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Re:Rising CO2 levels may trigger cognitive impairment, says ... by detaro on Tuesday May 12, 2020 @01:18PM (#23156607)
For CO2 specifically, one offline option is the "CO2Meter RAD-0301", also available as "TFA Dostmann AirCO2ntrol Mini" and possibly other labels. They have an unofficial USB interface too: https://news.ycombinator.com/item?id=22764488

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