# PM2.5 algorithms

**URL:** <https://community.purpleair.com/t/pm2-5-algorithms/3972>\
**Category:** Data\
**Created:** [March 22, 2023, 10:06pm UTC](https://community.purpleair.com/t/pm2-5-algorithms/3972 "2023-03-22T22:06:32Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![dwhitemv](https://sea2.discourse-cdn.com/flex020/user_avatar/community.purpleair.com/dwhitemv/32/1508_2.png) [@dwhitemv](https://community.purpleair.com/u/dwhitemv)\
**Post date:** [March 27, 2023, 4:31am UTC](https://community.purpleair.com/t/pm2-5-algorithms/3972/3 "2023-03-27T04:31:06Z")

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EPA has spent a lot of time studying the Plantower conversion factors and how they apply to real-world PM2.5 measurements. You might start by reviewing the papers/presentations linked in the post below. The actual algorithms are proprietary to Plantower.

> [@How to get EPA purple map data](https://community.purpleair.com/t/how-to-get-epa-purple-map-data/1844/2):
>
> All data on the PurpleAir map comes from PurpleAir sensors. For help accessing sensor data through the API, you can view our guide here: [Making API Calls with the PurpleAir API](https://community.purpleair.com/t/making-api-calls-with-the-purpleair-api/180). The documentation is available here: [https://api.purpleair.com/](https://api.purpleair.com/). You can download data in both JSON and CSV format with the API.

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