What works best:
The face masks most effective in filtering out the novel coronavirus are made of high thread count cotton flannel with four layers of fabric. Lab tests have shown that fabric with 600 threads per inch filtered out 79 percent of the virus particles smaller than 0.3 microns.. Particles of SARS-CoV2 (coronavirus’s new name) are 0.125 microns across.
The lab tests also showed that masks made with a layer of high thread count .cotton fabric plus a layer of flannel or two layers of real silk or chiffon filter out 94 to 97 percent of particles smaller than 0.3 microns in diameter. The high thread count cotton blocks out tiny particles, but flannel, silk, and chiffon cause tiny virus particles to stick to them as if to magnets.
Shop for a mask rated N95. Be skeptical about masks made in China. They are rated KN95. To find FDA approved Chinese-made masks, go to lbit.ly/225BMOw..
Goggles to protect your eyes from airborne virus particles are a good idea, too. With a really effective face mask, goggles, and staying six feet away from anybody else, even outdoors, you should remain very healthy.
What does not work:
A mask with a single layer of low thread count such as a bandana does not keep virus particles out. Also, a mask made from a vacuum cleaner bag, though it would keep the virus out of your body, would contain chemicals and micro glass particles that would damage your lungs if inhaled.