# Connecting SAPRC07TC POA emission to POC

**URL:** <https://forum.cmascenter.org/t/connecting-saprc07tc-poa-emission-to-poc/5930>\
**Category:** DESID\
**Created:** [July 21, 2025, 10:35pm UTC](https://forum.cmascenter.org/t/connecting-saprc07tc-poa-emission-to-poc/5930 "2025-07-21T22:35:04Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ganghan2000](https://avatars.discourse-cdn.com/v4/letter/g/e9bcb4/32.png) [@ganghan2000](https://forum.cmascenter.org/u/ganghan2000)\
**Post date:** [July 21, 2025, 10:35pm UTC](https://forum.cmascenter.org/t/connecting-saprc07tc-poa-emission-to-poc/5930/1 "2025-07-21T22:35:04Z")

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Hello,

I’m trying to connect SAPRC07TC’s POA emission to CMAQ.  
CMAQ has two POA variables, which are POC and PNCOM, and I modified CMAQ\_Control\_DESID\_MECH.nml as below.

Adding  
‘EVERYWHERE’, ‘ALL’ ,‘POA’ ,‘APOC’ ,‘FINE’,1. ,‘MASS’,‘a’,

However, when I try to run the CMAQ, it consistently shows that POA emission is an unused variable, which is not connected to the CMAQ.

Is there any method to connect POA to CMAQ POC?

Sincerely,  
Ganghan

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<div class="post-metadata">

**Author:** ![ganghan2000](https://avatars.discourse-cdn.com/v4/letter/g/e9bcb4/32.png) [@ganghan2000](https://forum.cmascenter.org/u/ganghan2000)\
**Post date:** [July 22, 2025, 6:38pm UTC](https://forum.cmascenter.org/t/connecting-saprc07tc-poa-emission-to-poc/5930/2 "2025-07-22T18:38:51Z")

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I found the reason why POA emission conflicts with the newly added POA variable in CMAQ. I changed the CMAQ variable name, and the problem was solved.