TIH hazards are primarily associated with which combination of hazard classes?

• A. Class 1 explosives only.
• B. Class 3 flammable liquids only.
• C. Class 6.1 toxics and some Class 2.3 gases.
• D. Class 7 radioactive materials.

Answer: (C)

TIH hazards come from substances that are dangerous to inhale. That’s why the most relevant classes are Class 6.1, which covers toxic materials, and Class 2.3, which includes poisonous gases. These materials can cause severe injury or death even at low concentrations, making inhalation the primary danger you must guard against when handling and transporting them. Other hazard classes—like explosives, flammable liquids, or radioactive materials—pose serious risks, but their main dangers aren’t inhalation toxicity, so they aren’t the focus when identifying TIH hazards.