Urbanization is a global phenomenon and poses pressing health challenges as urban dwellers carry a high risk for mental ill-health. Social stress due to built or population density might play a major role here, yet interactions with other environmental and health risk factors are still poorly understood. “Your Emotional City” is a joint project of Interdisziplinäres Forum Neurourbanistik e. V., Charité – Universitätsmedizin Berlin, Humboldt-Universität zu Berlin and Futurium – House of the Futures. Funded by the Berlin University Alliance as part of the Excellence Strategy of the German federal and state governments. Using a specially designed app and a citizen science/ecological momemtary assessment framework, we track individuals’ wellbeing and emotional/aesthetic responses to the city throughout their day, geolocating this to their position.