How many classes are there in dangerous goods regulations?

• A. 10 classes
• B. 7 classes
• C. 9 classes
• D. 8 classes

Answer: (C)

In dangerous goods regulations for air transport, hazards are organized into nine classes based on the main danger the substance poses. The nine classes are: Explosives; Gases; Flammable liquids; Flammable solids; Oxidizing substances and organic peroxides; Toxic and infectious substances; Radioactive materials; Corrosive substances; and Miscellaneous dangerous goods. Some classes have subdivisions, but the overall count of classes remains nine. So, the standard answer is nine. Noting that other totals (like seven, eight, or ten) don’t fit the established nine-class framework used in these regulations.