Lunar Atmosphere

Diurnal temperature range: >100 K to <400 K  (roughly -250 F to +250 F)
Total mass of atmosphere:  ~25,000 kg
Surface pressure (night): 3 x 10-15 bar  (2 x 10-12 torr)
Abundance at surface: 2 x 105 particles/cm3

Estimated Composition (particles per cubic cm):
    Helium 4 (4He) - 40,000 ; Neon 20 (20Ne) - 40,000 ; Hydrogen (H2) - 35,000
    Argon 40 (40Ar) - 30,000 ; Neon 22 (22Ne) - 5,000 ; Argon 36 (36Ar) - 2,000 
    Methane - 1000 ; Ammonia - 1000 ; Carbon Dioxide (CO2) - 1000 
    Trace Oxygen (O+), Aluminum (Al+), Silicon (Si+) 
    Possible Phosphorus (P+), Sodium (Na+), Magnesium (Mg+)

Information from: http://nssdc.gsfc.nasa.gov/planetary/factsheet/moonfact.html

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