Coverage index

City pages per market

Embed this chart: <iframe src="/datasets/coverage-index/embed" width="100%" height="420" loading="lazy"></iframe>

The data

Download and API

• coverage-index.csv — 35 rows, comma separated.
• coverage-index.json — rows plus the field schema, methodology, and version. Stable URL, same origin, no key required.
• index.json — the catalogue of every dataset, for programmatic discovery.

Licence. CC BY 4.0 — reuse with attribution to Radon Connect and a link to the dataset page.

Field schema

Methodology

The question this answers

Where does this platform actually publish, and at what depth?

How a row comes to exist

• Generated at build time from the market registry that drives routing, the sitemap, and the ZIP resolver.
• Territory counts are the county-level routing units used to match a request to a contractor.

Inclusion and exclusion

• Active markets only. Inactive configuration placeholders are excluded.

What this dataset cannot tell you

• Coverage describes where we publish and route, not where radon is prevalent. Nothing here should be read as a risk map.
• A market appearing here does not guarantee contractor availability for a given address at a given time.

Related

• State Radon Regulatory Index — Ten states, one table: regime, agency, disclosure mechanism, and what is actually required.
• State certification differences — Licensed states, certification states, and what to verify in each.
• Research Center — every dataset, with its provenance and status.
• Research methodology — how this platform builds and checks content.