▎ 摘　　要

NOVELTY - Multi-layered masks (100) comprises five layers characterized in that first and last layers are made of cotton textile layers (110), natural fiber layers (120) to filter and functionalized polymer of nanofibers layer (130) to filter the virus of aerosols, and the mask is deployed with smart valve (160) on outer layer of the mask, further characterized in that, the natural fiber layers and forming a second and the fourth layer and functionalized polymer of nanofibers layer forming the third layer, where the second layer and fourth layer are made of natural cellulose and citosan layer, the third layer 130 is made of functionalized nanofiber using PVDF TrFE (Polyvinylidene fluoride-trifluoroethylene) as filtrate and the third layer functions as a hydrophobic layers preventing the aerosols to enter the further layers is nanofibers of PVDF-TrFE (with nano dopants), where, the mask provides a smart valve used for exhalation. USE - The multi-layered mask is useful for: protecting against the aerosol transmission of COVID-19; and preventing virus, bacteria, dust, toxic chemicals and infectious particles entering into digestiveand respiratory systems of human body. ADVANTAGE - The multi-layered mask: designed to cover the nose and the mouth; serves aspersonal protective equipment in areas at risk of virus exposure may help slow down the spread of SARS-nCoV-2; has efficiency greater than 95%; and is comfortable for long-term use in daily life. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for method, system and apparatus providing at least one features as described in the specification. DESCRIPTION OF DRAWING(S) - The figure shows schematic representation of the multi-layered mask. Multi-layered mask (100) Cotton textile layer (110) Natural fiber layer (120) Nanofibers layer (130) Smart valve (160)