5 ms·
Which science do you mean? Found a redacted study from Germany and doctors saying there's no effect on blood O2 or CO2 levels https://uihc.org/health-topics/do-
by andreyf 5y ago
Which science do you mean? Found a redacted study from Germany and doctors saying there's no effect on blood O2 or CO2 levels https://uihc.org/health-topics/do-face-masks-make-you-retain-carbon-dioxide https://uihc.org/health-topics/do-face-masks-make-you-retain...