What are the two categories of hazards during a structural collapse?

• A. Physical hazards & Environmental hazards
• B. Structural hazards
• C. Chemical hazards
• D. Biological hazards

Answer: (A)

The two broad hazard categories in a structural collapse are physical hazards and environmental hazards. Physical hazards come from the structure itself—unstable floors, falling or shifting debris, sharp edges, exposed rebar, and other immediate danger that can cause injury through contact or sudden movement. Environmental hazards are about the surrounding conditions that affect safety, such as smoke or toxic gases in the air, dust, poor visibility, extreme temperatures, water or sewage intrusion, and other atmospheric factors that can impair breathing, heat stress, or movement. Understanding these two kinds helps responders assess danger quickly: first the immediate physical threats from the collapsing structure, then the environmental conditions that can complicate rescue work. Note that chemical or biological hazards are typically considered part of environmental hazards in this framework, rather than separate categories.