In HazMat operations, what are the hot, warm, and cold zones?

• A. Cold zone clean, non-contaminated; Warm zone decontamination and PPE doffing; Hot zone contaminated area where work occurs.
• B. Cold zone contaminated; Warm zone clean; Hot zone PPE only.
• C. Cold zone PPE doffing; Warm zone contaminated; Hot zone decontamination.
• D. Cold zone decontamination; Warm zone work; Hot zone clean.

Answer: (A)

In HazMat operations, separation of the scene into zones prevents spread of contamination. The cold zone is the clean, non‑contaminated area where personnel not directly handling the hazard operate. The warm zone is the buffer between hot and cold, where decontamination of personnel and equipment takes place and where PPE can be doffed in a controlled way. The hot zone is the contaminated area where the work with the hazard actually occurs and where fully protective PPE is required.

This arrangement—cold zone as clean, warm zone for decontamination and PPE removal, hot zone as the contaminated work area—best fits how contamination is contained and how personnel transition safely between levels of protection. The other options mix up which zones are contaminated or where decontamination and doffing belong, which would risk spreading contamination.