How common are indoor air quality-related problems?
A committee of the World Health Organization estimates that as many as 30 percent of new or remodeled buildings may have unusually high rates of sick building complaints. While this is often temporary, some buildings have long-term problems which linger, even after corrective action. The National Institute for Occupational Safety and Health (NIOSH) reports that poor ventilation is an important contributing factor in many sick building cases.
