Smoking is prohibited when loading or unloading which of the following?

• A. Class 5 (OXIDIZERS)
• B. Class 1 (Explosives)
• C. Class 3 (Flammable Liquids)
• D. Class 2 (Gases)

Answer: (A)

Oxidizers create an environment that can dramatically intensify fires. When loading or unloading these materials, a cigarette or any smoking source can emit a flame or spark that ignites nearby fuels or even the oxidizer itself, leading to a rapid, dangerous fire or explosion. That’s why smoking is prohibited in these operations, because the ignition risk is especially high with oxidizers. Other hazardous classes require caution as well, but the prohibition is most critical for oxidizers due to their tendency to promote combustion.