A study on face masks has identified a combination of two fabrics as possibly the best: either cotton plus natural silk, or cotton plus chiffon. If the fit is good, such homemade masks can effectively keep out aerosol particles.
About:
An aerosol is a suspension of particles or droplets in the air. The virus that causes COVID-19 is thought to spread mainly through respiratory droplets, particularly when an infected person coughs or sneezes.
The World Health Organization (WHO) defines two size ranges for droplets through which respiratory infections can be transmitted — 5-10 microns in diameter (respiratory droplets) and less than 5 microns in diameter (droplet nuclei). One micron is a millionth part of a metre.
It is respiratory droplets (the larger size range) that are thought to be the primary route of COVID-19 infection. Airborne transmission, which is through droplet nuclei (the smaller size range), was not reported in a large study in China, the WHO notes.
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