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The Center for Disease Control has issued a new coronavirus order requiring DOUBLE masks to be worn for all forms of public transportation in the United States.

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The Center for Disease Control has issued a new coronavirus order requiring DOUBLE masks to be worn for all forms of public transportation in the United States. more ...

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[–] 0 pt

This is all fascinating. So, with rebreathers, they scrub the CO2. That tells me that the science has been long proven how important it is to keep CO2 out of the inspiration. Since we don't have rebreathers on masks, what's your take on that assessment? Your insight is going to be golden since you have the experience

[–] 0 pt

I'd like to not get caught up with mechanisms scrubbing CO2. My point was always that breathing your own exhale is not only dangerous, but harmful. The deleterious effects of CO2 is readily evident in the short term, but also in the long term. I'm inclined to believe that water pressure of 1 atm (~30 ft.) and more, as exemplified in scuba diving, produces deadly and obvious deleterious effects. Living above sea level, these deleterious effects are spread out across a longer and wider range of health problems, in which the harmful effect can be immediate or appears in the longer term. For example, brain damage due to CO2 is irreversible and cancer could be triggered years later.

I am mentioning only one aspect of danger in breathing your own exhale. The lungs, trachea, nasal passage and sinuses all act as the first line of defense against microbes. They all act as a filter and have their own mechanisms to rid the body of them. In our exhale itself, the result of these functioning defense mechanisms is realized in every breath we take, in which billions and billions of pathogens and particulates are ejected. A face mask completely hinders this remarkable defense system.

Virologists tell us that entry of viruses in our bodies commonly occur through the eye ducts. As a result, we are taught to not to rub our eyes with our fingers. A face mask will restrict exhale and will escape through the gaps at the outer boundaries of the face mask. It turns out that very little exhale travels through the fabric of the face mask. The majority will travel the path of least resistance and escape through the gaps at the edge of the mask. This is actually referred to as 'jet streams'. Two of these large jet streams are upward and escape directly toward the eyes. Have you ever worn safety glasses with a face mask only to realize very quickly your safety glasses have steamed up? One's exhale containing billions of ejected pathogens is directed straight at the eyes when wearing a face mask. Nature has provided us a very efficient design. There's a very good reason why our noses are pointed downward and away from our eyes. There's a very good reason why our exhale should never be restricted.