EURODO (15pcs) Activated Carbon PM2.5 Filters 5 Layers Paper for Cotton Cover of Mouth Face - Protective Replaceable Anti Haze for Outdoor (15pcs)

Five-layer ProtectionThe 1st layer is made of spunbond cloth which filters micron-level dust. The 2nd layer filters industrial pollutants, automobile exhaust, passive smoking, and pollen allergens. The 3rd layer is made of active carbon cloth wich filters micron-level dust. The 4th layer ensures the density of the filter.The 5th layer of spunbond fabric filters out all kinds of harmful substanc...