Why Does the Moon Have No Atmosphere?

Answer

The reason there is no atmosphere on the moon is because the moon, due to its size, has insufficient gravitational pull to counter the escape velocity of gas molecules thus there is no air. This escape velocity, if exceeded, removes objects from the gravitational pull of a body.
1 Additional Answer
The moon doesn't have an atmosphere because there is nothing living to replace the gases that are lost into space. The moon doesn't have anything holding these gases in place to create an atmosphere. You can find more information here: http://www.astro.uu.nl/˜strous/AA/en/antwoorden/maan.html#v99
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