A pie chart displays the top 10 countries by deaths from air pollution in 2020, using D3 v5 to fetch CSV data and render SVG arcs. The chart uses `d3.pie` and `d3.arc` to generate segments, `d3.scaleOrdinal` for color mapping, and `d3.format` to abbreviate values like “1.2K”. Legends show country names with corresponding values, and a title is centered above the visualization.