Helsinki experienced a nearly one-third reduction in carbon emissions over the past year, largely due to the complete cessation of coal use in district heating. This marks a significant improvement in the city’s environmental performance. While overall emissions decreased substantially, transportation has now become the largest single source of pollution within Helsinki. The shift highlights the impact of energy source changes on urban emissions profiles. City officials are now focusing on strategies to address the growing contribution from vehicle traffic. Further analysis will be needed to determine the long-term sustainability of these emission reductions. The change demonstrates a successful energy transition but underscores the need for parallel efforts in transport decarbonization.