Breathable Mix

Breathable mix atmospheres can support human life without additional equipment or gengineered modification. Any world that has a human population in the millions or more almost certainly has a breathable mix atmosphere.

While the air is breathable, almost every world has its own subtle cocktail of inert gases, atmospheric contaminants, and other odoriferous ingredients. For spacers accustomed to the filtered air supply of a starship, the “new world stink” of a fresh planet fall can be maddening, as few linger long enough to get used to the smell of the local air. Attempting to explain the source of this discomfort to the locals rarely results in positive results. Some spaceport bars make a point of their air filtration and composition mixers.