This article comprises 'City Know-how' briefings for the published research papers in this issue. The aim of each briefing is to translate research findings into actionable insights for practitioners and communities who want to support urban health and health equity. The purpose is to support a flow of knowledge for more effective action; to promote and build health while reducing risks for human and planetary health. We hope these 'City Know-hows' will foster connections and conversations between researchers, practitioners, policy-makers, communities, and decision-makers in cities. Cities & Health, together with our 'City Know-how' partner, Building Health Lab, and our four global knowledge partners; invite communities, researchers, practitioners, and policy-makers to join our networks and contribute to the dialogue. You can access our interactive platform for 'City Know-hows' at www.cityknow-how.com

This article comprises a number of 'City Know-how' briefings from our published research papers. The aim of each briefing is to translate research findings into actionable insights for practitioners and communities who want to support urban health and health equity. The purpose is to support a flow of knowledge for more effective action; to promote and build health while reducing risks for human and planetary health. We hope these 'City Know-hows' will foster connections and conversations between researchers, practitioners, policy-makers, communities, and decision-makers in cities. Cities & Health, together with our 'City Know-how' partner, Building Health Lab, and our four global knowledge partners; invite communities, researchers, practitioners, and policy-makers to join our networks and contribute to the dialogue. You can access our interactive platform for 'City Know-hows' at www.cityknow-how.com.

This article comprises nine more 'City Know-how' briefings, each offers research findings translated into actionable insights for urban health practitioners, communities and built environment professions. Designed to facilitate knowledge sharing, these briefings show how to use urban planning and design to enhance health outcomes while reducing risks to both human and planetary health. We hope they will foster connections and conversations between researchers, practitioners, policy-makers, communities, and decision-makers in cities. Cities & Health, together with our 'City Know-how' partner Building Health Lab and our four global knowledge partners; invite communities, researchers, practitioners, and policy-makers to join our networks and contribute to the dialogue. You can access our interactive platform for 'City Know-hows' at www.cityknow-how.com.

The importance of urban health in achieving population and planetary health goals is increasingly recognized. Cities offer important opportunities to improve health and wellbeing while also presenting significant challenges. As our understanding of, and evidence, for the importance of determinants of health beyond health care have grown, the need for urban health policies and actions that transcend disciplinary and sectoral boundaries and involve multiple stakeholders in urban decision-making has become clearer. Current urban health practice builds on decades of conceptual and operational work. This paper traces the evolution of the urban health paradigm through research, policy and practice in recent decades. We suggest that, despite the proven utility of urban health as a paradigm and its conceptual and practical evolution for effective urban health governance, significant challenges remain, especially related to implementing the systems approaches needed to improve health and wellbeing amidst the complexity of urban dynamics.

This article comprises ten 'City Know-how' briefings, each offers research findings translated into actionable insights for urban health practitioners, communities and built environment professions. Designed to facilitate knowledge sharing, these briefings show how to use urban planning and design to enhance health outcomes while reducing risks to both human and planetary health. We hope they will foster connections and conversations between researchers, practitioners, policy-makers, communities, and decision-makers in cities. Cities & Health, together with our 'City Know-how' partner Building Health Lab and our four global knowledge partners; invite communities, researchers, practitioners, and policy-makers to join our networks and contribute to the dialogue. You can access our interactive platform for 'City Know-hows' at www.cityknow-how.com.

This article comprises 'City Know-how' briefings, designed to translate research findings into actionable insights for urban health practitioners. The purpose is to support the flow of knowledge for more effective action in promoting and building health while reducing risks for human and planetary health. We hope these briefings will foster connections and conversations among researchers, practitioners, policy-makers, communities, and decision-makers in cities. Cities & Health, together with our partner Building Health Lab and our two global knowledge partners, the International Society for Urban Health and SALUS.Global, invites all stakeholders to join our networks and contribute to the dialogue. A full repository of all published 'City Know-how' briefings can be found on our platform at https://www.cityknow-how.com.

Cities and other human settlements are major contributors to climate change and are highly vulnerable to its impacts. They are also uniquely positioned to reduce greenhouse gas emissions and lead adaptation efforts. These compound challenges and opportunities require a comprehensive perspective on the public policy of human settlements. Drawing on core literature that has driven debate around cities and climate over recent decades, we put forward a set of boundary objects that can be applied to connect the knowledge of epistemic communities and support an integrated urbanism. We then use these boundary objects to develop the Goals-Intervention-Stakeholder-Enablers (GISE) framework for a public policy of human settlements that is both place-specific and provides insights and tools useful for climate action in cities and other human settlements worldwide. Using examples from Berlin, we apply this framework to show that climate mitigation and adaptation, public health, and well-being goals are closely linked and mutually supportive when a comprehensive approach to urban public policy is applied.

