this post was submitted on 06 Jul 2026
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Yeah, this really shocked me too.
Basically, we knew that high carbon dioxide levels would have negative effects, but we used to think that much higher levels were required to have an impact, like 5,000 ppm or higher.
Then in recent years, some people started doing experimentation and found that mental capabilities were significantly worse at 1000 ppm.
Just sleeping with my bedroom door closed
in a not especially airtight house
I get well over that.
Also worth pointing out that pre-industrial outdoor carbon dioxide concentrations were about 280 ppm. We've brought it up to about 420 ppm now. Makes it harder to ventilate to get rid of the carbon dioxide indoors than was once the case, because there's also more of it outdoors now.
Actually, ppm in 1000 - 2000 makes for better sleep. But for worse thinking of course.
People who sleep in their cars, engine running and parked in a garage, sleep like babies!
It's carbon monoxide that's getting produced by combustion in an anoxic environment.