Which hazard class includes Poisons/Infectious Substances?

• A. Flammable/Combustible Liquids Class
• B. Poisons/Infectious Substance Class
• C. Oxiders Class
• D. Compressed Gases Class

Answer: (B)

Hazards are grouped by the type of danger they pose to health and safety. Poisons and infectious substances are placed in their own hazard class because they primarily threaten health through exposure, poisoning, or infection rather than through fire or explosion. This class covers materials that can cause illness if inhaled, ingested, or in contact with skin, so it emphasizes control measures, proper labeling, and safe handling to protect responders and workers. The other classes focus on different risks: flammable/combustible liquids ignite and burn, oxidizers can intensify fires by providing oxygen, and compressed gases involve hazards from pressure, toxic inhalation, or rapid release. Therefore, poisons and infectious substances belong to the Poisons/Infectious Substances class.