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  1. World Air Quality Historical Database - aqicn.org

  2. Air Data: Air Quality Data Collected at Outdoor Monitors Across …

  3. World Air Quality Historical Database - aqicn.info

  4. Air Quality Index Report | US EPA - U.S. Environmental …

  5. Historical Air Quality Trends Reports | US EPA - U.S.

  6. The Air Quality Index (AQI) in historical and analytical …

  7. World Air Quality Index (AQI) Ranking | IQAir

  8. WHO Ambient Air quality database - World Health Organization

  9. AQ Details - Historical Data - South Coast Air Quality

  10. History of Air quality index in Timeline - populartimelines.com