This scatter plot matrix shows the relationships between air quality (AQI), temperature, and municipal greenhouse gas emissions in San Francisco across fiscal years 2020–2022. Color-coded points for each year visualize correlations between all variable pairs in a grid of small multiples. Built with D3 v7, the visualization uses `d3.csv` for data loading, `d3.rollup` to aggregate emissions data, and `d3.scaleLinear` for axis scales. The SVG rendering applies a categorical color scale via `d3.scaleOrdinal` and draws circles with SVG paths.