# CMAQ v5.4.0.4 HDDM-sensitivity output error

**URL:** <https://forum.cmascenter.org/t/cmaq-v5-4-0-4-hddm-sensitivity-output-error/5205>\
**Category:** CMAQ-DDM-3D\
**Tags:** ddm\
**Created:** [September 11, 2024, 1:54am UTC](https://forum.cmascenter.org/t/cmaq-v5-4-0-4-hddm-sensitivity-output-error/5205 "2024-09-11T01:54:24Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![hyos](https://avatars.discourse-cdn.com/v4/letter/h/e68b1a/32.png) [@hyos](https://forum.cmascenter.org/u/hyos)\
**Post date:** [September 11, 2024, 1:54am UTC](https://forum.cmascenter.org/t/cmaq-v5-4-0-4-hddm-sensitivity-output-error/5205/1 "2024-09-11T01:54:24Z")

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Hello, I am using CMAQ-v5.4.0.4 and I want to check the sensitivity of NOx and VOCs using HDDM.  
However, on any day during the simulation period, sensitivity increases rapidly outside of DDM-REGION, and suddenly a white blank area is created, which grows larger and eventually the entire domain changes to infinity.  
These results usually occur frequently in summer simulation (July to August) and seem to be more common in NOx sensitivity results. right?  
In addition to CMAQ-v5.4.0.4, I used v5.4, v5.2, etc., but they all have the same results, and I’m trying to simulate by adjusting MAXSYNC(300~720) and ADV\_CFL(0.75~0.95), but eventually the same problem comes up on different days.  
I would appreciate it if you could let me know if there is anything I will review.  
thank you.

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**Author:** ![cgnolte](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.cmascenter.org/cgnolte/32/53_2.png) [@cgnolte](https://forum.cmascenter.org/u/cgnolte)\
**Post date:** [September 11, 2024, 4:29pm UTC](https://forum.cmascenter.org/t/cmaq-v5-4-0-4-hddm-sensitivity-output-error/5205/2 "2024-09-11T16:29:25Z")

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Are you using one of our sample DDM sensitivity input files, or one you constructed yourself?

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<div class="post-metadata">

**Author:** ![hyos](https://avatars.discourse-cdn.com/v4/letter/h/e68b1a/32.png) [@hyos](https://forum.cmascenter.org/u/hyos)\
**Post date:** [September 13, 2024, 1:42am UTC](https://forum.cmascenter.org/t/cmaq-v5-4-0-4-hddm-sensitivity-output-error/5205/3 "2024-09-13T01:42:37Z")

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Do you mean the sample input file is sensinput.dat file? If it is correct, I rewrited species and region that I wanted. Below is what I wrote in sensinput.dat.

ENX  
EMIS  
TOTA  
SPECIES  
NO, NO2  
REGION  
R2

EVC  
EMIS  
TOTA  
SPECIES  
TERP, ISOPRENE, MEOH, ACETONE, CCHO, HCOOH, HCHO, CCOOH, BALD, MEK, RCOOH, RCHO, CRES, GLY, MGLY, PRD2, ETHENE, ARO1, OLE1, OLE2, ALK1, ALK2, ALK3, ALK4, ALK5  
REGION  
R2

2NX  
HIGH  
ENX  
ENX

2VC  
HIGH  
EVC  
EVC

CNV  
EMIS  
TOTA  
SPECIES  
NO, NO2, TERP, ISOPRENE, MEOH, ACETONE, CCHO, HCOOH, HCHO, CCOOH, BALD, MEK, RCOOH, RCHO, CRES, GLY, MGLY, PRD2, ETHENE, ARO1, OLE1, OLE2, ALK1, ALK2, ALK3, ALK4, ALK5  
REGION  
R2

END

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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:** [October 29, 2024, 5:07pm UTC](https://forum.cmascenter.org/t/cmaq-v5-4-0-4-hddm-sensitivity-output-error/5205/4 "2024-10-29T17:07:37Z")

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Hello,

Have you tried the latest 5.4 version? The 5.4+ branch specifically addressed some DDM-3D output issues. We have also recently moved to version 5.5 that might be worth trying. If none of these resolve your issues, please, let me know and I will try to recreate it locally.

> **[CMAQ Bugfix Branch](https://github.com/USEPA/CMAQ/wiki/CMAQ-Bugfix-Branch#record-of-changes-to-cmaqv54)**
>
> Code for U.S. EPA’s Community Multiscale Air Quality Model (CMAQ) which helps in conducting air quality model simulations - USEPA/CMAQ

Sergey