Abstract
A controlled test atmosphere system for gaseous pollutants was designed and constructed. For a reliable characterization of indoor air pollution, a suitable set of sampling and analysis procedures has to be devised and accomplished. The precision and accuracy of the measurements must be determined exactly for a correct interpretation of the results.(1–3) The two main difficulties appear to be the actual generation of the individual standard and the preparation of physico-chemically thoroughly characterized mixtures. This system utilized two methods for generation of dynamic standards: permeation tubes (4–9) and gas saturators. Special care also was devoted to the achievement of both a good time stability of the concentrations of the standard mixtures and a satisfactory agreement between expected and measured concentration values.