[quote=@Skallagrim]
He has no inherent advantage.

Oh and I failed to mention, I will be making flavor text posts in the IC. 
[/quote]

Well, both our characters have a relatively human physiology which requires oxygen to work to full capacity. In the low-oxygen environment both of us would be inconvenienced, but his character has a gas mask to work around it. So in the strictest scientific sense he has a clear advantage because of the environment.