Air pollution is the largest environmental threat to human health worldwide. Health professionals and agencies are usually the most trusted voices in their communities, so when they are actively engaged on climate change and air pollution, they can reframe these is sues as questions of public health and help move public opinion and policy. With support from the Clean Air Fund, Vital Strategies has partnered with city governments to assemble a set of case studies showcasing real-world examples of how engagement with public health organizations and practitioners can accelerate solutions that promote clean air, climate and health simultaneously.