What does the term monitor mean in CBRN reconnaissance?

• A. Active scanning of the environment to detect hazards.
• B. Checking the environment using passive measures for hazards.
• C. Reporting hazards after they occur.
• D. Measuring chemical concentrations with laboratory analysis.

Answer: (B)

In CBRN reconnaissance, to monitor means to keep watch over the environment through passive observation. It involves checking for hazards using instruments or methods that do not emit energy into the surroundings, relying on ambient signals or natural responses to detect changes. This approach aims to detect elevated levels, anomalies, or trends in real time or near real time so that early warning and situational awareness can be maintained without actively disturbing the environment.

This is different from active scanning, which uses emitted energy to probe the area; from simply reporting hazards after they occur, which is reactive; and from laboratory analysis, which is done in controlled settings and isn’t real-time field monitoring.