21 In the German study scientists measured average CO2 values in the inhaled air to be between 13,120 and 13,910 ppm for OP and FFP2 masks. This is a level that is six times higher than what the Federal Environmental Agency calls unacceptable. “This value is reached after three minutes under the mask,” (notrickszone.com) posted 3 years ago by seernewday 3 years ago by seernewday +21 / -0 5 comments share 5 comments share save hide report block hide replies
Weird! It's almost as if by wearing a mask, you're mostly breathing in your exhalations.