Add one with your face mask, these are made of activated carbon and non woven melt blown filter cloth, four-layer filter system effectively keep away from PM 2.5 and a range of airborne contaminants. Good for up to 70 hours of use.
- First layer of spunbond cloth filters micron-level dust;
- Second layer filters industrial pollutants, automobile exhaust, second-hand smoke, and pollen allergens.
- Third layer of activated carbon cloth filters micron-level dust;
- Fourth layer offers filter density for smaller material.