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Making the world better, one answer at a time. Thin air is caused by low oxygen pressure at high altitudes. The lack of oxygen makes the air less dense. Thin air is caused by low oxygen pressure at high altitudes. The lack of oxygen makes the air less dense.
Air is a mixture of gases, predominately oxygen and nitrogen. Oxygen is a pure gas element. People at high elevations experience thin air, which can cause shortness of breath. Divers use various mixtures of breathable gas, including ones that contain oxygen and helium, when they explore the seas.