Which category is NOT included in DOT Hazard Class 6?

• A. Liquid poisons
• B. Infectious substances
• C. Poison solids
• D. Poison gases

Answer: (D)

The correct answer is poison gases, as this category is not listed under DOT Hazard Class 6. The Department of Transportation (DOT) classifies hazardous materials into various categories to streamline safety regulations for transportation. Hazard Class 6 specifically focuses on toxic substances, which are further divided into two main categories: poisons (or toxic substances) and infectious substances.

Liquid poisons cover substances that are harmful or fatal when ingested or come into contact with skin. Infectious substances include any material containing pathogens capable of causing disease in humans or animals. Poison solids refer to solid forms of toxic substances that are hazardous in terms of exposure or ingestion.

On the other hand, while gases can be toxic, they are typically classified separately under DOT Hazard Class 2 as flammable or non-flammable gas categories. This distinction helps ensure that gas-related hazards are managed appropriately, considering their unique characteristics and risks during transportation.