In modern times, the quality of outdoor air is rapidly declining worldwide due to pollution from human activities. This fact and other factors such as poor ventilation, indoor combustion emissions, and leaks are contributing significantly to deteriorating indoor air quality. The outcome is an unpleasing mix of health symptoms that has led to reduction in work productivity and the phenomenon known as sick building syndrome (SBS).

Due to this there has been increased efforts including certifications and standards that are being designed with the goal of making buildings support and promote health and the wellbeing of its occupants. It has also been emphasized by Center for Disease Control (CDC) that health promotion programs aim to improve the quality of indoor air and environment will improve productivity and wellbeing of employees.