The temperature of air everywhere around the globe changes layer by layer. Within the troposhphere, the layer that is closest to the earth, temperature decreases with increasing altitude. Since hot hair rises and the sun warms the air that is closest to the earth, this causes the air in the troposphere to mix and disperse pollutants. However, apparently the opposite it true in the Sahara, creating an inverted temperature profile and causing the air to be stagnant like it is in the statosphere where air rises in temperature with increasing altitude.
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