Benzene is present in inks, oils, paints, plastics, and rubber. It is also used in the manufacturing of detergents, dyes, and some pharmaceuticals. In addition to irritation of the eyes and skin, chronic exposure to even low levels of benzene causes headaches, loss of appetite, drowsiness, psychological disturbances, and disease of the blood system, including anemia. Trichloroethylene is used by the dry cleaning industry and in printing inks, paints, varnishes, and adhesives. This chemical is considered to be a potent liver carcinogen.
Carbon monoxide is found in cigarette smoke and is produced by the incomplete combustion of fuel.
Exposure to low levels can cause drowsiness and headaches. Researchers have identified several varieties of houseplants that excel in removing these chemical pollutants from the air. The most effective in removing formaldehyde were philodendron, spider plant, and golden pothos. The peace lily and the chrysanthemum removed the highest percentage of trichoroethylene. Since all plants utilize carbon in the process of producing new growth, all these varieties are effective in removing low levels of carbon monoxide.