Division 2.3 hazards are characterized as:

Division 2.3 hazards are characterized as:

• A. Gases poisonous by inhalation
• B. Gases that are flammable
• C. Gases that are non-toxic
• D. Cryogenic gases

Answer: (A)

Division 2.3 hazards are gases poisonous by inhalation. In this subdivision, the primary danger comes from breathing the gas, which can cause severe health effects, incapacitation, or death even at relatively low concentrations. This distinguishes them from other Class 2 gases: flammable gases (Division 2.1) pose fire and explosion risks, while non‑toxic gases (Division 2.2) mainly threaten by displacing oxygen rather than causing chemical poisoning. Cryogenic gases describe extremely cold materials and their hazards are related to low temperatures and asphyxiation risks, not inhalation toxicity. So the correct description emphasizes inhalation toxicity rather than flammability or cold-temperature effects.

Division 2.3 hazards are gases poisonous by inhalation. In this subdivision, the primary danger comes from breathing the gas, which can cause severe health effects, incapacitation, or death even at relatively low concentrations. This distinguishes them from other Class 2 gases: flammable gases (Division 2.1) pose fire and explosion risks, while non‑toxic gases (Division 2.2) mainly threaten by displacing oxygen rather than causing chemical poisoning. Cryogenic gases describe extremely cold materials and their hazards are related to low temperatures and asphyxiation risks, not inhalation toxicity. So the correct description emphasizes inhalation toxicity rather than flammability or cold-temperature effects.