Detailed radon measurements and ventilation testing were carried out in five residential premises in Hong Kong. Continuous radon detectors were located in the bedrooms of each site and corresponding CO2 decay tests were con ducted to estimate the ventilation rate. Four air-conditioning operation modes were used in the measurements. Data obtained from the measurements were used to verify the validity of a simple mass balance model. In this paper, fac tors including the elevation of the building, geographical composition of the area, diurnal variation of the radon level and influence of the ventilation rate on indoor radon level are also discussed.
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