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Uphill
Have you ever felt the pressure in your ears when you are going up or downhill?
What you feel is the differences in the air pressure. The ear drum inside the ear bulges in or out a little bit when the air pressure changes quickly.
High in the sky the air pressure falls, and the ear drum bulges out a bit, because the air pressure inside your head remains the same.

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Downhill
Close to the ground the pressure is higher than up in the sky, just like the pressure at the bottom of the sea is greater than the one at the surface.
If you descend quickly from some place high, you can feel the ear drum bulging in a little bit.

The wing of a bird or the rotor blade of a wind turbine creates a pressure difference between the two sides that makes the bird fly and the rotor turn.

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Air Pressure
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