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I really enjoyed this Smarter Every Day episode that talks about maintaining air quality on a submarine: https://www.youtube.com/watch?v=g3Ud6mHdhlQ

that is pretty darn cool, not sure how to convert that torr to ppm though, in they video they mentioned it's partial pressure? so sounds like one is able to work out percentages therefore ppm by the reading?

To convert a partial pressure in torr (mmHg) to ppm, you divide the partial pressure by the total atmospheric pressure (both in torr) and multiply by 1 million.

I'm led to believe that the CO2 concentrations still routinely go above 2000 ppm though. Is that right?

Is there a "dad with a thermostat" joke in there somewhere, only applied to CO2? :)