Face masks are the new normal for many ... the body or a region of the body is deprived of adequate oxygen supply at the tissue level. "Breathing over and over exhaled air turns into carbon ...

Brown-Beresford K, Currie J, Thiruvenkatarajan V: The application of a surgical face mask over different oxygen delivery devices; a crossover study of measured end-tidal oxygen concentrations.

One example that the team explains is how the mask can potentially monitor levels of nitrite in a person ... which also propelled the face mask industry forward. Technology pundits were eager ...