Validated releaseUpdated 2026-10-15See source status
Automated source ledger
Data freshness and coverage
A visible record of what passed, what is unavailable and whether the experimental ranking is publishable.
AirNow75/75current observations
EPA water75/75city records with state context
NOAA75/75valid stations
Census70/75exact place matches
Release decision
Validated public-data release. Current AQI is displayed separately and does not affect the long-term index.
What happens when a source fails?
The page displays “Unavailable” with a reason. The updater never substitutes invented values, never converts a source outage to zero and never ranks a city missing a weighted field. The scheduled publication job must pass the data validator before it can commit or deploy a new release.
Latest generation timestamp
2026-10-15T15:41:24+00:00