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. 2021 Nov 3;11:21562. doi: 10.1038/s41598-021-00882-7

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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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A schematic illustration of the participant selection process that was used in the present study. Of a total of 514,866 participants, 4632 thyroid cancer participants were matched with 18,528 control participants for age, sex, income, and region of residence. Then, the thyroid cancer and control groups were linked with meteorological data and air pollution data before the index date.