This area chart visualizes the monthly trend of average AQI values, with a teal filled area beneath the line and labeled data points. Built with D3 v7, it loads a CSV dataset from a GitHub gist, parses month names using `d3.timeParse`, and renders the chart as an SVG. The visualization uses a `d3.area` generator to create the shaded region, with time-based x-scale via `d3.scaleTime` and linear y-scale via `d3.scaleLinear`, plus axes from `d3.axisBottom` and `d3.axisLeft`.