5 Layers PM 2.5 Carbon Mask Filters For AdultTKLC10 5 layered protection of non woven fabric with high efficacy against airborne and particulate matters. The activated carbon filter is very effective in trapping airborne particulate matter. When the person wearing a cloth face mask with a PM2. 5 filter comes in contact with any pollutant, the active layer of carbon prevents it. The particles stick to the adhesive layer of the filter.