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Two Decades of Pollution in US
This visualization shows PM2.5 pollution across US counties for the year 2000, using a choropleth map colored by concentration levels. It builds the map with vega-lite-api, joining county GeoJSON topojson data with a PM2.5 CSV dataset via a lookup transform. The visualization uses an Albers USA projection, encodes the pollution values on a clamped color scale, and renders tooltips showing exact concentrations. It integrates D3 version 5 and React for the interface setup.
AI-generated descriptionThe source dataset of this visualization is PM2.5 by County. It shows the changes of pm2.5 concentration of the US of 2000.
Each region block represents the pm2.5 concentration of the county.