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https://www.researchgate.net/publication/258525804_Testing_the_Efficacy_of_Homemade_Masks_Would_They_Protect_in_an_Influenza_Pandemic

effectiveness-of-kitchen-paper-at-capturing-0.3-micron-virus-sized-particles.jpg
https://smartairfilters.com/en/blog/paper-towel-effective-against-viruses-diy-mask/


Effectiveness-of-DIY-homemade-masks-vs-surgical-masks-at-filtering-coronavirus.jpg
https://smartairfilters.com/en/blog/diy-homemade-mask-protect-virus-coronavirus/

Bottom line on paper towel for DIY masks
Paper towel performed significantly worse than other DIY mask materials tested by Cambridge researchers. However, if there is no other choice available for materials for your DIY mask, paper towel still scored better than nothing.