Why is the dissipation of molecules from the atmosphere possible only at high altitudes, although, according to the Maxwell-Boltzmann

Why is the dissipation of molecules from the atmosphere possible only at high altitudes, although, according to the Maxwell-Boltzmann distribution, at any altitude and at any temperature, there are molecules in the atmosphere with velocities greater than the escape velocities?

In the lower layers of the planet’s atmosphere, molecules are prevented from escaping by their frequent collisions.

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