Factors influencing temporal variations of radon concentration in high-rise buildings

Long-term radon time series were analyzed in 14 rooms and offices to search factors influencing indoor radon concentration in high-rise buildings. Radon entry to living rooms is determined both by diffusion from building materials and advection from adjoined low-ventilated spaces. Humans affect on seasonal and diurnal radon concentration changes in high-rise buildings by activating ventilation system. Indoor-outdoor temperature difference significantly influence on the air exchange rate under uncontrolled ventilation, which is especially important in new energy efficient buildings. •Time-series reveal Rn influencing factors in high-rise buildings.•Rn diffusion from building materials is important source.•Rn advection from low-ventilated spaces is important entry mechanism.•Human control over ventilation is main factor.•Temperature dependent air exchange rate is main natural factor.