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

8000 feet represents the maximum allowable altitude in commercial aircraft.

PO₂: partial pressure of oxygen; PIO₂: partial pressure of inspired oxygen; PAO₂: partial pressure of alveolar oxygen; PaO₂: partial pressure of oxygen in arterial blood.

Adapted from Gong H. Exposure to moderate altitude and cardiorespiratory diseases. Cardiologica 1995; 40:477.

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