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AQICN vs US Weather

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

APIAQICNON SCHEDULE—US WeatherNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSnoyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedU.S. Government work / public domain
Free tierFree tier — API key requiredFree (US Government public data)
Rate limitUnpublishedUnpublished (asks for a User-Agent identifying your app)
In directory since2026-07-052026-07-05
operationalpartialdownno data

AQICN vs US Weather: common questions

Which is more reliable, AQICN or US Weather?

Only US Weather is on our probe schedule so far (—% uptime over 90 days). The other is catalogued but not yet live-checked, so we can't compare measured reliability head-to-head — check the uncovered API's own status page for now.

Do AQICN and US Weather need an API key?

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

Can I call AQICN and US Weather from the browser?

Only US Weather 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 US Weather free for commercial use?

AQICN has unclear commercial terms, and US Weather allows commercial use on its free tier. 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.