> 900 to 1000 ppm CO2 is also where documented effects on mental acuity can be shown. It's a nice number.
Is there a reference for this? I just had one of our librarians who had been wearing a cloth mask for an hour exhale into a CO2 meter and he hit 3500 ppm. After wearing a cloth mask for 20 minutes, I max out around 1500, so I suspect that the longer wearing periods could become productivty problem.
Ralph Stuart, CIH, CCHO
Environmental Safety Manager
Keene State College
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