DUBLIN, Ireland -- A doctor based in Dublin, Ireland, has debunked the idea that a face mask lowers oxygen levels. In fact, he's shown that even wearing several has no effect.
This video shows Maitiu O Tuathail putting six masks on his face while recording his blood oxygen saturation levels.
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As he puts on mask after mask, the meter shows a steady, and healthy, 98-99 percent.
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O Tuathail posted the video on Twitter to address the misconception that face masks negatively affect oxygen levels.
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He said he was being asked this regularly by patients, who were citing misinformation they had found on social media.
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