dust proof анти haze одноразовые внутренние рм2,5 колодки для mouth маска protect square айва маска рм2,5 колодки для рта маски

pm2.5 for adult and kids anti haze replaceable kn95 n95 mouth mask pad 5 layers non-woven activated carbon face features: 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.