The primary hazard to responders rescuing victims in the vicinity of a fire involving products of Hazard Class 1 is:

• A. Inhalation
• B. Ingestion
• C. Injection
• D. Explosion

Answer: (D)

When explosives are involved in a fire, the most immediate danger to rescuers is the potential for a detonation and the massive blast it releases. The explosion produces a high overpressure, flying shrapnel, heat, and a shock wave that can cause fatal injuries and structural collapse in an instant. That blast risk is the dominant threat because it can occur suddenly and affect responders who are trying to reach victims, even if the fire itself isn’t yet fully under control. Inhalation hazards from smoke or toxic fumes and other exposure risks are serious, but they tend to be secondary to the explosive blast in this scenario. The key takeaway is to recognize that the blast and its debris field drive the safety decisions—maintaining distance, establishing a perimeter, and relying on specialized teams before attempting rescues.