This study presents a methodology for including weather factors when simulating radon levels inside a dwelling using the CONTAM modelling software. The main purpose is the development of a reliable tool for assessing the various factors that affect radon concentrations, which would increase the possibility of improving indoor air quality. Indoor radon concentrations and weather data collected over six months are presented together with simulation results and compared both qualitatively and quantitatively. The methodology described should assist in simulating more realistic indoor radon concentration variations over a period of several months that can afterwards be used when designing homes with radon mitigation features.
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