In hazmat response, which zone is designated as the decontamination area and is not the most contaminated?

• A. Hot zone
• B. Cold zone
• C. Warm zone
• D. Transition zone

Answer: (C)

The important idea is how hazmat response zones separate contaminated areas from clean ones so decontamination can occur safely. The zone with the highest contamination is the hot zone, where entry is restricted and protective gear is worn to prevent exposure. The decontamination process happens in the buffer area between the hot zone and the clean area—the warm zone. This zone is specifically designated for decontamination of personnel and equipment before anyone moves into the clean area, so it isn’t the most contaminated. The cold zone remains the clean area where non-contaminated operations, support, and medical care take place.

Some protocols also reference a boundary area called a transition zone, but the space designated for actual decontamination and exit from contamination is the warm zone.