This visualization displays the Air Quality Index (AQI) forecast for Beijing over a 24-hour period, showing a clear upward trend. The line chart, rendered as an SVG using D3 v5, maps timestamps on the x-axis and AQI values on the y-axis. The code uses `d3.scaleTime` and `d3.scaleLinear` for axis scaling, `d3.line` with `curveBasis` for a smooth line, and `axisBottom` and `axisLeft` for tick marks. Data is loaded from a local CSV file.