# About purpleair average method

**URL:** <https://community.purpleair.com/t/about-purpleair-average-method/4071>\
**Category:** Data\
**Created:** [March 31, 2023, 2:00pm UTC](https://community.purpleair.com/t/about-purpleair-average-method/4071 "2023-03-31T14:00:38Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ke\_xu](https://avatars.discourse-cdn.com/v4/letter/k/7ea924/32.png) [@ke\_xu](https://community.purpleair.com/u/ke_xu)\
**Post date:** [March 31, 2023, 2:00pm UTC](https://community.purpleair.com/t/about-purpleair-average-method/4071/1 "2023-03-31T14:00:38Z")

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Hi, I am looking at the historical data, there is an average field, may I ask what is the procedure under it? For example, if I put 1440, is it averaged in the UTC time for each day? Or they are 24-hour windows ending with the timestamp I request? And are these simple averages without looking at the outliers? Thanks!