Water-based latex paints produce fewer solvent fumes than the older solvent-based paints, but they may still increase the risk of allergic disease in young children, according to Dr. Hyonok Choi and collaborators. Choi, at the Harvard School of Public Health in Boston, Massachusetts, studied the relationship between common household chemicals and allergy in preschool children along with researchers in Sweden, Norway, and China.
An enormous variety of chemicals has been introduced into our environment since the end of World War II, Choi noted. Volatile organic compounds and semi-volatile organic compounds can persist for years in indoor atmospheres. Two medical literature reviews have linked allergy and asthma symptoms to residential chemicals from painting, particle board, plastic materials, home cleaning agents, air fresheners, and pesticides.
Choi and coauthors identified eight classes of volatile organic compounds for their study: aldehydes, alkanes, aromatic hydrocarbons, dimethylalkanes, propylene gylcol and glycol ethers (PGEs), methlyalkanes, organic acids, and texanols. They performed a case-control study of 400 children in Varmland, Sweden, to see whether children with allergies had higher exposure to these chemicals, compared to children with similar demographics but without allergy symptoms. Air and dust samples from the children's bedrooms were collected by professional building examiners who did not know which homes were associated with allergies.
The glycol ethers were the only class of chemicals to show a significant correlation with allergies. These are common solvents found in products as diverse as water-based paint, varnishes, cleaning fluids, pharmaceuticals, pesticides, cosmetics, and processed foods. In Choi's study, a history of repainting at least one room of the house shortly before or after the birth of the child was associated with a 63 percent increase in glycol ether chemicals in the air samples.
Glycol ethers are also among the chemicals identified as undesirable for women contemplating pregnancy.