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Previous by Date: Subject: Re: [DCHAS-L] Innovative face shields Date: Friday, June 26, 2020 at 10:37:54 AM Author: Monona Rossol <0000030664c37427-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU> |
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> 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
Ralph Stuart, CIH, CCHO
Environmental Safety Manager
Keene State College
603 358-2859
ralph.stuart**At_Symbol_Here**keene.edu
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