OpenAQ is the world’s largest free and open-source platform for ground-level ambient air quality data. To gather and harmonize the world’s air quality data, OpenAQ searches and scrapes hundreds of data sources to extract and store data. OpenAQ gathers physical measurements, not aggregated values such as AQIs (Air Quality Indexes).

Open Source

OpenAQ is proudly open source and built on open source technology. View OpenAQ’s open-source code on github .

Accessing Data

API

For programmatic users, the best way to access data on the OpenAQ platform is through the OpenAQ REST API. The API allows programmatic and queryable access to the OpenAQ database.

To learn more about how to use the OpenAQ API to query data visit docs.openaq.org .

OpenAQ Explorer

The OpenAQ Explorer is an interactive web application that makes exploring the OpenAQ database easy.

Visit the OpenAQ Explorer at https://explore.openaq.org .