{"version":"1.0","type":"rich","title":"Fork of PM 2.5 Particle Change in US_test","description":"This animated choropleth map visualizes changes in PM2.5 particle concentrations across U.S. counties from 2000 to 2018. Users can scrub through years via a vertical slider or trigger automatic playback, with color intensity reflecting pollution levels via a d3.interpolateYlGnBu sequential scale. Built with React and D3 v5, the SVG map uses d3.geoPath with a geoIdentity projection for county boundaries, while a ColorLegend component renders a gradient bar with tick marks. The data is loaded via d3.csv, and each state’s border is highlighted on hover.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/fa56f6ac2ac140acaeca6fca7e4a63b9?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}