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Physical effects of change in altitude

Physical effects of change in altitude
Altitude, feet Barometric pressure, mmHg Atmospheric PO2, mmHg PIO2, mmHg PAO2, mmHg PaO2, mmHg
0 760 159 149 103 98
2000 707 148 138 94 90
4000 656 137 128 85 80
5000 632 132 122 81 66
6000 609 127 117 77 64
8000 564 118 108 69 60
10000 523 109 100 61 53
PIO2: partial pressure of inspired oxygen; PAO2: partial pressure of alveolar oxygen; PaO2: partial pressure of oxygen in arterial blood 8000 feet represents the maximum allowable altitude in commercial aircraft.
Adapted from Gong H. Exposure to moderate altitude and cardiorespiratory diseases. Cardiologica 1995; 40:477.
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