Multiple fact-checks and scientific studies have debunked the claim that face masks cause carbon dioxide poisoning, finding that while CO2 levels can rise slightly behind masks, they remain well below safety limits and do not cause toxicity.
Evidence against · 4
BBC: Coronavirus: 'Deadly masks' claims debunked
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Fact-checker ruling: No evidence of this. The World Health Organization says: "The prolonged use of medical masks when properly worn, does not cause CO2 intoxication nor oxygen deficiency."
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More against · 3
USA Today: Fact check: Wearing face mask will not cause hypoxia or hypercapnia
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Fact-checker ruling: Partly false
BOOM Fact Check: Does Wearing Mask Increase Risk Of CO2 Toxicity? Experts Say ...
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Fact-checker ruling: False
pubmed.ncbi.nlm.nih.gov: Carbon dioxide increases with face masks but remains below short-term ...
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Study shows CO2 increases remain below short-term safety limits.