Climate Centre Resource, with the Global First Aid Reference Centre inputs on FIRST AID during a heatwave. The guide is structured to be easy to navigate – following a simple roadmap. The main sections are Understanding Heatwaves that provides basic information on heatwaves, high-risk locations and vulnerable groups; Preparing for a Heatwave focused on partnerships with city stakeholders; During the heatwave which outlines actions to help reduce the risk of heat impacts among various vulnerable groups; and Taking Stock and Lessons Learnt that provides guidance on conducting an after-action review as well as integrating learning into Preparing for the Next Heatwave that is the final section of this guide.