Multiple studies demonstrate that residential and occupational radon exposure at reference levels of 100 Bq/m3 and 300 Bq/m3 poses significant health risks, primarily by increasing the incidence of and mortality from lung cancer.
The retrieved papers consistently establish that residential and occupational radon concentrations at or above the 100 Bq/m3 and 300 Bq/m3 thresholds are major risk factors for lung cancer. Studies such as [0], [3], [6], [7], and [8] explicitly evaluate radon exposure around these reference levels and quantify the attributable health burdens. None of the provided papers refute the claim.