Welcome to the catalogue of EXPANSE: EXPANSE. The Urban Exposome is the complex mixture of social and environmental factors in the urban environment that collectively have an impact on health. Currently, slightly over 70% of Europe’s population lives in an urban environment. This percentage is expected to exceed 80% by 2030. It is therefore crucial that European urban areas provide a healthy living environment. The EXPANSE project addresses one of the most pertinent questions for urban planners, policy makers, and inhabitants in Europe: “How to maximize health in a modern urban environment?”.