Since 2014, a growing body of critical research has pointed out flaws in smart city development. It has been described as too technology-led and business-oriented, diminishing citizens' agency and causing digital divides. As the agenda keeps spreading, there is an urgent need to develop more participatory, inclusive and bottom-up approaches to balance interests of those currently in strong power positions, such as large corporations. Participatory design (PD) and participatory approaches in general have been suggested as a remedy, but they often tend to be local, small-scale and short-term. Therefore, their impacts are often modest as well. We suggest that we need to start thinking about ways to create scalable approaches that would grow the temporal and spatial impact of actions and practices that intend to increase citizens' understanding and control over new technologies, i.e. their technological agency. Without making sure that more people have adequate knowledge and sufficient control and mastery of technologies, societal discussion and ultimately, political decisions, are left to few experts. We explore the potential of public libraries to act as an ally and cooperation partner in participatory design and technology education in general, with a significant potential to broaden micro-level actions' impact.