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Re:Building the Pocket CO2 Project by ourlordcaffeine on Thursday April 27, 2023 @06:42AM (#35726065)
Levels above 1000ppm are shown to cause cognitive impairment. 3000ppm is absolutely harmful.

>our lungs are constantly dealing with much higher concentrations

After gas exchange. Not with inhaled air.

Re:Building the Pocket CO2 Project by voxelghost on Thursday April 27, 2023 @08:19PM (#35736116)
>After gas exchange. Not with inhaled air.

gas exchange is continuous, not a discrete event that only takes place just after fresh air enters the lungs.