The importance of urban health in achieving global and planetary health goals is increasingly recognized. Cities offer important opportunities to improve health while also presenting significant challenges. As our understanding of and evidence for the importance of determinants of health beyond health care have grown, the need for urban health policies and actions that transcend disciplinary and sectoral boundaries and involve multiple stakeholders in urban decision-making has become clearer. Current urban health practice builds on decades of conceptual and operational work. This paper traces the evolution of the urban health paradigm through research, policy and practice in recent decades. We suggest that, despite the proven utility of urban health as a paradigm and its conceptual and practical evolution for effective urban health governance, significant challenges remain, especially related to implementing the systems approaches needed to improve health amidst the complexity of urban dynamics.

SUPPORTING CITY KNOW-HOW Human health and planetary health are influenced by city lifestyles, city leadership, and city development. For both, worrying trends are leading to increasing concern, and it is imperative that human health and environmental impacts become core foci in urban policy. Changing trajectory will require concerted action; the journal Cities & Health is dedicated to supporting the flow of knowledge, in all directions, to help make this happen. We wish to foster communication between researchers, practitioners, policy-makers, communities, and decision-makers in cities. This is the purpose of the City Know-how section of the journal. We invite you to join these conversations. In order to strengthen the community of interest, we would like to include many and varied voices, including those from younger practitioners and people who are supporting health and health equity in everyday urban lives.

Evidence supports what we all intuitively know; that human health and planetary health are heavily influenced by the urban environments we create. Urban policy, programmes and projects have the potential to escalate problems or to provide solutions. Cities & Health is dedicated to supporting the flow of knowledge required to support action to reduce risks for human and planetary health. Our aim is to foster connections and conversations between researchers, practitioners, policy-makers, communities, and decision-makers in cities. Research for city practice includes 'City Know-how' briefings derived from research findings to support access to, and dissemination of, key lessons. The team at Cities & Health, and our knowledge partners (International Society for Urban Health and SALUS.Global), invite you to join their networks, and contribute to the dialogue. We encourage all our stakeholders to consider publishing in Cities & Health to help influence urban policy.

This article comprises eighteen 'City Know-how' briefings. Each designed to translate research findings into actionable insights for practitioners and communities who want to support urban health. Their purpose is to support the flow of knowledge for more effective action to promote and build health while reducing risks for human and planetary health. We hope they will foster connections and conversations between researchers, practitioners, policy-makers, communities, and decision-makers in cities. Cities & Health, together with our 'City Know-how' partner Building Health Lab and our two global knowledge partners, the International Society for Urban Health and SALUS.Global, we invite communities, researchers, practitioners, and policy-makers to join our networks and contribute to the dialogue. A full repository of all published 'City Know-how' briefings can be found at our platform www.cityknow-how.com.

This article comprises six 'City Know-how' briefings. Each designed to translate research findings into actionable insights for practitioners and communities who want to support urban health. Their purpose is to support the flow of knowledge for more effective action to promote and build health while reducing risks for human and planetary health. We hope they will foster connections and conversations between researchers, practitioners, policy-makers, communities, and decision-makers in cities.Cities & Health, together with our 'City Know-how' partner Building Health Lab and our two global knowledge partners, the International Society for Urban Health and SALUS Global Knowledge Exchange, we invite communities, researchers, practitioners, and policy-makers to join our networks and contribute to the dialogue. A full repository of all published 'City Know-how' briefings can be found on our platform www.cityknow-how.com.

We describe neighbourhood community ‘walkabouts’ using photography as a pragmatic, low-cost methodology for engaging with disadvantaged and marginalised communities, to assist local authorities providing and consulting about city services. Using a health lens frame on neighbourhoods as providing or restricting opportunities for play, interaction, physical activity and nutrition for children and families, we conducted two walkabouts using photography in an ethnically diverse European city. The meeting point for Somali and other ethnically diverse community members, practitioners, elected representatives and academics in this action research was a shared wish to improve the neighbourhood public realm for child health and development, family wellbeing and confident childrearing. The methodology brought opportunities to improve local physical environments for communities, to develop relationships with neighbours and authorities, and to influence statutory planning, decision-making and urban investment. Neighbourhood walkabouts with photography can serve as an accessible platform for communication and advocacy, and help decision-makers effectively hear the voices of disadvantaged and marginalised communities.