According to the test we’ve done in our Beijing Lab. A single layer of kitchen paper captured just 23% particles. Adding an extra layer only increased particle capture to 33%. For larger 2.5 micron particles, paper towel performed better. The single layer of kitchen paper captured 52% of these larger particles.
Click here to read the full test and learn more about the details: https://smartairfilters.com/en/blog/paper-towel-effective-against-viruses-diy-mask/