AQICN

API

Free Air Quality Index (AQI) Data API for 1000+ Cities

Overview

The AQICN API provides real-time and historical air quality data, including Air Quality Index (AQI) values and pollutant metrics (PM2.5, PM10, NO2, SO2, CO) for over 1000 cities globally. Key endpoints support city-specific queries (by name/ID), geolocation-based retrieval (latitude/longitude), and historical trend access. Responses are in JSON format, ideal for integrating into weather apps, health monitoring tools, environmental research platforms, or smart city solutions to alert users of poor air quality conditions.

Example Integration (JavaScript)

script.js JS


fetch('https://aqicn.org/api/')
  .then(res => res.json())
  .then(data => console.log(data))
  .catch(err => console.error(err));

Key Features

RESTful API
JSON Response Format
Real-time AQI Data
Geo-location Support
1000+ Cities Coverage
Historical Air Quality Trends

Frequently Asked Questions

? Is AQICN API free to use?

Yes, it offers a free tier with limited requests per minute/day. Paid plans are available for higher usage and advanced features like extended historical data access.

? Does it require an API Key?

Yes, you need to register on the AQICN website to obtain an API key for authenticating your requests.

? What is the response format?

The API returns data in JSON format, including AQI values, pollutant concentrations (PM2.5, PM10, NO2, etc.), location details, and timestamp information.

Top Alternatives

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OpenWeatherMap Air Pollution API Search Google

EPA Air Quality API Search Google

Tool Info

Pricing Freemium

Category Weather

Platform Public API

Pros

⊕ Easy to Integrate
⊕ Free Tier Accessible
⊕ Comprehensive Pollutant Metrics
⊕ Global City Coverage

Cons

⊖ Rate-limited Free Tier
⊖ Requires API Key
⊖ No SLA for Free Users
⊖ Limited Historical Data in Basic Plan