# Extreme low simulated O3 concentration

**URL:** <https://forum.cmascenter.org/t/extreme-low-simulated-o3-concentration/1575>\
**Category:** CMAQ\
**Created:** [June 15, 2020, 6:15am UTC](https://forum.cmascenter.org/t/extreme-low-simulated-o3-concentration/1575 "2020-06-15T06:15:57Z")\
**Posts on this page:** 1\
**Showing post:** 9

<div class="post-metadata">

**Author:** ![ykaore](https://avatars.discourse-cdn.com/v4/letter/y/ce73a5/32.png) [@ykaore](https://forum.cmascenter.org/u/ykaore)\
**Post date:** [June 22, 2020, 6:25pm UTC](https://forum.cmascenter.org/t/extreme-low-simulated-o3-concentration/1575/9 "2020-06-22T18:25:24Z")

</div>

I am performing another test with CMAQ v5.3.1 (the WRF settings were left unchanged) which I left the script like that:  
set NZ = 23  
##setenv CTM\_EMLAYS 20  
setenv CTM\_PT3DEMIS Y  
setenv CONC\_BLEV\_ELEV “1 1”  
setenv ACONC\_BLEV\_ELEV “1 1”  
setenv APMDIAG\_BLEV\_ELEV “1 1”  
setenv N\_EMIS\_GR 1  
set EMISfile = emissions.ncf  
setenv GR\_EMIS\_LAB\_001 GRIDDED\_EMIS  
setenv N\_EMIS\_PT 0

Following what I have read in this topic [CCTM emission module](https://forum.cmascenter.org/t/cctm-emission-module/449)

---

_[View the full topic](https://forum.cmascenter.org/t/extreme-low-simulated-o3-concentration/1575)._