The layer of air just above the ground is known as the boundary-layer, and it is essentially separated from the rest of the atmosphere. At night-time the layer is exceptionally thin, just a few 100 meters, whereas during the day-time it grows up to a few kilometers. And this is the basic reason why the temperatures during nights are more sensitive to warming than the day.
This daily cycle in temperature directly affects human health, as it can trigger temperature-related fatalities. However, it also indirectly affects the human health by controlling the growth rates of vegetation, and hence affecting the length and stability of crop-growing seasons.
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