Simple rule of thumb - if you can breathe in your mask, nebulized vapor is escaping; which is where the majority of all viral diseases spread from.

I've been saying the same. People will see when weather is colder to see the water vapor in our breath that no masks will stop our breath which carries the viruses. The only mask that will possibly stop such will be a double respirator. One with filters that can stop viruses in the intake of our air as well as the expelling of our breath.... But even most of these types of respirators will need advanced filters designed to stop particles the size of viruses, not a simple thing to do. All this mask stuff is orchestrated theatre, only to mess with the public's mind and to establish more mindless fear. Humans are confronted by germs, bacteria and viruses everyday. We have active and evolving immune systems. God has given us the ability to think and invent other medicines to help us fight off disease and germs. No, our immune system do not guarantee all of us universal protection and immortality... Life is still life. But we are to be living life and not in orchestrated fear.