EO and GNSS are invaluable tools for the transition to smart, connected, and climate-neutral cities. City authorities, urban planners, real estate agencies, cultural heritage managers, and surveyors all use solutions powered by Copernicus and Galileo/EGNOS to perform a wide range of applications. Earth Observation provides valuable information in support of urban planning, monitoring of informal dwellings, and informing the progress of urban greening. Moreover, Copernicus-based services provide essential information on air quality in urban environments, measuring particles that might affect the health of citizens and monitoring greenhouse gas emissions. This is also critical when monitoring cultural heritage sites, whereby the impact of air quality and potential ground subsidence may become catastrophic. EGNSS-based solutions are also used, in conjunction with EO, to accurately survey and map urban areas and to build advanced 3D models of the built environment.