How many DOT hazard classes exist?

How many DOT hazard classes exist?

• A. 6
• B. 7
• C. 9
• D. 10

Answer: (C)

Hazard classifications under the DOT are nine distinct classes, each representing a hazard type used for shipping and handling. These classes cover Explosives; Gases; Flammable liquids; Flammable solids; Oxidizers and Organic peroxides (within the same class, as subcategories 5.1 and 5.2); Toxic substances and Infectious substances (within class 6, with subcategories 6.1 and 6.2); Radioactive materials; Corrosive substances; and Miscellaneous dangerous goods. Subdivisions like 5.1 vs 5.2 or 6.1 vs 6.2 exist, but they don’t add to the total count—they’re parts of the broader class. That’s why there are nine hazard classes in total.

Hazard classifications under the DOT are nine distinct classes, each representing a hazard type used for shipping and handling. These classes cover Explosives; Gases; Flammable liquids; Flammable solids; Oxidizers and Organic peroxides (within the same class, as subcategories 5.1 and 5.2); Toxic substances and Infectious substances (within class 6, with subcategories 6.1 and 6.2); Radioactive materials; Corrosive substances; and Miscellaneous dangerous goods. Subdivisions like 5.1 vs 5.2 or 6.1 vs 6.2 exist, but they don’t add to the total count—they’re parts of the broader class. That’s why there are nine hazard classes in total.