AUTHOR=Peng Bozhezi , Wang Tao , Zhang Yi , Li Chaoyang TITLE=How to improve public environmental health by facilitating metro usage on weekend: exploring the non-linear and threshold impacts of the built environment JOURNAL=Frontiers in Public Health VOLUME=12 YEAR=2024 URL=https://www.frontiersin.org/journals/public-health/articles/10.3389/fpubh.2024.1469578 DOI=10.3389/fpubh.2024.1469578 ISSN=2296-2565