5layers mat activated protective pad original insert anti haze 5 layer pm2.5 activate car sngo

pm2.5 activated carbon pad 5layers insert protective mat anti haze mouth replaceable s health items gga3293 g.1.the first layer: high efficient filter cloth filter the dust of micron.2.the second layer: meltblown cloth to filter industrial pollutants, automobile exhaust, second-hand smoke pollen allergies.3.the third layer: high efficient filter cloth filter benzene and a smaller function of filtering dust microns.4.the fourth layer: activated carbon cloth filter density, sma.