Radon in houses of Kowary – Sudety Mountains, Poland

The presence of uranium makes the Kowary area characterized by an increased concentration of radon in the air and the living houses. Measurements of periodic radon concentrations in dwellings of Kowary were carried out three times in the last 20 years. It can be observed that 20 years ago level of radon concentrations in houses of Kowary were lower than today. Measurements carried out in Kowary over 20 years have shown that residents are exposed to radon concentrations, which often exceed 300 Bq m⁻³ – a reference level recommended by the European Union. The present geometric mean of radon concentration in houses of Kowary (260 Bq m⁻³) exceeds the geometric mean of radon concentration of buildings in the rest of Poland (142 Bq m⁻³).