christopher..
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I cannot fimd the black fabric masks with vents.
Breathing in carbon dioxide is not great.
But Dr Nina Shapiro, professor at UCLA School of Medicine, told Euronews that face coverings "do not have any impact on CO2 levels in regular individuals".
"[N95 masks] have been used for fire/smoke protection, and for workers in construction for many years".
"They are extremely uncomfortable and pretty harsh on the skin, but the notion that thousands of workers are becoming hypoxic and/or hypercapnic is unfounded."
Dr Shapiro explains that this is because respirator particles of carbon dioxide are so small that they will pass through mask material, unlike larger particles of coronavirus.
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