12.2.1 Oxygen deficiency
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12.2.1 Oxygen deficiency

 Exposure to an atmosphere with a low concentration of oxygen does not necessarily produce any recognizable symptom before unconsciousness occurs, when the onset of brain damage and risk of death can follow within a few minutes. If the oxygen deficiency is not sufficient to cause unconsciousness, the mind is liable to become apathetic and complacent, and even if these symptoms are noticed and escape is attempted, physical exertion will aggravate the weakness of both mind and body. It is therefore necessary to ventilate thoroughly to ensure that no pockets of oxygen-deficient atmosphere remain. When testing for entry a steady reading of 21% oxygen is required.

Parent topic: 12.2 Health hazards
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