Which term describes a condition, substance, or device that can directly cause injury or loss—the source of a risk?

• A. Hazard
• B. Hot Zone
• C. IDLH
• D. ICS

Answer: (A)

A hazard is anything in the environment that has the potential to cause harm. It’s the source of risk because the presence or release of that condition, substance, or device could injure people, cause illness, or lead to property damage if not controlled. In firefighting and safety work, identifying hazards—like a leaking gas line, exposed live electrical gear, or a structurally compromised floor—is the first step in risk assessment and informs the controls you apply to keep everyone safe.

Other terms describe different ideas: a hot zone is the area where exposure to the hazard is likely or ongoing; IDLH refers to an atmosphere that is immediately dangerous to life or health (a condition, not the source of risk itself); ICS is the incident command system, the framework for managing operations, not a hazard.