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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 Matrixik on Tuesday January 22, 2019 @04:30AM (#18967128)
Also if someone is searching for PM2.5 particle monitoring:

https://smartairfilters.com/en/blog/how-accurate-are-common-...

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