This example combines a bar graph and a line graph to compare Air Quality Index (AQI) values across different pollutants. The bar chart displays AQI values with tooltips, while the line chart overlays the same data points, both sharing the x-axis for AQI and y-axis for pollutant names. The visualization uses vega-lite-api, registering vega and vega-lite, and loads data from a CSV file via d3.csv. Custom axis and label styling is applied through a config object to improve readability.