Abstract
The European Code Against Cancer (ECAC) provides evidence-based recommendations to help individuals reduce their cancer risk. For the 5th edition (ECAC5), recommendations on ultraviolet radiation (UVR) and indoor radon exposures were updated, and complementary recommendations for policymakers were introduced. UVR and radon are classified as carcinogenic to humans (group 1 carcinogens) in the International Agency for Research on Cancer (IARC) Monographs. Solar UVR and, to a lesser extent, artificial forms of UVR exposure are major causes of skin cancer, while radon gas is a leading cause of lung cancer. This paper summarises the evidence for retaining and refining these recommendations. For individuals, ECAC5 advises avoiding excessive sun exposure, especially in children, using sun protection, and never using sunbeds; for radon, checking local radon maps, seeking professional measurement where appropriate and taking remedial action, if necessary, are recommended. For policymakers, ECAC5 encourages harmonised UVR protection measures across the European Union, enforcement of regulations concerning indoor tanning devices, and enabling access to testing of radon levels, and support for mitigation and remediation. These recommendations provide actionable, evidence-based recommendations to help reduce cancer risk and align with Europe's Beating Cancer Plan.