60 Visit the project website The CurieuzeNeuzen project used in its recruitment process both traditional media, including TV, radio, printed media, billboards, as well as online media such as websites and social media. In addition, citizens were involved in innovative ways, including colourful V-boards as points of recognition of participants; postcards; ads at the Ringland Rock Festival (June 2016); a booth at a science innovation festival (September 2018); video clips with well-known artists as ambassadors; and a large knowledge event with 900 citizen researchers in Antwerp in 2016. On the other hand, the CurieuzenAir project (involving this time the city of Brussels) also collaborated with local newspapers, used social media, and launched a website in three main languages (French, Dutch and English). To reach more vulnerable communities, they followed an innovative approach by collaborating with a local NGO that engaged the community through air quality city walks, individual calls, and dissemination activities in public places such as medical homes and key stores in the neighbourhood.