Which of the following could be a potential ignition source at hazmat incident scenes, depending on context?

• A. Cylume sticks
• B. Inert gas
• C. Radios and flashlights
• D. Contaminated water

Answer: (C)

Ignition sources at hazmat scenes come from anything capable of producing heat, sparks, or an electrical arc in the presence of flammable vapors. Radios and flashlights fit this risk because they contain batteries, switches, and circuits that can spark or overheat if damaged or used near vapors. In a context with a flammable atmosphere, that spark or heat could ignite the vapor cloud, making such devices a potential ignition source. Inert gas won’t ignite, and contaminated water doesn’t supply energy to burn. Cylume sticks rely on a chemical light reaction and are designed to be non-sparking and emit relatively little heat, so they’re not typically considered ignition sources in this scenario.