{"version":"1.0","type":"rich","title":"Pollution in US with counties with color legend","description":"This visualization displays PM2.5 concentration levels for US counties in the year 2000, with each county colored according to its pollution level. Counties without data appear in grey, while the color legend uses d3.interpolateYlGnBu to map concentration values. The map uses d3.geoPath with a geoIdentity projection fitted to US county boundary data from the US Atlas TopoJSON. The React-based implementation loads CSV data containing PM2.5 measurements and creates a Map for lookups, encoding values through a d3.scaleSequential color scale.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/075afc2238534197a958d3b5d0cb5c97?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}