Use of a multi-sensor approach can provide citizens with holistic insights into the air quality of their immediate surroundings and their personal exposure to urban stressors. Our work, as part of the ICARUS H2020 project, which included over 600 participants from seven European cities, discusses the data fusion and harmonization of a diverse set of multi-sensor data streams to provide a comprehensive and understandable report for participants. Harmonizing the data streams identified issues with the sensor devices and protocols, such as non-uniform timestamps, data gaps, difficult data retrieval from commercial devices, and coarse activity data logging. Our process of data fusion and harmonization allowed us to automate visualizations and reports, and consequently provide each participant with a detailed individualized report. Results showed that a key solution was to streamline the code and speed up the process, which necessitated certain compromises in visualizing the data. A thought-out process of data fusion and harmonization of a diverse set of multi-sensor data streams considerably improved the quality and quantity of distilled data that a research participant received. Though automation considerably accelerated the production of the reports, manual and structured double checks are strongly recommended.

Atmospheric Chemistry and Innovative Technologies Laboratory INRASTES NCSR Demokritos Aghia Paraskevi 15310 Athens Greece

Department of Atmospheric Pollution National Environmental Health Centre Institute of Health Carlos 3 28220 Madrid Spain

Department of Environmental Sciences Jožef Stefan Institute 1000 Ljubljana Slovenia

Department of Epidemiology and Public Health Swiss Tropical and Public Health Institute CH 4051 Basel Switzerland

Department of Science Technology and Society University School of Advanced Study IUSS 27100 Pavia Italy

Environmental Engineering Laboratory Department of Chemical Engineering Aristotle University of Thessaloniki 54124 Thessaloniki Greece

Eucentre Foundation Via A Ferrata 1 27100 Pavia Italy

HERACLES Research Centre on the Exposome and Health Center for Interdisciplinary Research and Innovation 54124 Thessaloniki Greece

Jožef Stefan International Postgraduate School 1000 Ljubljana Slovenia

LCE CNRS Aix Marseille University 13003 Marseille France

RECETOX Faculty of Science Masaryk University 62500 Brno Czech Republic

University of Basel CH 4001 Basel Switzerland

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