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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.
What is the primary cause for the thinning of the ozone layer? the breakdown of ozone molecules due to a chemical reaction with free chlorine in the atmosphere What are the main risks of indoor air pollution in developing countries? Biomass and coal are burned in open pit fires without the right fuel to air ratio, which causes incomplete combustion.