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Tamamo
No. 2698 [Open] [Reply]
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 >>/2696/
Permissible exposure levels of CO2 are 5000ppm here as well, even 30000ppm for a short time. But the government now strongly recommends keeping levels under 1100ppm because CO2 is a proxy for virus aerosols so good ventilation helps to reduce COVID-19 infections. 
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