Just saw a doku on spaceflight and they mentioned the Apollo spacecraft had a 100% oxygen atmosphere at 0.2bar or so, so humans can easilly survive in lowpressure environments as well, as long as the O2 pressure is adequate.
Just don't try to smoke or do anything that makes sparks. (such as wearing a synthetic sweater...you'd have to shave all your hair too.)
humans that live at sealevel also tend to have damaged lungs compared to mountain dwellers.
More moisture in the air, more microparticles in general, lung diseases etc.
Moisture is also a big factor actually for temperature tolerance.
in the cold high moisture is a liability, the air will be more conducting to heat, making it seem much colder.
in high heat environment high moisture reduces the ability to cool down and thus reduces activity, low moisture is only dangerous if there is no replacement water available.
Your corpse will last for ages there though.
Come to think of it, a low pressure environment will probably induce moisture loss as well.