Here is an easy test to see if your mask is restricting oxygen. Buy a Pulse Oximeter from any number of places for about $20. Test yourself with it before and after wearing your mask for awhile. My baseline on the meter is 97%. With one of the paper masks I tried, it dropped to 89% in less than 30 minutes. When I am forced to wear a mask due to store policy, I use one that is made out of piece of mulsin that is just a little bit away from being cheese cloth. I was going to use actual cheese cloth but I use that to make cheese with.
I was going to use actual cheese cloth but I use that to make cheese with.
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Just use the cheese - just as effective.