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A comment on On whether changes in bedroom CO2 levels affect sleep quality. Parent comment

Re:On whether changes in bedroom CO2 levels affect sleep qua... by wcoenen on Tuesday January 22, 2019 @12:27PM (#18970129)
> I believe it was less than 400ppm at the start

Then this must have been before 2016. Atmospheric CO2 concentration has always been higher than 400 ppm since that year.

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