Can the Na'vi breathe an Earthlike atmosphere?

[Human No More]

Originally Posted by Clarke

Pandora's atmosphere is higher pressure than Earth's, which means it'll force itself through his nose. If that alone doesn't cause mortal damage, the pain of having his eyeballs destroyed will probably make him gasp, and thus inhale it.


Quoth Wiki:

Wrong.
Pressure is not necessarily higher, you're thinking of density. Vehicles and buildings are pressurised above ambient so in case of minor damage, atmosphere leaks out and not in. Pandora's atmospheric pressure is actually 0.9atm, so presumably the vehicles and buildings are ~1.0 or more.

H2S is not toxic on skin contact except as a liquid. He would have had some eye irritation, as well as to mucous membranes of nose/throat, but it is perfectly possible not to actually inhale it.