Scientists have actually made people wear N95 masks and measured their blood oxygen.
Data shows even during moderate exercise, randomized studies have found no evidence that N95 masks decrease oxygen levels in people’s bodies.
Wearing N95 masks during moderate exercise does not starve us of oxygen, but it does modestly increase blood CO2.
Please notice that one study found N95 masks are safe for pregnant women does not mean they’re safe for everyone. If you have a pre-existing cardiopulmonary condition such as COPD or asthma, you should talk to your doctor for the best protection option.
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