Is there enough oxygen at 35000 feet?

At the normal cruising altitude of an airplane (35,000 ft., or 10.650 m) atmospheric pressure drops to 3.8 psi -or 26% of the sea level pressure, therefore the quantity of oxygen in the air is also 26% of that found at sea level. This reduced oxygen content will lead to death due to hypoxia (lack of oxygen).



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Importance to Members And that at cabin altitudes above 14,000 feet pilots must use oxygen at all times. And that above 15,000 feet each occupant of the aircraft must be provided supplemental oxygen. All of this is spelled out in Federal Aviation Regulations Part 91.211.

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The general rule is that planes should have cabin pressurization when they go above 10,000 to 14,000 feet. Can a pilot depressurize a cabin? Most aircraft cabins are pressurized to an altitude of 8,000 feet, called cabin altitude.

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Traveling by airplane exposes people to decreased air pressure and lower than normal oxygen levels. For most people, these changes are not noticeable.

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The reason planes cruise at high altitudes is that they burn less fuel and can fly faster, as the air is less dense. At 30,000 feet and higher, it is also possible for aircraft to avoid weather systems, making it more comfortable onboard.

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If airplanes didn't pressurize their cabins, it could lead to insufficient oxygen as well as related medical problems like hypoxia. Airplanes need pressurized cabins because it ensures passengers, as well as crew members, receive an adequate amount of oxygen in the air they breathe.

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