This interactive scatter plot visualizes the relationship between temperature (T) and relative humidity (RH) from the UCI Air Quality dataset, rendering thousands of overlapping semi-transparent points to reveal density patterns. Built entirely with the Vega-Lite API, the visualization uses `vl.markCircle` and encodes quantitative axes with configurable scales. The code imports data via D3's `csv` method, then renders the chart using Vega and Vega-Lite engines with an SVG renderer and tooltip support, while custom configuration adjusts axis styling and typography for readability.