A pie chart visualizes the top 10 countries by deaths from air pollution in 2020, with each slice labeled with the death count and accompanied by a color-coded legend. The chart is built with D3 v5, using `d3.pie` and `d3.arc` to generate the slices and their centroids for labels. Data is fetched as CSV from a GitHub gist, and the chart is rendered as SVG inside an HTML page. Colors are assigned via `d3.scaleOrdinal` with a custom array of section colors.