This pie chart visualization shows the top 10 countries by deaths attributed to air pollution in 2020, using data from a CSV file fetched via d3.csv. The chart displays each country's death toll as a labeled slice, with a legend listing country names and corresponding values. Built with D3 v5, the code uses d3.pie, d3.arc, and d3.scaleOrdinal to generate the SVG arcs, while d3.arc().centroid positions the labels. A legend is constructed with appended rectangles and text elements, and values are formatted using d3.format.