Set of 12 PM2.5 Activated Carbon Filters

Made of quality activated carbon, non-woven & melt-blown filter cloth, can effectively filter out exhaust, pollen, smoke, dust, chemicals, particles & fumes. 5 LAYER PROTECTION: 1st layer of spunbond cloth filters micron-level dust. 2nd layer filters industrial pollutants, automobile exhaust, passive smoking. 3rd layer of active carbon cloth filters micron-level dust. 4th layer offers filter density for smaller material. 5th layer of spunbond cloth filters out all kinds of harmful substances.