Quality The Environmental Protection Agency says indoor air quality problems are one of the largest remaining health risks in the United States. The effects range from headaches and allergies to cancer and heart disease.
More serious cases lead to increased absenteeism and poor morale.
Usually the most effective way to improve indoor air quality is to eliminate individual sources of pollution or to reduce their emissions. Specific sources of pollution are radon, tobacco smoke, carbon monoxide, biological contaminants, volatile organic compounds, formaldehyde, pesticides, asbestos, lead, nitrogen dioxide, and respirable particles. In many cases, source control is also a more cost-efficient approach to protecting indoor air quality than increasing ventilation, because increasing ventilation can increase energy costs. Another approach to lowering the concentrations of indoor air pollutants is to increase the amount of outdoor air coming indoors. Most heating and cooling systems, including forced air-heating systems, do not mechanically bring fresh air into the office.