@Trenton_Hoshiko
And this related page, also archived now
https://archive.cdc.gov/www_cdc_gov/coronavirus/2019-ncov/community/ventilation.html
"One potential target for the baseline concentrations that is used to represent good ventilation is CO2 readings below 800 parts per million (ppm).... If unable to get below your target CO2 value, increased reliance on enhanced air filtration (including in-room HEPA air cleaners) may be necessary."
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text/gemini
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