indoor air that contains no known contaminants at harmful concentrations and with which a substantial majority of the people exposed to the air do not express dissatisfaction. Good indoor air quality inside a building results from:

• Introducing an appropriate amount of outside air into the building through the HVAC systems
• Locating outside air intakes so that the outside air introduced into the HVAC systems is of the best possible quality
• Proper filtration
• Proper air distribution
• Proper removal of indoor pollutants
• Proper commissioning of the building and its building systems.