Dangerous goods
Dangerous Goods Class 2.3 — Toxic Gas
Last updated: 6 Jul 2026Reviewed by Ms. Rubab Nizami, Lead AVSEC Faculty
In short
Dangerous-goods Class 2.3 is toxic gas. Gases that are poisonous or corrosive by inhalation, such as chlorine. Its hazard label is a white diamond showing a skull and crossbones.
- Class
- 2.3
- Label colour
- White
- Symbol
- Skull and crossbones
- Passenger baggage
- Forbidden in passenger baggage.
What are examples of Class 2.3?
Examples include UN 1017 Chlorine, UN 1005 Ammonia, anhydrous. Gases that are poisonous or corrosive by inhalation, such as chlorine.
How is Class 2.3 handled and labelled?
Handled by trained personnel only; the label is a white diamond with a skull and crossbones. For passengers: forbidden in passenger baggage.