I would like to thank everyone for all the excellent responses and answers.

So my understanding now:

Pressure in space? 0 psi generally.
Pressure in current spacecraft? 1 ATA or 14.7 psi
Breathing mix in spacecraft? Air or basic NeO2
Breathing mix in spacesuit? O2 with higher Partial Pressure because of lower suit pressure of around 7 psi

I now wonder how Co2 is scrubbed and if gasses are reclaimed?
Gasses obviously are taken onboard compressed, but I wonder if cylinders are similar to ones used on Earth?

Makes me wonder how the space station is re-supplied or Mir?