Radon is the second leading cause of lung cancer

As early as 1987, radon was listed as an important indoor carcinogen by the International Cancer Research Institute. Radon is the only nuclide in the specific data of chronic exposure action level recommended by ICRP. It has been published as one of 19 major environmental carcinogens by WHO.

The harm of radon, take the United States as an example: the number of cancer deaths caused by radon ranks first in the number of accidental deaths. According to statistics, it is estimated that 21000 cases of lung cancer in the United States every year are caused by indoor radon gas, which has become the second largest cause of lung cancer. 

Lung cancer caused by radon is 2 / 3 of traffic accidents in the Netherlands. 

Radon is the fifth leading cause of all cancers in Sweden.