GURPS Space question

[David Johnston2]

Originally Posted by awesomenessofme1

The description for Marginal (Low Oxygen) says you treat the atmosphere as one pressure class lower. Does that include for the purposes of determining habitability? And if so, if that reduces the effective pressure from Very Dense to Dense, do you still lose the 1 point because it's Marginal, even though it's actually helping you?

Two words for you.

Nitrogen narcosis.

It does help you by giving you a net +1 habitability but human lungs aren't really designed to handle nitrogen under that much pressure.