This example shows an area chart comparing pollutant levels across three Texas locations—Denton, Frisco, and Lewisville—over time. It loads JSON data from a GitHub Gist and uses D3 v7’s `d3.scalePoint` and `d3.scaleLinear` to map time and values, with `d3.area` generating the layered paths. Each location receives a semi-transparent color, and the chart includes rotated X-axis labels, a Y-axis, and a color-coded legend. The SVG is rendered directly into the DOM via `d3.select().append()`.