alt Hacker News> Noticeable cognitive impairment starts in the 700-1000ppm range
The US navy failed to detect such effects in submarine crew, even at much higher levels like 10,000 ppm.
Another reason to be skeptical is that exhaled breath is 4% CO2 (40,000 ppm!). Therefore a few thousand extra ppm in the inhaled air should not make much of a difference to the homeostasis mechanisms in our bodies.
Replies
progbits • yesterday at 5:05 PM
See my sibling comment for meta-analysis that disagrees with you. Would love to see citation for those navy experiments.
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I don’t need to look at studies in other people, I notice and feel the effects directly at high CO2 levels, such that I can tell when it it too high before checking the meter.
I’d need to look at the study, but I also suspect the submariners would be used to high CO2, and also not experienced enough in doing focused creative or knowledge work for impaired abilities there to be detectable.