The best air-purifiers also capture & eliminate VOC. Some people are sensitive to multiple chemicals (MCS). Numerous household sources emit VOC such as: paint strippers, nail-polish removers, cleaning chemicals, adhesives, or home furnishings and upholstery treated with formaldehyde, are capable of emitting VOC. Even PVC-housed home appliances/equipment and photocopiers can emit VOC. Some harmful VOC emit a deceptive pleasant smell. A Chemical VOC air-purifier uses an activated carbon filter for capturing gases and odors, and VOC particles which are too minute for HEPA filters to absorb. If you want extra protection from viruses, a model with UV filtration or titanium dioxide will eliminate (kill) all viruses with a single passing through this air-purifier. Some popular Chemical VOC air-purifiers are Austin Air Healthmate (Superblend), IQAir’s HealthPro Plus and Alen A350 Air purifier.