World Air Quality Index (WAQI)

The World Air Quality Index (WAQI) REST API provides real-time air quality data, AQI readings, pollutant measurements, and station data for more than 12,000 monitoring stations worldwide. The API delivers city-level and station-level air quality index values for pollutants including PM2.5, PM10, NO2, CO, SO2, and Ozone, along with geo-location queries, weather conditions, and 3-8 day forecast data. Access is free for non-commercial use and requires a token obtained from the Air Quality Open Data Platform.

World Air Quality Index (WAQI) publishes 3 APIs on the APIs.io network: Feed API, Map API, and Search API. Tagged areas include Air Quality, AQI, Environment, Pollution, and Real-Time Data.

The World Air Quality Index (WAQI) catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

World Air Quality Index (WAQI)’s developer surface includes authentication, documentation, pricing, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub

41.9/100 developing ▬ flat Agent 50/100 agent native Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0

AccessFreemiumSelf serve⚡ Free to try

3 APIs

Air QualityAQIEnvironmentPollutionReal-Time DataWeatherIoTOpen Data

Kin Score

Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0

Composite quality — 41.9/100 · developing

Contract Quality 13.8 / 21

Developer Ergonomics 3.6 / 17

Access Clarity 6.7 / 17

Operational Transparency 2.9 / 11

Contract Governance 1.0 / 10

Discoverability 6.3 / 9

Regulatory Posture 4.7 / 15

Agent readiness — 50/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 4 / 4

Regulatory Posture applies to this provider. Its tags matched the Government & Public Sector regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/waqi: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 3

Individual APIs this provider publishes, each with its own machine-readable definition.

Rate Limits 1

Documented rate limits and quota policies.

Waqi Rate Limits

2 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

WAQI Feed Response

2 properties

JSON SCHEMA

Examples 3

Example request and response payloads for these APIs.

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrg

GitHubOrg

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 2

The organization behind the API

Website

Website

Website

Website

Source (apis.yml)

aid: waqi
name: World Air Quality Index (WAQI)
description: 'The World Air Quality Index (WAQI) REST API provides real-time air quality data, AQI readings, pollutant measurements,
  and station data for more than 12,000 monitoring stations worldwide. The API delivers city-level and station-level air quality
  index values for pollutants including PM2.5, PM10, NO2, CO, SO2, and Ozone, along with geo-location queries, weather conditions,
  and 3-8 day forecast data. Access is free for non-commercial use and requires a token obtained from the Air Quality Open
  Data Platform.

  '
type: Index
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/waqi.png
url: https://raw.githubusercontent.com/api-evangelist/waqi/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.23'
tags:
- Air Quality
- AQI
- Environment
- Pollution
- Real-Time Data
- Weather
- IoT
- Open Data
apis:
- aid: waqi:waqi-feed-api
  name: World Air Quality Index (WAQI) Feed API
  description: Air quality feed endpoints for city, geo, and IP-based queries
  humanURL: https://aqicn.org/api/
  baseURL: https://api.waqi.info
  tags:
  - Feed
  properties:
  - type: OpenAPI
    url: openapi/waqi-feed-api-openapi.yml
  - type: Documentation
    url: https://aqicn.org/json-api/doc/
  - type: Authentication
    url: https://aqicn.org/data-platform/token/
- aid: waqi:waqi-map-api
  name: World Air Quality Index (WAQI) Map API
  description: Map tile and station boundary queries
  humanURL: https://aqicn.org/api/
  baseURL: https://api.waqi.info
  tags:
  - Map
  properties:
  - type: OpenAPI
    url: openapi/waqi-map-api-openapi.yml
  - type: Documentation
    url: https://aqicn.org/json-api/doc/
  - type: Authentication
    url: https://aqicn.org/data-platform/token/
- aid: waqi:waqi-search-api
  name: World Air Quality Index (WAQI) Search API
  description: Search for monitoring stations by keyword
  humanURL: https://aqicn.org/api/
  baseURL: https://api.waqi.info
  tags:
  - Search
  properties:
  - type: OpenAPI
    url: openapi/waqi-search-api-openapi.yml
  - type: Documentation
    url: https://aqicn.org/json-api/doc/
  - type: Authentication
    url: https://aqicn.org/data-platform/token/
common:
- type: AgenticAccess
  url: agentic-access/waqi-agentic-access.yml
- type: DomainSecurity
  url: security/waqi-domain-security.yml
- type: Authentication
  url: authentication/waqi-authentication.yml
- type: Website
  url: https://waqi.info/
- type: Website
  url: https://aqicn.org/
- type: Documentation
  url: https://aqicn.org/json-api/doc/
- type: GitHubOrg
  url: https://github.com/waqi-dev-community
- type: Pricing
  url: https://aqicn.org/api/
- type: Plans
  url: plans/waqi-plans-pricing.yml
- type: RateLimits
  url: rate-limits/waqi-rate-limits.yml
- type: FinOps
  url: finops/waqi-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com