Data
Radon411 data
Every number on the site comes from a named public agency. Explore it county by county, see what each term means, and see how much of the country it covers.
Coverage
How much of the country the data covers today
- 56
- States and territories, from Census boundaries
- 3,231
- Counties, with real Census geometry and FIPS codes
- 3,138
- Counties with an EPA zone, of 3,231
- 2,862
- Counties with CDC testing data, of 3,231
Four ways in
Explore the data
Data explorer
Every U.S. county, one row each. Filter by state, EPA zone, USGS potential and testing data; sort and page through it; every view is a link.OpenData dictionary
What every term and column means, in plain words and technically.OpenSources
Every source behind the numbers and the guides, by name, grouped by what it feeds, with a date for each.OpenMethodology
What Predicted, Measured and Calculated mean, how each calculated figure is worked out, and how often the data is refreshed.Open
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