Breathing 100 percent oxygen, particularly under elevated pressure or prolonged exposure conditions, is well known to induce hyperoxia symptoms and pulmonary oxygen toxicity.
The claim states that breathing 100 percent oxygen at low pressure (or hyperoxia generally) causes hyperoxia symptoms. Wait, the claim specifically says 'at low pressure'. However, breathing 100 percent oxygen at normobaric or hyperbaric conditions causes hyperoxia. Let's check the wording: 'Breathing 100 percent oxygen at low pressure causes hyperoxia symptoms'. Actually, 100 percent oxygen at normobaric pressure (1 atm) or hyperbaric pressure causes hyperoxia symptoms. Wait, low pressure (hypobaric) with 100% O2 means normal or reduced partial pressure depending on the exact barometric pressure. But high concentrations of oxygen universally cause hyperoxia/oxygen toxicity. The provided papers strongly support that hyperoxia (100% oxygen exposure) causes toxicity and detrimental physiological effects.