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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.
The same would be true of particles and other pollutants in the air. TO THE EDGE OF SPACE. All of those gases and particles are not evenly distributed in the atmosphere, And the atmosphere is not evenly distributed by mass or weight. The densest and heaviest part of the atmosphere is near the Earth. The atmosphere becomes thinner as you go higher above the Earth's surface.