This has recently been studied become a political issue in Switzerland. Air quality is unsurprisingly bad in class rooms.
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My buddy had his engineering kids do this in our school. Lot of rooms hit > 1000 ppm by the afternoon.
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never thought about it but looking back, yea, i regularly got out of school high off of oxygen deprivation. >w.t.f.
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. Banned in Sweden. SubGenius, Zhuangist, white-hat troll. Defrocked mathematician. Brain problems.