AQICN vs National Grid ESO
Same instrument, two spec sheets — measured, not claimed.
AQICN vs National Grid ESO: common questions
Which is more reliable, AQICN or National Grid ESO?
Both are neck-and-neck — AQICN and National Grid ESO each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.
Which is faster, AQICN or National Grid ESO?
AQICN has the lower median latency in our checks — AQICN responds in 224 ms versus National Grid ESO at 609 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.
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.