Weather — entry 005 of 31
AQICN
AQICN, the World Air Quality Index project, aggregates real-time and forecast air-quality readings from more than 11,000 monitoring stations in roughly 1,000 cities worldwide, covering pollutants like PM2.5, PM10, NO2, and ozone. It's a non-commercial research project rather than a typical commercial API - access is a free token, but resale or paid redistribution of the data is prohibited.
AuthenticationAPI KeySign up with the provider to obtain credentials.
HTTPSSupportedTraffic is encrypted in transit.
CORSEnabledCallable directly from browser JavaScript.
PricingFreeNo paid tier — free for the documented use case.
FormatsJSONResponses can be requested as JSON.
GreatAPIs Score
Score78
Authentication15/25API key required
Pricing20/20Free to use
Docs14/20Documentation URL provided
Formats9/15Single response format
Freshness20/20Verified within 6 months
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<a href="https://greatapis.com/api/aqicn/"><img src="https://greatapis.com/badge/aqicn.svg" alt="Scored 78 on greatapis.com"></a>Auth quickstart
- Sign up with the provider to get an API key.
- Send it on every request as a header
Authorization: <key> - The exact header isn't documented — Authorization is a common default; confirm in the provider's docs.
Stored keyNo key stored
Your key is stored only in this browser (localStorage) and sent directly to the API — never to greatapis.