On Wednesday, May 6, 2020 the ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU> On Behalf Of Anna Sitek said in part:
>If you are not using masks in the labs are you discouraging talking as another means of source control? See https://www.nature.com/articles/s41598-019-38808-z
>
I am confused. The third bullet, above is quite specific. The first bullet is less specific but seems to cover the some topical region of speech produced particle emission vs. cough. The information in the two bullets seems inconsistent, or perhaps contradictory would be a better term. Both appear to be based on studies referenced in the above link. Given the contradictory results, what is their value and why relate them in this context?
Peter Zavon, CIH
Penfield, NY
PZAVON**At_Symbol_Here**Rochester.rr.com
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