Atmos, or The Air is On Fire.

[Clarks]

There were two issues caused by having gas mixing in a single location. One could light the whole station on fire by opening a few valves.
Most of the pipes were used to bring the gases back and forth from Atmos.


What would change.
Atmos would be regulated locally, with each machine covering just a sector of the station. For instance, one machine for Medbay and Research.

This machine, is a scrubber. It works like a rebreather. Inside are one or more cartridges each filled with a chemical compound. By default the cartridges clear the air mix of any CO2 (in real life, Calcium hydroxide is often use to trap CO2) or plasma.
But, by changing the contents of a cartridge, a traitor could cause the air scrubber to synthesize COs and plasma, and pollute the air.

The machine at the top of the mock-up regulates air temperature. It takes cold air from a closed loop of heath-exchange pipes which sits partially in space, and allows to set a ratio of heat transfer between the cold closed loop, and the warmer air from the station. (For those who were around during donut 1, it would work a bit like the TEG.)
To sabotage the machine, and force it to make the air hot as hell, one would have to re-route the heat-exchange pipes from space to a closed area, and light a fire on them.



Bonus sprites.
Scrubber and cartridge.

Heatsink.