# Extremely low PM10 by CMAQv5.3

**URL:** <https://forum.cmascenter.org/t/extremely-low-pm10-by-cmaqv5-3/1785>\
**Category:** CMAQ\
**Created:** [September 17, 2020, 11:04pm UTC](https://forum.cmascenter.org/t/extremely-low-pm10-by-cmaqv5-3/1785 "2020-09-17T23:04:12Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![FengLiu](https://avatars.discourse-cdn.com/v4/letter/f/49beb7/32.png) [@FengLiu](https://forum.cmascenter.org/u/FengLiu)\
**Post date:** [September 17, 2020, 11:04pm UTC](https://forum.cmascenter.org/t/extremely-low-pm10-by-cmaqv5-3/1785/1 "2020-09-17T23:04:12Z")

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Hi,  
I wonder anyone has experience to conduct PM10 simulation using CMAQv5.3.  
I got extremely low PM10 concentrations in entire model domain by CMAQ5.3 from September 1 to 30, 2017. Emissions include precursors of secondary organic aerosols (SOA) and is based on EPA 2017 NEI datasets. I turned on windblown dust options in the run script, and set BELD3 for DUST\_LU\_1 and DUST\_LU\_2. WRFv4.2/MCIPv5.0 outputs show some high wind days are available in this month. The chemistry mechanism is cb6r3\_ae7\_aq. The results from CMAQ post-processor _ **combine** _ show that PM10 is extremely low comparing against observational data within entire domain. Please see attached for the result at one monitor site. However, modeled ozone concentrations (hourly and 8-hourly) are in good agreement with observations.

Some key settings in the run script :  
set MECH = cb6r3\_ae7\_aq  
setenv CTM\_WB\_DUST Y  
setenv CTM\_WBDUST\_BELD BELD3  
setenv CTM\_DUSTEM\_DIAG Y

 ![PM10_OBS_MOD](https://canada1.discourse-cdn.com/flex027/uploads/cmas/original/1X/edb7fe94ec45fda09085b9eefc555fbc87bb8850.png)

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**Author:** ![FengLiu](https://avatars.discourse-cdn.com/v4/letter/f/49beb7/32.png) [@FengLiu](https://forum.cmascenter.org/u/FengLiu)\
**Post date:** [September 29, 2020, 11:03pm UTC](https://forum.cmascenter.org/t/extremely-low-pm10-by-cmaqv5-3/1785/2 "2020-09-29T23:03:37Z")

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Hello,  
I am wondering if anyone has experience to estimate windblown dust or PM-10 using CMAQ v5.3 and CMAQ v5.3.1. I would appreciate if you share your experience such as input preparation and results.  
Thanks.

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**Author:** ![lwu127](https://avatars.discourse-cdn.com/v4/letter/l/ea666f/32.png) [@lwu127](https://forum.cmascenter.org/u/lwu127)\
**Post date:** [March 23, 2022, 2:46am UTC](https://forum.cmascenter.org/t/extremely-low-pm10-by-cmaqv5-3/1785/3 "2022-03-23T02:46:46Z")

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Hi Feng,

I wonder if your PM2.5 concentration is also lower than observation. Did you solve the problem? I kind of encounter similar problems.

Looking forward to your reply!  
Lin