Chemicals emitted from building materials can be a potential source of health problems if they are not properly addressed. For example, cabinets, counter tops, and furniture are often made from pressed wood products such as particleboard or medium-density fiberboard (MDF), which are typically manufactured with formaldehyde-based adhesives. This formaldehyde can offgas into your home for years. Unfortunately for your family's health, formaldehyde is a known human carcinogen according to the World Health Organization; it can also cause watery eyes, headaches, fatigue, and nausea. Paint and floor finishes can also contain formaldehyde and other chemicals that are not healthy to breathe, especially for small children. Green building encourages use of products and materials that reduce or eliminate these sources of indoor pollution. These include a wide range of products such as low-VOC paint, solvent-free adhesives, and water-based wood finishes that not only eliminate many of the suspected and known carcinogens, but often perform better than traditional product. Finally, ventilation is key to keeping and maintaining indoor air quality for healthier living. Adequate ventilation is especially important in green building as it can reduce the potential for mold growth and buildup of allergens and other particulates.