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International audience; Environmental noise is a major pollutant in contemporary cities and calls for the ac-10 tive monitoring of noise levels to spot the locations where it most affects the people's health and well-being. However, due to the complex relationship between environmental noise and its perception by the citizens, it is not sufficient to quantitatively measure environmental noise. We need to collect and aggregate contextualized-both quantitative and qualitative-data about the urban environmental noise so as to be 15 able to study the objective and subjective relationships between sound and living beings. This complex knowledge is a prerequisite for making efficient territorial public policies for soundscapes that are inclined towards living beings welfare. In this paper, we investigate how Mobile Phone Sensing (MPS)-aka crowdsensing-enables the gathering of such knowledge, provided the implementation of sensing protocols 20 that are customized according to the context of use and the intended exploitation of the data. Through three case studies that we carried out in France and Finland, we show that MPS is not solely a tool that contributes to sensitizing citizens and decision-makers about noise pollution; it also contributes to increasing our knowledge about the impact of the environmental noise on people's health and well-being 25 in relation to its physical and subjective perception.

International audience; Mobile Phone Sensing offers a great opportunity toward the large scale monitoring of urban phenomena, such as the exposure of the population to environmental noise. Our research aims to make available a supporting mobile application together with the associated platform for the analysis of the contributed observations. The technological issues arising have been partly solved but a gap remains between the need for the massive collection of relevant data, and the quantity and accuracy of the measurements that are actually gathered. This paper presents our iterative research process to tackle this challenge, which combines technological innovation and social design. The presented research results contribute to a better understanding of why and how people use mobile phone sensing applications; the results also inform how to best leverage mobile crowd-sensing in the development of smart cities and how it may serve addressing urban challenges related to, e.g., public health or urban planning.; Le recueil de données via les smartphones ouvre des perspectives importantes pour le suivi à grande échelle de phénomènes urbains, dont l'exposition de la population au bruit. Notre recherche vise à rendre disponible une application pour smartphone et sa plateforme associée, pour l'analyse et la gestion des observations recueillies. Si les défis technologiques ont en partie été levés, un écart significatif persiste entre, d'une part la nécessité d'un recueil massif de données significatives et, d'autre part la quantité et la précision des données de mesure actuellement produites et récoltées. Cet article présente notre processus de recherche itératif qui, afin de relever ces défis, combine innovations technologiques et design social. Les résultats présentés ici contribuent à une meilleure compréhension des raisons et conditions dans lesquelles le public utilise des applications mobiles de recueil de données; les résultats nous informent également sur les possibilités d'amélioration du crowd-sensing via smartphones pour le développement de projets de villes intelligentes et pour la santé publique et l'aménagement urbain.