The Environmental Justice Measure (EJM) is Westminster City Council’s interactive, publicly available tool that highlights access to a healthy environment across Westminster, showing how different residents are impacted by climate change. The EJM brings together a wide range of environmental datasets, including air quality, access to open spaces, flood risk and building efficiency. When overlayed with the Index of Multiple Deprivation, insight can be given on the impact on quality of life. The EJM leads evidence-based, fairer decision making in the council, including allocating funds to projects, planning outreach events and informing planning policies. It is also used at residents’ meetings to explain decisions, council priorities, fostering greater understanding of council actions. By using the EJM, not only does the council improve the targeting of their environmental measures, but also maximises effective spending – both now and in the future.