I asked a close friend of mine and this was his response. (Which admittedly, I was lacking knowledge lol).
Quote (Wowzers @ Apr 5 2011 01:17pm)
My question is, why did God have to go down to stop them? Who did he need help from? And God being who he is, why wouldnt God just let them find out at some point they were going to run out of air?
Genesis 11:4
Then they said, “Come, let us build ourselves a city, with a tower that reaches to the heavens,
so that we may make a name for ourselves; otherwise we will be scattered over the face of the whole earth.”
The "making a name for ourselves" in Hebrew language indicates that the same word used there equals the word, "God" which was suppose to be meant as an object to be worshiped (Basically they are saying, let us become gods ourselves) So in essence these people were wanting to be immortalized and be worshiped by their descendants and God wasn't going to be idle and let that happen.
The latter part of the "otherwise we will be scattered over the face of the whole earth" is going against the divine calling that God commanded to Noah in Genesis 9:1. The reason outside of wanting to make name for themselves was so that they will not be scattered (thus not filling up the earth). Naturally the population increase would force these people to move away further but if this tower (which by the way, when they say that it will reach the heavens, in Hebrew language, it just means that it'll be quite tall) were to be completed, people would try to stay close to their proud establishment and be acknowledge as "gods" (as the previous statement would say).
If you understand the first two part, I guess the whole running out of air portion of the question becomes invalid.
Hope that helps.