Ganymede is a network of connected plants : thousands of “nodes” spread throughout the city capture the level of concentration of various toxic gases, send the data to the Cloud and determine the quality of the air in the particular zone covered. With Ganymede. all you have to do is look at the board indicating information from the nearest node, a colour code varying from red to green indicates whether the air is healthy or polluted. It is also possible to connect to the website where an interactive map shows pollution levels for each node. Data collected by our nodes is available as Open Data via the API; the information can be used by anyone on external applications.