Air quality data, everywhere

Open air quality measurements for developers, researchers, AI agents and connected devices. The map, the Data Hub, the API and the files follow one methodology.

305 cities in 44 countries · daily history since 2017 · 25 languages

Build with API

Air quality now, daily history since 2017, monthly history, forecast and rankings. Read-only, no key.

Connect AI

An MCP server for Claude, ChatGPT, Cursor and other assistants.

Embed a widget

A live air quality card for your site in 25 languages.

Explore open data

Daily PM2.5 of every city since 2017 as CSV under the ODbL.