Why is your air quality index different from other sites?

Our AQI is calculated hourly and updated hourly. Many other websites calculate in different time intervals.
For example, NowCast is a 12-hour average that adjusts based on a weight factor. It's important to understand the basis of other air quality data calculations to compare apples to apples.

For more information on data differences you can click the link below:
https://www.iqair.com/us/newsroom/airvisual-s-outdoor-data-seems-to-differ-from-other-sources-why-is-this