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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.
1 Unfortunately, they're also a form of air pollution: they're believed to have long-term (chronic) effects on people's health and they also play a role in the formation of ozone and smog. 2  Particulates: These are the sooty deposits in air pollution that blacken buildings and cause breathing difficulties.hoto: Air pollution is obvious when it pours from a smokestack (chimney), but it's not always so easy to spot.