AirNow

Blocked at the source-contract and governance gate on 30 August 2026. Do not enable an unofficial endpoint as a substitute.

Official reportingarea.dat and cityzipcodes.csv were reviewed on 30 August 2026. They avoid retiring coordinate services, but cannot satisfy the approved stable-code identity and governance design without an approved AirNow account. No centroid fallback or unpublished API contract was implemented.