Which statement best describes the role of air-monitoring devices in structural rescue operations?

• A. They are optional and rarely used.
• B. They measure only temperature.
• C. They replace SCBA and other safety measures.
• D. When used correctly, air-monitoring devices help protect the safety of everyone around.

Answer: (D)

Air-monitoring devices serve to detect the atmospheric hazards inside a structure and provide real-time data to the team. They monitor oxygen levels and the presence of toxic or flammable gases, giving early warning of dangerous conditions so decisions can be made before and during entry. When used correctly, these devices protect the safety of everyone around by guiding actions—whether to vent, delay, shorten, or halt operations—and by signaling that additional precautions or PPE are needed. They are not optional, they do more than measure temperature, and they do not replace SCBA or other safety measures; instead, they work with them to create a safer overall operation.