First launched in Galway, Ireland in 2012, the International Symposium on Environment and Health (ISEH) has evolved through years of dedicated development into a high-end global academic platform for environment and health research. It brings together multidisciplinary scientists, industrial consulting specialists, and public administration practitioners from across the world. Adhering to the consistent mission of the symposium series, ISEH 2026 adopts the theme: One Earth, One Health, One Future. This grand convention will assemble distinguished experts at home and abroad to explore cutting-edge frontiers in environment and health. Participants will share the latest research findings, showcase advanced research methodologies and technologies, analyze emerging industry trends, and outline research priorities for the years ahead. Serving as a vital communication bridge, the symposium aims to foster in-depth academic exchanges and tangible collaborations between global researchers and industry practitioners. It seeks to formulate innovative solutions to regional and worldwide environmental health challenges, and facilitate the creation of new comcepts and frameworks for sustainable healthy development.