Regarding the original question , we have chinese face masks made of 3-ply material. I am not sure of the quality, and to add to my confusion, I found two types in the market which seem to be identical but one type is 3 times more expensive than the other. I bought both types. One to use as general purpose low-risk areas, the other for higher risk areas (more crowded ..etc.)

I will not be surprised if they are the same.
Drug stores sell them at higher prices than discount stores.