1 5 пыль загрязнение воздуха очиститель накладки рм2,5 активированный уголь маска для велоспорт велосипед маски пыли pm2.5 активировать угол

1 5 dust pollution air cleaner pads pm2.5 activated carbon mask for cycling bike bicycle 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.