Notes: The four national cancer plans planned and implemented from 2000 to present day combined with investments in cancer control and political focus represents the core of the Danish national cancer control strategy. The cancer plans constitutes systematic, equitable and evidence-based plans and strategies for prevention, early detection, diagnosis, treatment, follow-up including rehabilition, palliation and relapse control. Radon as a cancer risk factor was described as early as Cancer Plan I (2000) and Cancer Plan II (2005). These plans describe the benefit of alleviating this risk factor. These plans also compiles knowledge regarding the subject including knowledge and initiatives in neighbour countries as well as references to cost-benefit analyses regarding radon prevention. Reduction of radon exposure to children in housing institutions and schools is emphasized.    