http://www.arb.ca.gov/research/indoor/formaldgl08-04.pdf
"SOME COMMON SOURCES OF FORMALDEHYDE INDOORS
-Pressed wood products: particleboard, plywood, medium-density fiberboard (MDF); often used in cabinetry, and wall and floor materials
-Consumer Products: fingernail hardeners, nail polish, wallpaper, some other paper goods, paint, coatings; often a preservative in these and other products
-Coatings for Some Cabinet and Furniture Products: acid-catalyzed ureaformaldehyde type finishes
-Permanent Press Fabrics: clothing, linens, draperies
-Combustion Appliances: wood stoves, gas appliances, kerosene stoves
-Tobacco products: cigarettes, cigars"