{"version":"1.0","type":"rich","title":"AQI in Different Cities","description":"The visualization displays Air Quality Index (AQI) values as a heatmap across different cities and timestamps, with color intensity reflecting pollution levels. Each rectangular cell encodes a city-time pair, and tooltips reveal exact AQI numbers on hover. The code uses the d3.csv API to load the AQI_2015.csv dataset, then constructs the graphic through the Vega-Lite API (vl.markRect) with fields mapped to the x-axis, y-axis, color scale, and tooltip. The resulting SVG renderer output is configured with custom axis styling and tooltip handling via vegaTooltip.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/3eca2a196be849db95add0f70c01d7b7?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}