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. 2021 Sep 2;11:17551. doi: 10.1038/s41598-021-96928-x

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Periods marking notable changes in Swedish and Canadian residential property innate radon risk, and key build code and energy use trends since 1960. Panel (A). Yearly geometric mean radon levels ± CI_95% for residential property construction in Sweden from 1968 to 1987, indicating build codes that applied during each year. Panel (B). Yearly geometric mean radon levels ± CI_95% for residential property construction in Canada from 1998 to 2017, indicating build codes that applied during each year. Panel (C). Timeline schematic of 1960–2020, indicating relevant events in Sweden (left, blue) and Canada (right, red). Figures were prepared using GraphPad Prism 9.1.1 (225) (www.graphpad.com).