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OpenAQ v3

Environment & Climate Free key (no card)

AuthenticationFree key (no card)
Rate limitFree tier with a generous daily quota (community sources cite 10,000 requests/day)

Documentation: docs.openaq.org ยท Checked Sep 13, 2026

About

The open air-quality platform aggregating measurements from thousands of stations in over 100 countries. Version 3 of the API requires a free API key on every request (v1/v2 were retired in 2025). Register with just an email. No card.

Details

Free to start. You may need a free key, but no credit card.

Auth: Free key (no card)

Rate limit: Free tier with a generous daily quota (community sources cite 10,000 requests/day)

Verified: 2026-09-13

Best for: health apps city dashboards researchers

Read the docs Back to catalog

Setup

  1. Register at explore.openaq.org with your email
  2. Copy your API key from the dashboard
  3. Send it as the X-API-Key header on every request
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