According to health experts, it is now very important to buy three-layered masks instead of one or two layered masks. Three-layered masks will stop many droplets of the virus from coming to you.

“While it is expected that large solid particles in the 500-600-micron range should be stopped by a single-layer mask with average pore size of 30 micron, we are showing that this is not the case for liquid droplets,” said Saha.
“If these larger respiratory droplets have enough velocity, which happens for coughs or sneezes, when they land on a single-layer of this material it gets dispersed and squeezed through the smaller pores in the mask,” he added.
For the study, published in the journal Science Advances, the team used a droplet generator and a high-speed time-lapse camera.

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