# How to get PM2.5\_TOT from CMAQ5.4-ISAM outputs by combine?

**URL:** <https://forum.cmascenter.org/t/how-to-get-pm2-5-tot-from-cmaq5-4-isam-outputs-by-combine/3831>\
**Category:** CMAQ-ISAM\
**Created:** [January 8, 2023, 3:08pm UTC](https://forum.cmascenter.org/t/how-to-get-pm2-5-tot-from-cmaq5-4-isam-outputs-by-combine/3831 "2023-01-08T15:08:58Z")\
**Posts on this page:** 1\
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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:** [January 8, 2023, 5:29pm UTC](https://forum.cmascenter.org/t/how-to-get-pm2-5-tot-from-cmaq5-4-isam-outputs-by-combine/3831/2 "2023-01-08T17:29:44Z")

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Hello Allen,

if you wrote out the AELMO files and used the default setup to define their content, you should be able to use the following AELMO variables instead of the old APMDIAG variables in your ISAM PM25\_TOT calculations:

FPM25AIT instead of PM25AT  
FPM25ACC instead of PM25AC  
FPM25COR instead of PM25CO

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