# Data conversion

**URL:** <https://forum.ecmwf.int/t/data-conversion/861>\
**Category:** Other - Datasets and Usage\
**Tags:** ghg, c3s, conversion\
**Created:** [13 September 2020 17:58 UTC](https://forum.ecmwf.int/t/data-conversion/861 "2020-09-13T17:58:29Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![LYDCBruce\_Hyman](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/l/73ab20/32.png) [@LYDCBruce\_Hyman](https://forum.ecmwf.int/u/LYDCBruce_Hyman)\
**Post date:** [13 September 2020 17:58 UTC](https://forum.ecmwf.int/t/data-conversion/861/1 "2020-09-13T17:58:29Z")

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Hello, is there any way to convert reported Carbon Monoxide data (shown in maps as "total column of Carbon Monoxide&nbsp;[10^18 molecules/cm2] to ground level ppm, since ground level toxicity is of some health importance? thank you in advance, and apologies of this is a naive question.&nbsp;