# Can not Find PM25AT PM25AC PM25CO in CMAQv5.1

**URL:** <https://forum.cmascenter.org/t/can-not-find-pm25at-pm25ac-pm25co-in-cmaqv5-1/1051>\
**Category:** Chemistry and Aerosols\
**Created:** [October 16, 2019, 2:12am UTC](https://forum.cmascenter.org/t/can-not-find-pm25at-pm25ac-pm25co-in-cmaqv5-1/1051 "2019-10-16T02:12:42Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ZZD](https://avatars.discourse-cdn.com/v4/letter/z/ed655f/32.png) [@ZZD](https://forum.cmascenter.org/u/ZZD)\
**Post date:** [October 16, 2019, 2:12am UTC](https://forum.cmascenter.org/t/can-not-find-pm25at-pm25ac-pm25co-in-cmaqv5-1/1051/1 "2019-10-16T02:12:43Z")

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Hi~  
I’ve read the User Guide and find there are three factors to constitute the PM2.5, but i can’t find them,and what about PM2.5~10? Can it been expressed like PM2.5?

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**Author:** ![ZZD](https://avatars.discourse-cdn.com/v4/letter/z/ed655f/32.png) [@ZZD](https://forum.cmascenter.org/u/ZZD)\
**Post date:** [October 17, 2019, 1:21am UTC](https://forum.cmascenter.org/t/can-not-find-pm25at-pm25ac-pm25co-in-cmaqv5-1/1051/2 "2019-10-17T01:21:32Z")

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Oh,l’ve found the PM25AT PM25AC and PM25CO in the CCTM\_AERODIAM\* file which have been output in CCTM. But i still want to know if it is suitable to subtract PM2.5 from the aerosol total mass to get PM2.5~10