CurieuzenAir reveals a striking disparity in air pollution levels across Brussels

Between 25 September and 23 October 2021, 3.000 Brussels citizens participated in CurieuzenAir, the largest ever citizen science project on air quality in our capital. For one month, citizen scientists mapped the concentration of nitrogen dioxide (NO2) — a key indicator of air pollution caused by traffic — in their streets via measuring tubes on the facades of their homes. The project resulted in a unique dataset showing the impact of road traffic on air quality in Brussels in great detail. Results range from ‘excellent’ to ‘extremely poor’ air quality across Brussels, with a stark contrast in air quality between socio-economically vulnerable neighbourhoods and green, well-off ones. CurieuzenAir also brings good news: the data show that air quality in Brussels has improved considerably in recent years.

More information on these new estimates is available via



ELLIS is funded by the Belgian Federal Science Policy (BELSPO) through the BRAIN-be 2.0 (2018-2023) programme.

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Project coordinator

Prof. dr. Brecht Devleesschauwer

Sciensano, Department of Epidemiology and Public Health, Service Lifestyle and Chronic Diseases