Or, in the case where a worker is unable to endure is accompanied by a specific period of time. Browning choke head dizzy lacks oxygen. Will have to come out of the area immediately.
Or in cases where the worker can not abide by a set time period. Dizziness, respiratory distress, hypoxia caused heads to be out of the immediate area.
Or where workers can't stand according to the time limit. Symptoms of dizziness, breathing difficulties, lack of oxygen, will have to come out from the area immediately.