The levels of radon in the ground depend on factors such as the extent to which the elements uranium and radium are present in our rock types and therefore also our soil types. Radon gas comes from these elements and moves through the soil layer with the aid of air and groundwater. This means, for example, that there is a greater risk of radon in buildings constructed on sand and gravel.
Radon is a radioactive gas which forms naturally when the Uran238 element decays. In turn, the radon gas decays into radon progeny. Radon progeny are radioactive metal atoms which get caught in our respiratory tracts during inhalation. According to the World Health Organization, WHO, depending on where you live, 3%-14% of all incidences of lung cancer are caused by radon.