The gas makes up around 0.04 percent of all inhaled air, for comparison, and the Department of Agriculture said safe levels should be below 0.5 percent for eight-hour exposure. Masks provide breathing resistance and create a dead space that traps CO2, leading to more inhaled and re-breathed CO2, the reviewers said.
In another study in Italy, scientists measured the air under surgical masks worn in a lab and found a concentration between 0.22 and 0.29 percent within five minutes.
Within 30 minutes, the CO2 concentration rose to roughly 2.8-3.2 percent. One mask study conducted in Germany, researchers measured the CO2 concentration of air behind surgical masks worn by 15 healthy men.
They found that after wearing a mask for more than five minutes, CO2 levels in the inhaled air rose to between 1.4 percent and 3.2 percent. The German research team gathered data from 43 previously published studies on exposure to CO2, mask-wearing and pregnancy. Respiratory acidosis due to facemasks is unlikely although short-term side effects might affect people with chronic lung disease.' He said: 'I wouldn’t say this happens, because the body adjusts the pH, the acid/base balance very quickly. ' reduced verbal, motor, and overall cognitive performance of two full standard deviations in scores in children born during the pandemic,' the researchers wrote in the paper, published in the journal Heliyon.īut the study could not conclusively prove that the masks were directly responsible for any of these complications.ĭr Stuart Fischer, an emergency care physician in New York, questioned whether there was a 'toxic buildup' of CO2. A third study found that three percent CO2 (equivalent of 0.8 percent for humans) in pregnant rats caused stillbirth and birth defectsĪlluding to the surge in stillbirths during the pandemic, the German researchers said: 'Circumstantial evidence exists that popular mask use may be related to current observations of a significant rise of 28 percent to 33 percent in stillbirths worldwide.' Another found that male mice exposed to 2.5 percent CO2 for four hours - equal to 0.5 percent for humans - resulted in the destruction of testicular cells and sperm. One study the German researchers looked at found that just 0.3 percent prolonged CO2 exposure to both pregnant rats and young mice led to brain damage, heightened anxiety and poorer memory.
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