In hazmat zone terminology, which zone is typically used for decontamination operations?

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

Answer: (D)

Decontamination operations occur in the warm zone because it serves as the controlled transition between the contaminated area and the clean area. This zone allows responders to perform decon procedures, remove or sanitize contaminated PPE, and contain any decontamination runoff before people or equipment move into the clean zone. Keeping decon in the warm zone helps prevent the spread of hazardous material to areas and personnel that are not equipped to handle contamination. The hot zone is where the hazardous material is present and poses the greatest risk, while the cold zone is kept free of contamination for treatment, support, and logistics. The green zone isn’t a standard hazmat designation for decon, so it isn’t used for the decontamination process.