On harmonization of radon maps

Background: Maps are important tools for geographic visualization of the state environment with respect to resources as well hazards. One hazards is indoor radon (Rn), believed be most cause lung cancer after smoking. In particular, part Rn mitigation policy and in compliance European Basic Safety Standards, EU Member States have declare areas elevated concentration levels. However, this done by national authorities according individually chosen criteria, resulting maps not easily comparable.
 Objective: We aim identify causes lack compatibility suggest solutions problem.
 Design: This study draws from experiences recent research projects, literature, personal involvement authors discussions.
 Results: An overview given on effects between maps. Existing reported. Options defining identifying it discussed. Methods harmonization, that is, remediating compatibility, addressed.
 Conclusions: The difficulty harmonization increases aggregation level data which support Harmonization more difficult, higher aggregated priority area technically non-trivial, theoretical efforts practical tests will undertaken.