This interactive scatter plot lets users explore air quality data from CSV files for the years 2016 through 2019. Users can select which columns (e.g., Raw.Conc., pressure, air_temp) map to the X and Y axes, as well as the year, via dropdown menus built with a custom `dropdownMenu` module. The visualization uses Chart.js to render the scatter plot on a Canvas element, while D3.js handles the dropdown interface and CSV data loading via `fetch`.