Listening to the news. They are showing "how to tell if your mask is counterfeit." Arrow to where there should be this number and that number, and so on.
Which means the counterfeiters will put some numbers here and some there and so on. Then none of us will be able to tell which are counterfeit.
Separately but related: how much difference is there between a standard kn95 mask and a well researched, well made, fitted to an individual cloth mask? I have some kn95 from a couple of different shipments. One kind fits perfectly. The others don't.
Now that they are starting to talk about cloth masks not being good enough, I think it will be a matter of time until 95s and kn95s will be specified in the mandates with no allowance for more effective and more comfortable cloth masks.
How do they STILL not know these things???
"...Further research is needed to expand the evidence base for the protective effect of face coverings and, in particular, to identify the combinations of materials that maximize both their blocking and filtering effectiveness,..." quote from ASTM standards referenced by the updated CDC guidelines as of the January 14, 2022 update.
Along with, "
"There are currently no established methods for measuring outward leakage from a barrier face covering, medical mask, or respirator. Nothing in this standard addresses or implies a quantitative assessment of outward leakage and no claims can be made about the degree to which a barrier face covering reduces emission of human-generated particles."
And
"This testing is not likely to be representative of outward leakage from the barrier face covering and should not be claimed to represent the amount of source control offered by the face covering."
Leakage is around the edges of the masks or through seams. I am not sure if it includes other things that reduce the effectiveness - of which they named several including touching the mask, age of the mask, after laundering it many times.
That doesn't mean masks don't make some difference; they may even make a LOT of difference in at least some situations.
If masks are as important as they are portrayed.... how do we STILL not know