Westinghouse has made it safer for us to breathe in the air through its innovative NCCO air purification technology that cleans the air with active oxygen. The NCCO 1701 is a full size medical-grade true HEPA air purifier that can effectively clear the air of up to 99.99% of harmful particulates, bacteria, viruses, and odors. It decomposes toxic air and turns it into harmless carbon dioxide and water molecules.