Other than over-expansion, I think that's likely the reason why I've been having such a hard time maintaining pressure within my base: I've been playing as if contaminated oxygen is a bad thing because it felt really cheap not to.devak wrote: I think the main reason it's not in yet is that dirty air is extremely hard to deal with. The filters seem to destroy a LOT of contaminated air in order to obtain fresh air, and it makes maintaining adequate air levels hard. So the game definitely needs a better way of dealing with contamination.
I'm sure that will be taken care of in the near future.