AUTHOR=Ding Bowei , Wu Yunyun , Song Yanchao , Hou Changsong , Shang Bing TITLE=Analysis of indoor radon concentration levels and trends in China JOURNAL=Frontiers in Public Health VOLUME=13 YEAR=2025 URL=https://www.frontiersin.org/journals/public-health/articles/10.3389/fpubh.2025.1524179 DOI=10.3389/fpubh.2025.1524179 ISSN=2296-2565