Keywords: Face masks, Carbon dioxide, SARS-CoV-2, COVID-19 pandemic, COVID-19 However, concentrations in the detected range can cause undesirable symptoms, such as fatigue, headache, and loss of concentration. According to the literature, these concentrations have no toxicological effect. No differences were observed among the three types of face masks tested. Walking at a speed of 5 km h –1, which corresponds to medium activity with breathing through the mouth, resulted in an average carbon dioxide concentration of 2875 ppm. A small increase could be observed when walking at a speed of 3 km h –1 (leisurely walking pace). Doing office work and standing still on the treadmill each resulted in carbon dioxide concentrations of around 2200 ppm. The concentrations of carbon dioxide while not wearing a face mask varied from 500–900 ppm. Detected carbon dioxide concentrations ranged from 2150 ± 192 to 2875 ± 323 ppm. Measurements were made using a modified indoor air quality meter equipped with a nondispersive infrared (NDIR) CO 2 sensor. For the surgical mask, the concentration was determined under different conditions (office work, slow walking, and fast walking). In this study, the carbon dioxide concentration in the breathing zone was measured while wearing a surgical mask, a KN95 and a cloth mask.
Lately, concern was expressed about the possibility that carbon dioxide could build up in the mask over time, causing medical issues related to the respiratory system. The use of face masks is among the measures taken to prevent person-to-person transmission of the virus (SARS-CoV-2) responsible for the coronavirus disease (COVID-19). The measured concentrations have no toxicological effect when inhaled.
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