Anyone who owns an Android smartphone will soon be able to contribute to a research project simply by recording surrounding noise. The purpose is to establish a participatory map of the sound environment. The NoiseCapture application, which was developed by researchers from the CNRS and IFSTTAR, uses signal processing algorithms to calculate acoustic indicators during the user’s trips. These geolocated indicators are then anonymously stored in a database to develop noise maps that reflect reality as closely as possible, with extremely dense connections. These noise maps obtained via smartphone data could be used by local governments to implement more targeted plans of action for preserving or improving the quality of urban sound environments.