Photocatalytic Oxidation (PCO) is a very powerful air purification technology and has the ability to de­stroy particles as small as 0.001 microns. Photocatalytic oxidation destroys microbes, vola­tile organic compounds (VOCs), and chemically active compounds (CACs). The Photocatalytic Oxidation process combines UVC irradiation with a substance (catalyst) titanium dioxide (TiO2) which results in a reaction that changes malignant contaminants into wa­ter, carbon dioxide and detritus.