... filters, activated carbon, negative ion, photocatalyst, plasma 1) super-activated carbon filter HEPA air filter high concentration of various particles ... stress and impatience effect.. 3) Nano Photocatalyst purification of air, the use of advanced Tio2 photocatalyst, the car ... between the bacteria and cross infection. 4) ULPA air filters remove dust and static electricity, clean automobile exhaust ...