# How does CMAQ deal with S(IV)-S(VI) transformation and sulfuric chemistry?
**URL:** https://forum.cmascenter.org/t/how-does-cmaq-deal-with-s-iv-s-vi-transformation-and-sulfuric-chemistry/5547
**Category:** CMAQ
**Created:** [January 24, 2025, 3:51am UTC](https://forum.cmascenter.org/t/how-does-cmaq-deal-with-s-iv-s-vi-transformation-and-sulfuric-chemistry/5547 "2025-01-24T03:51:03Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@LYM](https://forum.cmascenter.org/u/LYM)
#### Post date: [January 24, 2025, 3:51am UTC](https://forum.cmascenter.org/t/how-does-cmaq-deal-with-s-iv-s-vi-transformation-and-sulfuric-chemistry/5547/1 "2025-01-24T03:51:03Z")
Dear all,
I am working on some applications related to S(IV)-S(VI) transformation and sulfuric chemistry. I checked the codes in CMAQ Cloud module (acm\_ae6) and could find the description of the processes. I am wondering that except the cloud module, whether S(IV)-S(VI) transformation is also described in Aerosol module or elsewhere in CMAQ?
Thank you very much for your help!
Best wishes,
Lingyun
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### Author:  [@slfarrell](https://forum.cmascenter.org/u/slfarrell)
#### Post date: [February 4, 2025, 4:36pm UTC](https://forum.cmascenter.org/t/how-does-cmaq-deal-with-s-iv-s-vi-transformation-and-sulfuric-chemistry/5547/2 "2025-02-04T16:36:46Z")
Hi Lingyun,
Great question! S(IV) to S(VI) conversion in the latest CMAQ version (v5.5) only includes aqueous reactions in the cloud module. We do plan to implement aerosol-phase S(IV) to S(VI) in CRACMM3 in CMAQv6. Stay tuned!
-Sara
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### Author:  [@LYM](https://forum.cmascenter.org/u/LYM)
#### Post date: [February 6, 2025, 3:09pm UTC](https://forum.cmascenter.org/t/how-does-cmaq-deal-with-s-iv-s-vi-transformation-and-sulfuric-chemistry/5547/3 "2025-02-06T15:09:16Z")
Hi Sara,
Thank you very much for your reply. I will keep an eye on it! Hope your work goes well!
All the best,
Lingyun