{"version":"1.0","type":"rich","title":"more chloropleth","description":"This interactive choropleth maps fine particulate matter (PM2.5) concentrations across U.S. counties from 2000 to 2021, with a slider and play button animating through years. Each county’s fill color transitions smoothly via `scaleSequential` and `interpolateYlGnBu`, while hovering reveals state and value details. Built with React and D3 v5, it uses `geoIdentity` with `geoPath`, TopoJSON from the us-atlas library, and CSV data fetched via `d3.csv`, rendering SVG paths that update with `transition` styling.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/0cea1577fb7d4d558e28ceaa14cc9528?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}