Air quality data ← Knowledge Base Air quality forecast What is AirVisual Earth and how does it work? Access AirVisual's AQI, Air quality and pollution API My city's data is unavailable on the AirVisual map What determines the major cities ranking? What is the difference between China & US AQI; 美国空气质量指数和中国空气质量指数有什么区别？ What is AQI? AirVisual API timestamp - how does it work? AirVisual’s outdoor data seems to differ from other sources. Why is this? How can I access outdoor pollution data through AirVisual's air quality API? What is an air quality widget and how can I use one to display air quality information on my webpage? How is air quality data validated before publishing on the AirVisual platform? Why AirVisual and AirNow are showing different AQI numbers?