Fact-checked by: Science Feedback

2020/05/03 | United States

FALSE: Wearing face masks can cause carbon dioxide toxicity; can weaken immune system.

Explanation: Face masks help to limit contact with infectious droplets which carry pathogens. However, the material used for face masks are still porous enough to allow gas molecules, such as carbon dioxide and oxygen, to pass through, and do not significantly impair gas exchange to the point of causing hypercapnia. No scientific evidence supports the claim that the use of face masks weakens the immune system.

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This false claim originated from: Facebook users, Facebook

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