At what height can you no longer breathe?

Death zone It refers to altitudes above a certain point where the amount of oxygen is insufficient to sustain human life for an extended time span. This point is generally tagged as 8,000 m (26,000 ft, less than 356 millibars of atmospheric pressure).



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Above 40 000 feet, positive pressure breathing with 100% oxygen is required. Without positive pressure breathing, even very short exposure to altitudes greater than 43 000 feet leads rapidly to unconsciousness. Aircraft cabin pressurisation systems were developed mainly to prevent hypoxia.

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When the altitude of an airplane is less than 12,500 feet, there is no supplemental oxygen required for anyone in a private plane. From 12,500 feet to 14,000 feet, supplemental oxygen must be used by the required flight crew for any portion of the flight that is more than 30 minutes.

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When you go to a high elevation there is less air pressure. The lower air pressure makes air less dense (thinner) and so there is less oxygen in the air you breathe. At the top of Mount Everest there is only ? of the oxygen available as there is at sea level.

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For best protection, you are encouraged to use supplemental oxygen above 10,000 feet MSL. At night, because vision is particularly sensitive to diminished oxygen, a prudent rule is to use supplemental oxygen when flying above 6,000 feet MSL.

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For Part 91 General Aviation operations the required flight crew must use supplemental oxygen for any portion of the flight that exceeds 30 minutes above a cabin pressure altitude of 12,500 feet mean sea level (MSL) up to and including 14,000 feet (MSL).

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