This interactive horizon chart visualizes air pollution measurements across multiple monitoring stations, allowing users to explore data by month, pollutant type (PM2.5, PM10, NO2, O3, CO, SO2), color scheme, and the number of bands. Built with D3.js version 7, it uses the `d3.csv` loader for external data and renders SVG output. The implementation uses `d3.timeParse` for date handling, `d3.schemeBlues` and related sequential color schemes, and a custom `HorizonChart` function with configurable curves and margins. Users can dynamically filter categories and adjust band intensity through slider controls.