Comment What about the nitrogen? (Score 2, Informative) 280
Air on earth is ~78% nitrogen by volume (and ~75% by mass), whereas moon base air would be 100% oxygen. There seems to be a couple of problems with this:
1.) At 100% atmospheric oxygen, clothing and hair (and lots of other things I'd guess) become highly flammable, even explosive.
2.) People aren't designed to breathe pure oxygen for extended periods. While it's essential for life, it's also rather toxic - http://en.wikipedia.org/wiki/Oxygen#Precautions
So, unless there's another element up there to dilute the oxygen down, you'd still need to take all the nitrogen you need with you.
1.) At 100% atmospheric oxygen, clothing and hair (and lots of other things I'd guess) become highly flammable, even explosive.
2.) People aren't designed to breathe pure oxygen for extended periods. While it's essential for life, it's also rather toxic - http://en.wikipedia.org/wiki/Oxygen#Precautions
So, unless there's another element up there to dilute the oxygen down, you'd still need to take all the nitrogen you need with you.