This bar graph displays the Air Quality Index (AQI) values for various pollutants in Maine, with each pollutant represented as a horizontal bar whose length corresponds to its AQI measurement. The visualization uses React with D3 v5, employing `scaleBand` for the categorical y-axis and `scaleLinear` for the continuous x-axis. SVG rectangles are rendered for each bar, with axes created through custom `AxisBottom` and `AxisLeft` components. The data is loaded asynchronously from a CSV file using D3’s `csv` function, and hovering over a bar reveals its exact AQI value via a tooltip.