The photo catalytic air purifier is based on photo catalytic oxidation (pco), an emerging air purifier technology that converts fine particles and toxic gasses into safer compounds. Pco is fda approved for reducing bacteria in poultry and pork processing, and is used to cleanse pesticides from fruits and vegetables. A photo catalytic air cleaner uses broad spectrum ultraviolet light, which reacts with a thin-film titanium dioxide-based chemical catalyst, in the presence of water, to create hydroxyl radicals and super-oxide ions which oxidize volatile organic compounds (vocs), and eliminate microorganisms adsorbed on the catalyst surface. A high-intensity broad spectrum ultraviolet lamp, with uvc (254 nm) germicidal light wavelengths included, is the first part of photo catalytic air purification technology. Ultraviolet light can reduce microbial populations in our air. A wider set of ultraviolet wavelengths below 385nm are employed for catalyst activation. Although uv light alone will degrade toxic organic compounds, reaction rates are much faster with photo catalytic assistance. A catalyst is a substance that can speed up a chemical reaction without itself being used up. The catalyst material in the photo catalytic purifier is titanium dioxide, tio2, which is applied as a thin film on aluminum or ceramic substrate. Titanium dioxide is a relatively inexpensive pigment and is used to add whiteness to products such as paints and coatings, plastics, paper, inks, fibers, food, toothpaste and cosmetics.