Masks are dangerous.

THE HUMAN NOSE: “Particles larger than 3μm have a maximum deposition in the anterior part of the nose (nasal valve). Particles smaller than 3μm & larger than 0.5μm are filtered by the nasal mucosa and transported by cilia propulsion to the nasopharynx.”

THE N95 MASK: The filtration material itself of N95’s average pore size ~0.3−0.5 μm [larger average pore size is just like the mucosa filter of the NOSE] does not block finer aerosol laden with virions penetration, not to mention surgical masks. For example, see Balazy et al. (2006).

https://pubmed.ncbi.nlm.nih.gov/9432080/

CONCLUSION: THE HUMAN NOSE is as good a filter as an N95 mask given the N95 mask has many pores which are equal in size to the filtration capacity of the nose of 0.5μm.

https://pubmed.ncbi.nlm.nih.gov/9432080/

HOWEVER breathing mouth to mask NEBULIZES aerosols into smaller particles making them potentially more infectious to other people’s lung alveoli:

https://t.me/robinmg/10466