![\\"logo\\"](\\"/img/logo-dpa-factchecking.svg\\"/) * WhatsApp service * About Us ![\\"IFCN](\\"/img/ifcn-certificate.png\\"/) ![\\"EFCSN](\\"/img/efcsn- certificate.png\\"/) # No CO2 poisoning through protective masks against Corona October 13, 2020, 7:15 p.m. (CEST) The claim is circulating on the Internet that wearing protective masks leads to... There is a risk of carbon dioxide poisoning if the corona pandemic is contained. As evidence is an occupational safety poster (archived here) from a gas production company widespread, warning about the dangers of CO2 in closed rooms becomes. Values ​​have already been measured under an everyday mask that According to the company, it can be dangerous, according to the text. ASSESSMENT: The reference to the risk of CO2 poisoning in closed rooms is misleading. Because an everyday mask is not one such space. Rather, the air under a mouth and nose cover only makes things happen a fraction of the air you breathe in. FACTS: The article on the Internet discusses the risk of CO2 poisoning Closed spaces are related to wearing everyday masks. The but cannot be compared. Because such corona protective masks close not airtight. You also breathe in significantly more air than just the air under your mouth and nose. Protection. A healthy adult has a tidal volume at rest that is... ranging from just under 500 milliliters to just under a liter, explains Michael Achenbach, doctor and spokesman for the professional association for children and children Youth doctors (BVKJ). Under load this can easily be several liters increaseable. The air under the mask, on the other hand, is significantly less than 50 milliliters. In addition, this is not just a dead space volume. This will make it Amount of air that is not exchanged. Because the air underneath An everyday mask mixes with the air from outside. It is true that values ​​of ten percent or more CO2 in the ambient air can be fatal, as stated in the article and in the warnings of the Gas producer company is called. And videos are being distributed on the Internet in which... CO2 measuring devices produce excessive values ​​when analyzing the air under the mask show. However, such measurements are misleading because the devices used are often not suitable The purpose is to analyze the air we breathe, like Professor Uwe Pliquett from the Institute for Bioprocess and Analytical Measurement Technology in Heilbad Heiligenstadt explained. This can be the case for CO2 measuring devices, among other things be difficult because high and low values ​​occur quickly when exhaling and inhaling change. Even if you know of increased CO2 levels under the mask due to the remaining exhaled air goes out, this is put into perspective when you look at the whole thing Breathing air, explains Pliquett. “Then is the average CO2 value of the inhaled air at around 0.1 to 0.2 percent, depending on how much CO2 is in the ambient air is." This corresponds to the values ​​that, according to the Federal Environment Agency, are still below are at a critical level. According to experts, wearing a mouth and nose cover is healthy Generally harmless to humans. This is how the German Respiratory League goes from that with a simple surgical mouth guard or one yourself The mouth and nose covering produced causes an increase in carbon dioxide is unlikely - because these masks are not completely tight. This could only occur in patients with chronic respiratory failure Carbon dioxide content and the “work of breathing” increase, “so that the coverage of Mouth and nose as unpleasant or threatening and subjectively as shortness of breath is felt”. Also with professional masks (FFP2, FFP3). Threatening increases in CO2 levels in the blood due to masks “unlikely”. \--- Left: Post on Facebook: (archived: Federal Environment Agency on recommended CO2 limit values: (archived: Communication from the respiratory league: zu-covid-19/maskenpflicht.html (archived: \--- Contact the dpa fact check team: faktencheck@dpa.com powered by dpa-newslab | Imprint | Privacy | About:
The claim is circulating on the Internet that there is a risk of carbon dioxide poisoning when wearing protective masks to contain the corona pandemic As evidence an occupational safety poster archived here from a gas production company is being distributed which warns about the dangers of CO2 in closed rooms The text states that values have already been measured under an everyday mask that according to the company can be dangerous