Just like CurieuzenAir, Les Chercheurs d’Air measured the concentration of NO2 in Brussels. Les Chercheurs d’Air monitored NO2 concentrations at 134 locations in Brussels for a whole year. The two citizen surveys are therefore very complementary. By taking measurements for a year, Les Chercheurs d’Air was able to map the variation of NO2 concentration over time. CurieuzenAir focused on a short measurement period of four weeks but carried out measurements at 3.000 sites throughout the Brussels region. This allows us to identify differences between municipalities, neighbourhoods and even streets. Furthermore, the CurieuzenAir dataset allows us to estimate the NO2 concentrations to which all inhabitants of Brussels are exposed.
The results obtained by Les Chercheur d’Air and CurieuzenAir are very similar. For example, in both studies, the European standard for NO2 was exceeded in about 1.5% of the measurement points. The average NO2 concentrations were also very similar: 23 µg m3 in Les Chercheur d’Air and 24 µg m3 in CurieuzenAir.