Oxygen

Oxygen is an unusual resource in that it cannot be stored or manufactured in excess. It can only be stored in Halls, and can only be produced by Oxygen Generators.

Colonists breathe oxygen as they walk through halls and Structures. It is possible for a large cluster of colonists to suck all the air out of a room, so try to prevent them from making any friends.

A quick overview of the oxygen levels throughout the colony can be accessed by clicking the button on the main GUI over the power/food/water/population indicators.