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How to handle situations such as lacking oxygen or being poisoned in confined spaces?

If employees are found lacking oxygen or fainted due to toxic gases, ventilators must be immediately activated first. Rescuers, if not wearing effective breathing tools (such as air breathing mask), must not perform CPR to avoid more casualties. Casualties are given CPR or oxygen-breathing mask after being moved to a safe place and at the same time, seek assistance from medical institutions.