Since getting this CO2 meter, I’ve found there’s a high correlation with being unfocused and/or irritable with 800+ readings. Reminder to get some fresh air, open the window, etc.

This is one of my favourite facts, and it’s so overlooked. In the astronaut Scott Kelly’s biography Endurance he writes about how constantly they had to repair the CO2 filter in the ISS and the effects high CO2 had in the crew and himself.

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