For effective mass decontamination, which practice is emphasized?

• A. Decontam large numbers of people
• B. Focus exclusively on the most contaminated person
• C. Delay until the entire area is evacuated
• D. Use no water at all

Answer: (A)

Mass decontamination prioritizes processing as many people as possible as quickly as possible. When a hazmat release has the potential to affect a large crowd, the most effective approach is to set up a decon line or showers that can rapidly remove contaminants from many victims. This rapid, large-scale decontamination reduces the total contaminant load on individuals, lowers the risk of secondary exposure to bystanders and responders, and facilitates a faster move to safety for a whole group.

Focusing only on the most contaminated person can leave others without protection and can create delays or gaps where exposures continue. Waiting until the entire area is evacuated is not practical; it would leave many people at risk and hinder timely evacuation. Using no water at all contradicts standard decontamination methods, since water-based decontamination is effective at removing a wide range of contaminants from skin, hair, and clothing. Therefore, the best practice is to decontaminate large numbers of people.