This interactive Sankey diagram visualizes the causal chains behind air pollution in Geneva, tracing connections from broad factors like climate change and local traffic down to specific contributors such as housing costs and lack of investment. The diagram uses d3.v5 and the custom `d3.sankey` layout to arrange nodes and links, with draggable node rectangles and hoverable link paths rendered as SVG. Node colors apply a categorical scale, and link thickness encodes the relative value assigned in the underlying JSON data.