AQICN / World Air Quality Index API

aqicn.org

Provides programmatic access to real-time air quality index and pollutant data for over 11,000 monitoring stations and 1,000 cities worldwide.

The AQICN / World Air Quality Index API API uses api key authentication; has free pricing; offers a free tier (All APIs provided for free with a valid token; default quota 1,000 requests per second); rate limits: Default quota of 1,000 requests per second. Verified 2026-07-12 with per-field source links.

Weather Verified 2026-07-12 high confidence

Base URL

http://api.waqi.info/

aqicn.org ↗

Auth

api_key

aqicn.org ↗

Free tier

All APIs provided for free with a valid token; default quota 1,000 requests per second

aqicn.org ↗

Pricing model

free

aqicn.org ↗

Pricing

All APIs are free; data cannot be sold, used in paid applications, or redistributed; commercial use requires explicit agreement

aqicn.org ↗

Rate limits

Default quota of 1,000 requests per second

aqicn.org ↗

OpenAPI spec

not documented null

no source

MCP server

not documented null

no source