{"version":"1.0","type":"rich","title":"USA pm25 pollotion","description":"This interactive choropleth map displays PM2.5 pollution concentrations across US counties from 2018 to 2021. A sequential color scale using d3.interpolateReds shades counties, with a slider and play button animating through years. Built with React and d3-array, the visualization uses d3.geoPath and geoIdentity projection to render county boundaries from US Atlas TopoJSON data. A color legend with a linear gradient shows the concentration scale, and hovering reveals county names and values via SVG titles.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/0cda5f936443471985fbcca6f37f7095?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}