OpenAQ
OpenAQ API v3
Global air-quality observations
Original pollutant readings from government and institutional monitors, hourly-to-yearly aggregations, coordinates, coverage metrics, providers, and license records.
“Which neighborhoods in the same city are breathing fundamentally different air?”
Provider-dependent · often hourly
Public monitoring stations worldwide · multiple pollutants
Free account / API key · no-login AWS archive
Original-provider licenses; license records available via API
JSON · REST API · CSV.GZ · S3
Original-provider licenses vary; the OpenAQ API licenses resource records the applicable terms
Credit OpenAQ and follow the selected station or provider's original-source attribution requirements.
Query locations, providers, and licenses before publishing; verify commercial, modification, and redistribution rights plus late-arriving data and coverage—latest is not a complete series.