A doctor has run 22 miles to work and back wearing a mask to help stop the spread of misinformation and conspiracy theories around face coverings and to raise funds for charity. He recorded that oxygen levels never fell below 98% of what it would usually be.

submitted by rdh2121 from newsweek.com

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[–]Earl_Harbinger 4 insightful - 1 fun4 insightful - 0 fun5 insightful - 1 fun -  (0 children)

I thought the claim was generally that carbon dioxide levels increased, not that oxygen levels fell too low.