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In a healthy spacecraft, the CO2 meter should climb no higher than 2 or 3 millimeters of mercury. When it rose above 7, the crew was instructed to change their lithium hydroxide canisters. If it was allowed to rise above 15, the first signs of CO2 poisoning would set in.

Carbon Dioxide Threatens Astronauts

Lovell & Swigert work with temp hose connections. CO2 scrubber in background

The CO2 scrubber