An experiment was carried out to measure the radon and its airborne daughter product levels in the bed rooms of 40 houses. The houses chosen for this experiment were constructed from same building material and the bed rooms chosen were approximately of similar dimensions. The main objective of this experiment was to study the living standards (e.g. ventilation of the houses) of the residents from the measured values of radon and its daughter product concentration levels. Our results indicate that, except for a few cases, one can predict the living habits of the occupants from the measured values of radon and its daughter concentration levels.