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This is because there is less atmosphere at higher altitudes and, therefore, less oxygen. At 5500 metres, the air pressure is half that of sea level. Around 5500 metres, is the limit for human habitation. At 8900 metres (top of Everest), the pressure is 30% of sea level. 10000 metres is the limit of the lower atmosphere. Because there is less oxygen, one has to take deeper breaths to get the same amount of oxygen.

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