What is the first action when entering an enclosed room after a terrorist incident where toxic agents may be present?

• A. Don your mask before entering the room
• B. Enter quickly to render aid
• C. Call for backup and stay outside
• D. Ventilate the room before entry

Answer: (A)

In a scenario with potential toxic agents, protecting yourself first is the priority. The first action is to don respiratory protection before entering, so you don’t inhale harmful agents as you assess the scene and begin to help. Inhalation is the most immediate danger, and having a mask or respirator in place lets you perform entry and rescue more safely rather than becoming another victim.

Rushing in to render aid without protection risks your exposure and could contaminate you further, which would reduce your ability to assist others. Waiting to ventilate or to call for backup outside the room delays care and can spread contaminants or leave victims unprotected inside. Ventilation before entry can disperse or aerosolize agents, increasing exposure risk. Therefore, putting on the mask beforehand is the most appropriate first step.