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It's also possible that higher co2 levels could be making you tired. I have been seeing more and more studies on high co2 levels in crowded offices causing measurable effects.

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That makes sense, but also seems not too difficult to prove.

There was a paper or report floating around HN the other day, in which the Navy analyzed data from submarine crews, and could not reproduce the claimed effects of increased CO₂ concentrations in air. With that out there, I worry a definitive answer may not be so easy to establish.

Interesting. I will try to find that sub article.

Maybe open-offices that can’t install ERVs can use rebreathers instead?

I was reminded of this hackaday project...

https://hackaday.com/2018/05/29/monitoring-air-quality-one-s...

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