# Convert the unit from molecules/m^2 to ppm

**URL:** https://forum.atmospherictoolbox.org/t/convert-the-unit-from-molecules-m-2-to-ppm/154
**Category:** Uncategorized
**Created:** [May 31, 2020, 7:49am UTC](https://forum.atmospherictoolbox.org/t/convert-the-unit-from-molecules-m-2-to-ppm/154 "2020-05-31T07:49:48Z")
**Posts on this page:** 1
**Showing post:** 2

<div class="post-metadata">

### Author: ![sander.niemeijer](https://forum.atmospherictoolbox.org/user_avatar/forum.atmospherictoolbox.org/sander.niemeijer/32/5_2.png) [@sander.niemeijer](https://forum.atmospherictoolbox.org/u/sander.niemeijer)
#### Post date: [May 31, 2020, 10:34am UTC](https://forum.atmospherictoolbox.org/t/convert-the-unit-from-molecules-m-2-to-ppm/154/2 "2020-05-31T10:34:56Z")

</div>

This is an inherent limitation of the way the satellite can measure the atmosphere. You won’t be able to retrieve parts of a vertical column. See also [this earlier comment](https://forum.atmospherictoolbox.org/t/map-sentinel-5p-ch4-so2-and-co-data-visan/45/22).  
The way the S5P NO2 L2 product is able to split a total column in a tropospheric and stratospheric column is already quite an achievement (and requires the use of an atmospheric model to achieve it).

---

_[View the full topic](https://forum.atmospherictoolbox.org/t/convert-the-unit-from-molecules-m-2-to-ppm/154)._