# CAMS ozone mass mixing ratio partial column

**URL:** <https://forum.ecmwf.int/t/cams-ozone-mass-mixing-ratio-partial-column/2514>\
**Category:** CAMS - Datasets and Usage\
**Created:** [17 April 2024 16:12 UTC](https://forum.ecmwf.int/t/cams-ozone-mass-mixing-ratio-partial-column/2514 "2024-04-17T16:12:04Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Serena\_Di\_Pede](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/s/edb3f5/32.png) [@Serena\_Di\_Pede](https://forum.ecmwf.int/u/Serena_Di_Pede)\
**Post date:** [17 April 2024 16:12 UTC](https://forum.ecmwf.int/t/cams-ozone-mass-mixing-ratio-partial-column/2514/1 "2024-04-17T16:12:05Z")

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Dear ECMWF,

I would like to create ozone partial column using the CAMS ozone mass mixing ratio parameter. I integrated over the pressure levels ( 800hPa-400hPa) and I would like to convert this in DU.  
I guess that perhaps the correct procedure is to first convert the ozone MMR in mass concentration (kg/m3), then integrate, and then convert in DU.  
Is this the correct procedure?  
Thank you in advance!

Best regards,  
Serena