I have therefore been upset at the misinformation going out around oxygen levels and masks, as well as confused messaging on when to wear them (indoors! )”Dr Lawton ran to and from the hospital while wearing both a face mask and an oxygen sats monitor. During the run, the monitor showed the doctor to have 98% oxygen levels thoughout, suggesting that face masks do not affect the amount of oxygen you can breathe. He said: “Final verdict was 22.6 miles in a mask (8 miles, then just over 14), breathing enough oxygen for about 10 calm people all the way. The World Health Organisation has confirmed that wearing a face mask does not decrease the amount of oxygen you can take in, or cause carbon dioxide intoxication.

Source: Daily Mirror July 23, 2020 13:14 UTC