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Large decrease of radon concentrations in new-built Swedish dwellings

This study evaluates the dependencies between building year and radon levels in Swedish dwellings. The data from measurements analyzed during 2015-2017 shows a significant decrease in radon concentrations in new-built dwellings compared to the Swedish reference level. The study also investigates the impact of foundation and ventilation types on radon levels in single-family and multi-family houses. The findings suggest that the use of mechanical or balanced mechanical ventilation, along with slab-on-grade foundation, contributes to lower radon concentrations. These results have important implications for building practices and radon mitigation efforts.

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Large decrease of radon concentrations in new-built Swedish dwellings

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  1. Large decrease of radon concentrations in new-built Swedish dwellings by TryggveRönnqvist, Radonova tryggve.ronnqvist@radonova.com 2018 International Radon Symposium™

  2. Large decrease of radon concentrations in new-built Swedish dwellings Dependencies between building year and radon levels in Swedish dwellings were evaluated: Data from measurements analyzed during 2015-2017 Dwellings with building years from 1950 until 2016 Dependencies of foundation and ventilation type were investigated Data were compared against the Swedish reference level of 200 Bq/m3 (5.3 pCi/l) 2018 International Radon Symposium™

  3. Large decrease of radon concentrations in new-built Swedish dwellings Measurements in single-family houses 2018 International Radon Symposium™

  4. Large decrease of radon concentrations in new-built Swedish dwellings Measurements in apartments in multi-family houses 2018 International Radon Symposium™

  5. Large decrease of radon concentrations in new-built Swedish dwellings Single-family houses = ”Småhus” Multi-family houses = ”Flerbostadshus” Numberof new-builtdwellings in Sweden (source: SCB) 2018 International Radon Symposium™

  6. Large decrease of radon concentrations in new-built Swedish dwellings New buildings: are radon levels increasing with time? Measurements in single-family houses built 2002-2004 No statistical significant change can be seen, Kruskal-Wallis test (p-value = 0.4159) 2018 International Radon Symposium™

  7. Large decrease of radon concentrations in new-built Swedish dwellings Crawl space Basement Split level Slab on grade Radon levels and foundationtypes in single-family and multi-family houses 2018 International Radon Symposium™

  8. Large decrease of radon concentrations in new-built Swedish dwellings Today, most Swedish single-family houses arebuiltwithSlab on grade as foundationtype and veryfew new houses haveBasements. 2018 International Radon Symposium™

  9. Large decrease of radon concentrations in new-built Swedish dwellings Slab on gradetogetherwithBasementare the dominatingfoundationtypes in multi-family houses 2018 International Radon Symposium™

  10. Large decrease of radon concentrations in new-built Swedish dwellings Single-family houses Multi-family houses New single-family houses with mechanical or balanced mechanical ventilation have in average much lower radon concentrations than houses with only natural ventilation. Radon levels and ventilation types 2018 International Radon Symposium™

  11. Large decrease of radon concentrations in new-built Swedish dwellings Today, very few single-family houses have only natural ventilation, mechanical or balanced mechanical ventilation are dominating. 2018 International Radon Symposium™

  12. Large decrease of radon concentrations in new-built Swedish dwellings Today, most new multi-family houses have balanced mechanical ventilation. 2018 International Radon Symposium™

  13. Large decrease of radon concentrations in new-built Swedish dwellings Possible explanations for the decreased radon concentrations in new-built Swedish dwellings : Better and more uniform building practice. Mechanical or balanced mechanical ventilation are used in almost all new Swedish dwellings. Very few new single-family houses are built with basement, the dominating foundation type is slab on grade. 2018 International Radon Symposium™

  14. THANK YOU !! TryggveRönnqvist +46 706591708 tryggve.ronnqvist@radonova.com 2018 International Radon Symposium™

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