What role does CO2 play in measurement of IAQ?
In order to evaluate excessive indoor air pollution and its health effects, it is important to identify which pollutants are present in a room or building and to determine how the levels of each vary with the time. Monitors are available for particulates and a few gases such as radon, formaldehyde, nitrogen dioxide, sulphur dioxide and carbon monoxide; however analysis of each can be complex, costly and time consuming. In some situations the source of contamination may be unknown and testing for a broad spectrum of possible pollutants may be required. Although it is extremely expensive and difficult to detect or measure the indoor air contaminants, CO2 (carbon dioxide) has been recognised by ASHRAE (American Soceity for Heating, Refrigeration and Airconditioning Engineers) as the surrogate ventilation index or the only measurable variable. Carbondioxide levels in an airconditioned room is a good indicator of occupancy and ventilation rate within a space. CO2 by itself is not considered
