{"version":"1.0","type":"rich","title":"Fork of PM 2.5 Particle Change in US","description":"This interactive choropleth map visualizes PM2.5 particle concentration changes across US counties from 2000 to 2018. A slider, oriented vertically on the left with auto-play, lets users scrub through the years, revealing shifting pollution hotspots. Each county polygon is filled using a `d3.scaleSequential` with `interpolateYlGnBu` color scale, where darker blues represent higher concentrations. Built with React and D3 v5, it uses `d3.geoPath` with an Albers projection on topojson data, and includes a gradient legend with tick marks for reference.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/393c77cfc50c467f9d9e85f88ca788f5?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}