From: "Stuart, Ralph" <Ralph.Stuart**At_Symbol_Here**KEENE.EDU>
Subject: Re: [DCHAS-L] Sars-CoV2 infectivity
Date: Fri, 26 Jun 2020 14:54:42 +0000
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID: 31500AAC-1FC7-4E8B-A454-955074FECE79**At_Symbol_Here**
In-Reply-To <620006003.3030882.1593111225714**At_Symbol_Here**>

> 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


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