Urban areas cause over 70% of direct and indirect ⁠CO2⁠-emissions worldwide. Carbon market mechanisms under Article 6 of the Paris Agreement can offer new opportunities for the mobilisation of urban emission reduction measures and policies. This research project first examined the prevalence and experience of urban reduction projects within the framework of the Clean Development Mechanism (CDM), Nationally Appropriate ⁠Mitigation⁠ Actions (NAMAs) and Transformative Actions Programs (TAP). Building on this, conceptual approaches to the implementation of urban Art. 6 activities were developed. In addition, the study discusses approaches to determine the additionality and various financing options for urban mitigation activities.