What is a warm zone?

• A. Area for CP, support operations, and equipment staging
• B. Immediate area surrounding the hazardous materials incident
• C. Area between hot and cold zones where decontamination occurs
• D. Control zone

Answer: (C)

In hazardous materials response, zones are arranged to control contamination by separating dirty and clean areas. The warm zone is the buffer between the hot zone (the area immediately around the incident with highest contamination) and the cold zone (the clean area where command, medical treatment, and support operations occur). In the warm zone, decontamination happens and contaminated PPE is removed or cleaned so that people and equipment can move safely into the cold zone. This makes the warm zone the critical transition space where exposure risks are reduced before entering the uncontaminated areas.

So, the area between the hot and cold zones where decontamination occurs is the warm zone. The hot zone is the immediate hazardous area, the cold zone houses command and operations in a clean environment, and the other description doesn’t capture the specific decon function of the warm zone.