“…At the same time, there is evidence that cities also need to engage with the public, as the implementation of these plans and strategies depends on collaboration with citizens. Here, CS can play a role, e.g., in contributing to the definition of new targets and metrics (West and Pateman, 2017), as an accepted methodology and source of generating data and information (Roy et al, 2012;Fritz et al, 2019;Ferrari et al, 2021), in monitoring SDGs indicators (Fraisl et al, 2020), in supporting SDGs targets (Ajates et al, 2020), and raising awareness of SDGs (Heinisch, 2021;Moczek et al, 2021). Our study demonstrates that most CS research activities focus on environmental pollution and resources (e.g., air, soil, water, noise, waste, biodiversity, land cover and land use change) by engaging citizens into diverse types of activities, from contributory (crowd-sourcing and passive sensing) to collaborative (active sensing) and co-creation (that sometimes include co-designing DIY monitoring tools) or combining these three levels of citizen engagement together.…”