Toxic gases would fall under which UN/DOT hazard class and division?

Toxic gases would fall under which UN/DOT hazard class and division?

• A. 2.3
• B. 1.2
• C. 1.1
• D. 6.1

Answer: (A)

Toxic gases are categorized under hazard class 2, with the specific division 2.3 identifying toxic gases. In UN/DOT terminology, class 2 covers all gases, and the subdivisions distinguish the type of hazard: 2.1 for flammable gases, 2.2 for non-flammable, non-toxic gases, and 2.3 for toxic gases. The division 2.3 label signals that the primary hazard is inhalation toxicity, not flammability or non-toxicity. That’s why toxic gases fall under 2.3. For contrast, explosive substances belong to class 1 (with divisions like 1.1 or 1.2 indicating different explosive hazards), and toxic substances that aren’t gases (solids or liquids) fall under class 6.1.

Toxic gases are categorized under hazard class 2, with the specific division 2.3 identifying toxic gases. In UN/DOT terminology, class 2 covers all gases, and the subdivisions distinguish the type of hazard: 2.1 for flammable gases, 2.2 for non-flammable, non-toxic gases, and 2.3 for toxic gases. The division 2.3 label signals that the primary hazard is inhalation toxicity, not flammability or non-toxicity. That’s why toxic gases fall under 2.3.

For contrast, explosive substances belong to class 1 (with divisions like 1.1 or 1.2 indicating different explosive hazards), and toxic substances that aren’t gases (solids or liquids) fall under class 6.1.