The ideal is to have as high a filtration efficiency as possible. N95 respirators perform between 95% — 100%.
In our tests, surgical masks (made of melt blown fabric) perform way better than any cloth mask. Why? Check out our blog post here.
This is measured by “initial resistance” in the test set-up. Anything above 135Pa is very difficult to breathe through when properly sealed, and it is not recommended wearing for a long period of time.
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Outdoor Research: https://www.outdoorresearch.com/us/face-mask-kit-283298