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. Author manuscript; available in PMC: 2022 Sep 27.
Published in final edited form as: J Breath Res. 2021 Sep 27;15(4):10.1088/1752-7163/ac2589. doi: 10.1088/1752-7163/ac2589

Table 2:

Examples of large human populations adapted to breathing normally at different altitudes. As elevation increases, ppO2 decreases and the human adapts with various mechanisms.

Location Metropolitan Population (estimate in millions) Altitude (feet) Air Pressure (atm) ppO2 (atm)
New York City, NY, USA 18.83 33 1.00 0.21
Delhi, India 30.33 709 0.97 0.20
Santiago, Chile 6.77 1615 0.94 0.20
Denver, CO, USA 3.21 5000 0.83 0.17
Kabul, Afghanistan 4.27 5602 0.81 0.17
Mexico City, Mexico 21.78 7350 0.76 0.16
Commercial Airline Cabin NA 8000 0.74 0.16
El Alto/La Paz, Bolivia 2.91 13600 0.60 0.13
Denali Summit, AK, USA NA 20208 0.48 0.10
Mount Everest Summit, Nepal NA 29000 0.31 0.07
*

NA: Not applicable