Smog, household cleaners, cigarette smoke and pollution can all contribute to unhealthy levels of chemicals and gases in your air. Volatile Organic Compounds (VOCs) are a frequent irritant and can come from such sources as fresh paint, new carpets, or new furniture. All of these purifiers have exceptionally high levels of carbon and are often treated to do the best job of removing irritating or potentially hazardous levels of gases and chemicals from your air, whether you suffer from chemical sensitivity or just want cleaner air for your family and yourself.