# Fail to generate the ASENS file in CMAQ-DDM V5.4

**URL:** <https://forum.cmascenter.org/t/fail-to-generate-the-asens-file-in-cmaq-ddm-v5-4/4005>\
**Category:** CMAQ-DDM-3D\
**Created:** [March 23, 2023, 11:12pm UTC](https://forum.cmascenter.org/t/fail-to-generate-the-asens-file-in-cmaq-ddm-v5-4/4005 "2023-03-23T23:12:50Z")\
**Posts on this page:** 3\
**Page:** 2

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**Author:** ![hogrefe.christian](https://avatars.discourse-cdn.com/v4/letter/h/74df32/32.png) [@hogrefe.christian](https://forum.cmascenter.org/u/hogrefe.christian)\
**Post date:** [September 19, 2024, 4:09pm UTC](https://forum.cmascenter.org/t/fail-to-generate-the-asens-file-in-cmaq-ddm-v5-4/4005/23 "2024-09-19T16:09:42Z")

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The definition of your first sensitivity parameter PPA is missing the required “sensitivity type” keyword (EMIS, INIT, BOUN, RATE, or HIGH) after “PPA” and before “SPECIES”.

> PPA  
> SPECIES  
> SO2

This is why the LOG file says " Sentype not recognized: SPECIES"

From the documentation included in the example file:

> (mandatory) The next line specifies the type of sensitivity (One leading space followed by 4 capitalized characters)  
> EMIS: Emissions  
> INIT: Initial Conditions  
> BOUN: Boundary Conditions  
> RATE: Reaction rate  
> HIGH: Higher-order sensitivity.  
> (mandatory) For EMIS, the next line specifies the emissions streams to be used for this parameter. The comma-delimited list must have two leading spaces. The stream names must be defined in the run script. Alternatively, the key word ‘TOTA’ will use all model emissions for this parameter.

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**Author:** ![LMZ](https://avatars.discourse-cdn.com/v4/letter/l/a587f6/32.png) [@LMZ](https://forum.cmascenter.org/u/LMZ)\
**Post date:** [September 20, 2024, 1:42am UTC](https://forum.cmascenter.org/t/fail-to-generate-the-asens-file-in-cmaq-ddm-v5-4/4005/24 "2024-09-20T01:42:51Z")

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Hello, I sincerely thank you again for your professional guidance. It is already running now, but I would like to consult you again about a problem. I want to extract the contribution of total VOC to HCHO column concentration, but it says in this [CMAQ/DOCS/Users\_Guide/Appendix/CMAQ\_UG\_appendixF\_elmo\_output.md at main · USEPA/CMAQ · GitHub](https://github.com/USEPA/CMAQ/blob/main/DOCS/Users_Guide/Appendix/CMAQ_UG_appendixF_elmo_output.md) link that CMAQ5.4 does not have the name of total VOC. To extract the contribution of total VOC emissions to the concentration of HCHO columns in the grid

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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, 4:56pm UTC](https://forum.cmascenter.org/t/fail-to-generate-the-asens-file-in-cmaq-ddm-v5-4/4005/25 "2024-10-29T16:56:28Z")

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“Total VOC” is not something that CMAQ generates. Instead, CMAQ provides fields of explicit or lumped VOC species depending on the mechanism. It is up to you decide what you want “total VOC” to mean. Generally, that would depend on your specific application.

Sergey

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