The NCCO system, removes pollutants such as allergens, viruses, bacteria, TVOC’s (total volatile organic compounds,) smoke and odors without releasing toxins back into the environment. NCCO technology eliminates what HEPA air purifiers can’t. Westinghouse air purifiers don’t just trap PM25 particulate like; pollen, allergens, germs and dust, it eliminates them when conventional air purifiers, with HEPA filtration alone or active charcoal, only capture these harmful pollutants.