The Moon’s gravity is not strong enough to hold an atmosphere in place like on earth.
Although the moon technically has no atmosphere, some elements such as helium-4 have been detected by Chandrayan-1 and found to vary with latitude.
Small traces of water vapor have even been detected and is possibly generated from the sublimation of water ice in the regolith.
A significant amount of the gases are swept away by the solar wind’s magnetic field as there is not enough gravity to retain the molecules.
Consequently, the environment above the surface of the planet is uniformly the same as in Earth’s exosphere.