Face masks cause carbon dioxide poisoning

the verdict

REFUTED

the evidence says no

Recorded sources

0 sources for · 4 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

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.

How claims like this are judged

Judged against fact-checker rulings and reference works: claims of this kind are settled by the fact-checking record, not journal abstracts.

Evidence against · 4

BBC: Coronavirus: 'Deadly masks' claims debunked

Recorded source metadata

BBC: Coronavirus: 'Deadly masks' claims debunked. BBC. https://www.bbc.co.uk/news/53108405

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."

Source citation format

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More against · 3

USA Today: Fact check: Wearing face mask will not cause hypoxia or hypercapnia

Recorded source metadata

USA Today: Fact check: Wearing face mask will not cause hypoxia or hypercapnia. USA Today. https://www.usatoday.com/story/news/factcheck/2020/05/30/fact-check-wearing-face-mask-not-cause-hypoxia-hypercapnia/5260106002/

Fact-checker ruling: Partly false

Source citation format

BOOM Fact Check: Does Wearing Mask Increase Risk Of CO2 Toxicity? Experts Say ...

Recorded source metadata

BOOM Fact Check: Does Wearing Mask Increase Risk Of CO2 Toxicity? Experts Say .... BOOM Fact Check. https://www.boomlive.in/world/does-wearing-mask-increase-risk-of-co2-toxicity-experts-say-otherwise-9006

Fact-checker ruling: False

Source citation format

pubmed.ncbi.nlm.nih.gov: Carbon dioxide increases with face masks but remains below short-term ...

Recorded source metadata

pubmed.ncbi.nlm.nih.gov: Carbon dioxide increases with face masks but remains below short-term .... pubmed.ncbi.nlm.nih.gov. https://pubmed.ncbi.nlm.nih.gov/33858372/

Study shows CO2 increases remain below short-term safety limits.

Source citation format

The paper trail · every fact has a biography

first checked31 Jul 2026

judged → REFUTED · 031 Jul 2026

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