This visualization displays daily average PM 2.5 and PM 10 emissions across multiple monitoring stations in the Metropolitan City of Cagliari. The chart shows time series lines with a dashed World Health Organization threshold line, using a Voronoi overlay via `d3.Delaunay` for hover detection. React manages state for pollutant selection and tooltips, while D3’s `scaleTime`, `scaleLinear`, and `line` handle scaling and path generation. Data comes from a CSV of daily emissions, rendered with SVG.