One of the challenges is communicating context. 20% to 80% of filters is not good enough in a healthcare setting since a provider may be in a room absolutely f

One of the challenges is communicating context. 20% to 80% of filters is not good enough in a healthcare setting since a provider may be in a room absolutely filled with virus particles. In a public setting, 20% to 80% might be enough to limit incidental viral loads enough to prevent infection. It's hard to define the effectiveness across a wide variety of settings a cloth mask might be used in.