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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 higher in the atmosphere is at a lower pressure, so we say it is thin.Up high, there is less oxygen pressure so your breathing is strained, and there is less air resistaâ¦nce to a flying object. Air molecules are affected by gravity like anything else, so there tend to crowd near the surface of the earth.