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AQICN vs National Grid ESO

Same instrument, two spec sheets — measured, not claimed.

APIAQICNREACHABLE—National Grid ESONEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSnoyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedNESO Open Data Licence (OGL-based); varies per dataset
Free tierFree tier — API key requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

AQICN vs National Grid ESO: common questions

Which is more reliable, AQICN or National Grid ESO?

On our scheduled checks, National Grid ESO leads on measured uptime — AQICN at —% versus National Grid ESO at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do AQICN and National Grid ESO need an API key?

National Grid ESO needs no key, while AQICN requires a free API key. If you want to start calling without signup, reach for National Grid ESO first.

Can I call AQICN and National Grid ESO from the browser?

Only National Grid ESO is browser-friendly — it returns CORS headers over HTTPS. AQICN needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are AQICN and National Grid ESO free for commercial use?

AQICN has unclear commercial terms, and National Grid ESO has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.