OpenAQ
Air-quality measurements by station and city
- Access
- Public air-quality API
- Cadence
- Hourly to daily
- License note
- Use source/provider metadata for imported measurements.
Sources
Transparent source catalogue
OpenStreetMap / Overpass
Global amenities, transport, hospitals, schools, parks
- Access
- Open geodata and Overpass API
- Cadence
- Continuous community updates
- License note
- ODbL attribution required for OSM-derived features.
UNData / UNSD
Population, demographics, migration, national indicators
- Access
- Public tables and downloadable datasets
- Cadence
- Annual and periodic
- License note
- Public statistical data; cite original UN series on production imports.
WHO Global Health Observatory
Health, life expectancy, risk factors
- Access
- Public health data portal
- Cadence
- Annual and periodic
- License note
- Use with WHO attribution and indicator metadata.
Wikidata
Place metadata, coordinates, population references
- Access
- SPARQL endpoint and dumps
- Cadence
- Continuous community updates
- License note
- CC0; preserve reference URLs where available.
World Bank Open Data
Countries and territories
- Access
- Free REST API and bulk downloads
- Cadence
- Monthly to annual by indicator
- License note
- Open data with source attribution; automated refreshes use the latest available country indicators.