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A comment on Is Conference Room Air Making Us Dumber?. Parent comment

Re:Is Conference Room Air Making Us Dumber? by JohnJamesRambo on Wednesday May 08, 2019 @11:32AM (#19859777)
I don't use it for confined spaces, so 5000 ppm is plenty for me. If any building I am in is over 5000 ppm I need to leave immediately!

https://www.burntec.com/images/co220b.jpg

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