Cities are flooded by many terabytes of mobility data, including information about cars, public transport and air quality. What to do with all this information? The EU-funded EMERALDS project will develop a toolset for mobility data. Its aim is to facilitate the processing and analysing the large data streams. The toolset will enable the stakeholders of the urban mobility ecosystem to collect and manage ubiquitous spatio-temporal data of high-volume, high-velocity and of high-variety, analyse them both in online and offline settings. It will be tested in the pilot cities of Utrecht and The Hague. Specifically, the toolset will make it possible to import data to real-time responsive algorithms and visualise results in interactive dashboards.