# Marking and Labeling of Dangerous Goods

*Last updated: 2026-06-25*

> Marking and labeling of dangerous goods refers to the mandatory affixing of prescribed hazard labels, UN numbers, orientation arrows for liquid contents, and—where required—placards to packages, overpacks, containers, and vehicles carrying hazardous materials.

Marking and labeling of dangerous goods refers to the mandatory affixing of prescribed hazard labels, UN numbers, orientation arrows for liquid contents, and—where required—placards to packages, overpacks, containers, and vehicles carrying hazardous materials. The applicable ruleset depends on the mode of transport: ADR governs road, the IMDG Code governs sea, and the IATA-DGR governs air transport, each specifying exact dimensions, colors, and placement requirements. Far from being a paperwork formality, correct marking allows drivers, dock workers, and emergency responders to identify hazardous substances at a glance and react appropriately. Missing or incorrect labels can lead to shipment rejection, regulatory fines, and liability exposure in the event of an incident. Marking and labeling should not be confused with dangerous goods documentation—such as the dangerous goods declaration or shipper's declaration—which is required in addition to the physical markings.

**Source:** [https://www.iata.org/en/programs/cargo/dgr/marking-labeling/](https://www.iata.org/en/programs/cargo/dgr/marking-labeling/)

## Quick Facts

| Property | Value |
|---|---|
| Term | Marking and Labeling of Dangerous Goods |
| Language | EN |
| Word count | 136 |
| Last updated | 2026-06-25 |
| Source | https://www.iata.org/en/programs/cargo/dgr/marking-labeling/ |

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