Fork of map of epa data sites

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Fork of map of epa data sites

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Last edited Dec 3, 2022

Created on Dec 3, 2022

This visualization displays EPA air quality monitoring sites across the contiguous United States, with each site represented by a circle positioned according to its recorded latitude and longitude. The map overlays these data points on a geographic outline of US states, rendered using the `geoAlbersUsa` projection and `geoPath` from d3-geo, with state boundaries and interior borders drawn from TopoJSON data. Circle positions are projected through the same geo projection, and while the code includes a `scaleSqrt` for sizing by AQI values, the rendered circles use a fixed radius of 5 pixels. The visualization is built with React and d3.v5, loading CSV data via d3-fetch and US state geometries from the us-atlas TopoJSON file.

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