The Clean Air Council will be developing a new 2023 – 2027 CAC inter-governmental Declaration and will be undertaking a CAC progress report tracking municipal implementation of CAC declaration actions. During this workshop CAP will be sharing initial plans and seeking municipal input for the updating of the Declaration and Progress Report. Then Nadia and Ralph from Corporate Knights will be sharing and seeking municipal input regarding their first edition of the Sustainable Cities Index. How do these indices and metrics provide insights and support for municipal implementation? How may these indices be able to track implementation at a regional scale? What may be the value of advancing a regional index?