Indoor Air Quality (IAQ) can be defined as the nature or quality of air as it affects the health and well-being of building occupants. As per EPA & National Institute for Occupational Safety & Health (NIOSH), and others, show indoor pollutant level may be 10 to 100 higher than outdoors.
As per the World Health Organisation, up to one-third of buildings in industrialized countries are unhealthy and not good for inhalation on a daily basis. And the combined consequences of diminished productivity and staff absenteeism could amount to 1% of GNP in industrialised countries. And hence the IAQ is so important.