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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.
When we fan ourselves, we make the air move and it is felt as wind. What makes air move during windy weather? This is because of unequal heating, temperatures at different places are not the same. As the warmer air expands, the density and pressure of air decrease. The surrounding cooler air flows in to fill the void and wind develops. In Hong Kong, windy weather is usually caused by monsoon or tropical cyclone.