The ‘problem’ itself and its state-of-the-art are discussed in this chapter by investigating the arguably ‘dominant’ models of environmental risk governance and their criticisms. Particular attention is devoted to the discussion on the role of expert and lay knowledge in current risk governance. The central contribution that this chapter offers to the book is the argument that the current prevailing models of environmental risk governance often fail to include the input of the (lay) people concerned, who are often the most affected stakeholders. This acknowledgement triggers the suggestion that participatory practices of risk monitoring such as citizen sensing may—on one side—improve people’s trust in risk policy and decision-making and—on the other side—effectively strengthen the ability of society to cope with complex risks.