>There are no studies that I can find showing woven fibre or paper mask effectiveness Oh, well you're in luck. I have just the thing for you: https://smartair

>There are no studies that I can find showing woven fibre or paper mask effectiveness Oh, well you're in luck. I have just the thing for you: https://smartairfilters.com/en/blog/best-materials-make-diy-face-mask-virus/ https://smartairfilters.com/en/blog/best-materials-make-diy-... This image is the quick, all-encompassing money-shot: https://smartairfilters.com/wordpress/wp-content/uploads/2020/03/Mask-Materials-Effectiveness-1-Micron-EN-768x558.jpg https://smartairfilters.com/wordpress/wp-content/uploads/202... You can make the argument that homemade masks won't reach those levels of effectiveness because of a lack of a strong seal around the airways. And there have been no real-world case studies of cotton masks protecting people from getting sick. But there are plenty of arguments to be made that support the idea that if 100% of the population wore a cotton shirt around their face, then the pandemic would be strongly mitigated.