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Worldwide Air Pollution: Real-time Air Quality Index Visual Map

AQI at Aerostate.io  - Aerostate website about AQI real time data, forecasts, maps, analytics

EAQI - European Environment Agency

The UK Air Quality Archive

AQI at airnow.gov - cross-agency U.S. Government site

New Mexico Air Quality and API data - Example of how New Mexico Environment Department publishes their Air Quality and API data.

AQI at Meteorological Service of Canada

San Francisco Bay Area Spare-the-Air - AQI explanation