If an operator is trapped in a room with leaking chlorine gas and lacks a mask, what should they do?

When faced with a leak of chlorine gas, it is crucial to minimize exposure to the harmful substance. Keeping the mouth closed and maintaining a high head position helps reduce inhalation of the gas, which is heavier than air and can accumulate near the ground. Walking calmly towards an exit, while actively minimizing exposure, is a practical and safer approach compared to other actions that might exacerbate the situation.

Running to the nearest exit may cause panic and lead to increased inhalation due to rapid breathing, which could worsen the effects of gas exposure. Similarly, staying still can lead to prolonged exposure to the gas and the possibility of severe harm. Signaling for help loudly might draw attention, but it does not effectively address the immediate danger of gas inhalation. Thus, managing to exit while consciously minimizing gas exposure by keeping the mouth closed and head raised is the most appropriate and protective response in this scenario.