Agreed, the manufacturer will tell you the level of protection each mask provides.
Mask’s do not provide protection against a virus.
Some Surgeons wear masks to stop incoming splatter.
Some Surgeons do not wear masks. They cannot risk their glasses fogging up during surgery.
This notion “my wearing a mask is protecting you” is pure unalloyed nonsense.
Properly fitted N95 masks do. But virus is a red herring anyway, we are talking about droplets.
Some Surgeons wear masks to stop incoming splatter.
Red herring, who cares.
This notion “my wearing a mask is protecting you” is pure unalloyed nonsense.
Yes. And outgoing droplets?