# Secondary PM source apportionment by CMAQ-ISAM

**URL:** <https://forum.cmascenter.org/t/secondary-pm-source-apportionment-by-cmaq-isam/2807>\
**Category:** CMAQ-ISAM\
**Tags:** admin, cmaq\
**Created:** [November 10, 2021, 10:16pm UTC](https://forum.cmascenter.org/t/secondary-pm-source-apportionment-by-cmaq-isam/2807 "2021-11-10T22:16:16Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Ryan](https://avatars.discourse-cdn.com/v4/letter/r/a8b319/32.png) [@Ryan](https://forum.cmascenter.org/u/Ryan)\
**Post date:** [November 10, 2021, 10:16pm UTC](https://forum.cmascenter.org/t/secondary-pm-source-apportionment-by-cmaq-isam/2807/1 "2021-11-10T22:16:16Z")

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Hi all,  
I am posting this for asking whether **secondary PM** source apportionment is available by CMAQ-ISAM yet. Upon checking the CMAQ ISAM tutorial on Github, I think the current CMAQ-ISAM only supports source apportionment for ozone and secondary inorganic PM while **secondary organic PM is not supported**.  
Any clarification would be helpful.

Cheers,  
Ryan

@Ben_Murphy @lizadams

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**Author:** ![Ryan](https://avatars.discourse-cdn.com/v4/letter/r/a8b319/32.png) [@Ryan](https://forum.cmascenter.org/u/Ryan)\
**Post date:** [November 17, 2021, 8:26am UTC](https://forum.cmascenter.org/t/secondary-pm-source-apportionment-by-cmaq-isam/2807/2 "2021-11-17T08:26:30Z")

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@Ben_Murphy @lizadams

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**Author:** ![sergey](https://avatars.discourse-cdn.com/v4/letter/s/9fc348/32.png) [@sergey](https://forum.cmascenter.org/u/sergey)\
**Post date:** [November 18, 2021, 4:34pm UTC](https://forum.cmascenter.org/t/secondary-pm-source-apportionment-by-cmaq-isam/2807/3 "2021-11-18T16:34:02Z")

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Hi Ryan,

Secondary PM source apportionment is planned for release in the next major CMAQ version, which should be sometime next summer (subject to change!) We may have beta version of the code available ahead of the official release.

Sergey