This scatter plot displays the relationship between AQI values and NO2 AQI values across different countries, with each point colored by its country of origin and accompanied by a legend. The visualization uses D3.js v7 to load data from a CSV file hosted as a GitHub gist, then constructs an SVG chart with linear scales, axes, axis labels, and circles positioned via `d3.scaleLinear`. The code creates a scatter plot with `d3.csv`, `d3.axisBottom`, and `d3.axisLeft`, while styling points using a country-to-color mapping and adding a legend with SVG rectangles and text elements.