This example shows hourly temperature readings for seven cities over one week in 2015, with each city drawn as a distinct colored line in a single chart. The visualization uses Vega-Lite to generate the line chart from CSV data, which is loaded via d3.csv, and re-renders responsively on window resize using vegaEmbed. The data comes from the now-defunct Sense Your City project, filtered to include temperature, light, air quality, sound, humidity, and dust metrics, though only temperature is displayed here. The mark type is line with a stroke width of five, and lines use multiply blending to handle overlaps.