A UK doctor, wanting to disprove all of the false information showing up on the Internet about masks hindering oxygen levels, decided to debunk these claims by running 35 km on a humid summer day. In addition to the mask, he wore a pulse oximeter during the run to measure his oxygen levels, which were 98% and 99% throughout; anything above 95% is considered normal. While he found the mask uncomfortable to wear while running, especially after it became sweaty, he wanted to "assure others that wea
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