERG?

A 4-digit UN/NA number provides what information when using the ERG?

• A. The chemical's molecular formula.
• B. The hazard and protective actions linked by the UN/NA number.
• C. The shipping name and packing group.
• D. The storage temperature range.

Answer: (B)

The four-digit UN/NA number acts as a key to the Emergency Response Guidebook, pulling up the exact guide page for that material. On that page you’ll find the hazards associated with the substance and the recommended protective actions for responders—what to do, what to avoid, and what protective measures to wear or implement. That link between the number and the hazard-based actions is what the ERG is designed to provide so responders can act quickly and safely.

Molecular formulas aren’t the focus of the ERG’s quick-reference guidance, and shipping name or packing group are details from shipping documents rather than the ERG’s hazard-action guidance. Storage temperature ranges aren’t what the UN/NA number conveys in the ERG context.