This donut chart visualizes the top 10 countries by deaths in 2020 due to air pollution, with each slice labeled with its value in thousands. The chart uses a D3 pie layout (`d3.pie`) and `d3.arc` to generate the segments, while a legend maps slice colors to country names. The data is fetched from a CSV file and rendered as an SVG, with colors assigned via `d3.scaleOrdinal`.