Mon May 16, 2022 – 10:43 am EDT
(Daily Sceptic) – Wearing a face mask results in exposure to dangerous concentrations of carbon dioxide in inhaled air, even when the mask is worn for just five minutes when sitting still, a study has found.
With surgical masks, the CO2 concentration of inhaled air exceeded the danger zone of 5,000 ppm in 40% of cases. With FFP2 respirators it exceeded it in 99% of cases. The CO2 concentrations were higher for children and for those who breathed more frequently.
The study, a pre-print (not yet peer-reviewed) from a team in Italy, used a technique called capnography to take the measurements of CO2 in inhaled air over the course of five minutes, following a ten minute period of rest, with participants seated, silent and breathing only through the nose. A medic took measurements at minutes three, four and five, with an average of the three measurements being used in the analysis.
The study found the mean CO2 concentration of inhaled air without masks was 458 ppm (Parts per million). While wearing a surgical mask, the mean CO2 was over 10 times higher at 4,965 ppm, exceeding 5,000 ppm in 40.2% of the measurements.
While wearing
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