This D3.js pie chart visualizes deaths in 2020 caused by air pollution, aggregated by country. The SVG canvas renders each country’s death count as a colored slice with a value label, while a legend pairs each color with its country and corresponding figure. The visualization uses the `d3.pie` layout, `d3.arc` for generating sector paths, and `d3.scaleOrdinal` to assign colors. Data is loaded asynchronously from a CSV file via the `d3.csv` loader, and formatting is handled with `d3.format`.