| From the article linked: > Bacteria ~ 3μm while viruses ~0.025μm in diameter However, SARS-CoV-2 is estimated to be around 0.1um, per https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7224694/#:~:tex.... > SARS-CoV-2 is an enveloped virus ≈0.1 μm in diameter Making the 0.1μm measure more relevant. Ultimately, it's up to your judgement whether to determine these filters are likely to be at least as useful as alternatives, bearing in mind that a poor seal/fit (which you may get with other masks) reduces effective filtration by quite a bit. Apart from the aforementioned testing of our filter material, and the third-party fit tests (https://narwallmask.com/#h:testing), the CDC's National Personal Protective Technology Laboratory, under NIOSH, is currently assessing the mask but has yet to release results. Another option you could pursue is a half-face elastomeric respirator with a surgical mask securely taped over the exhale valve, coupled with tight-fitting goggles. It may be less convenient and may or may not achieve the aesthetic properties you seek, but those masks have been around long enough to be evaluated by government bodies for their ability to protect the wearer (though, not the public). |