# Lower O3 concentration

**URL:** <https://forum.cmascenter.org/t/lower-o3-concentration/5576>\
**Category:** CMAQ\
**Created:** [February 9, 2025, 7:58am UTC](https://forum.cmascenter.org/t/lower-o3-concentration/5576 "2025-02-09T07:58:56Z")\
**Posts on this page:** 3\
**Page:** 1

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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:** [February 9, 2025, 7:58am UTC](https://forum.cmascenter.org/t/lower-o3-concentration/5576/1 "2025-02-09T07:58:56Z")

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![307521527494a2a477d30cf082c3a9e](https://canada1.discourse-cdn.com/flex027/uploads/cmas/original/2X/6/6bdd1f101771a44400547def76baff21ff5a178f.png)  
Hi professors, I am currently using CMAQ’s DDM simulation and I found that the simulated O3 concentration as well as NO2 and PM2.5 are very low, what are the areas I should look at to find the problem?

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**Author:** ![lizadams](https://avatars.discourse-cdn.com/v4/letter/l/49beb7/32.png) [@lizadams](https://forum.cmascenter.org/u/lizadams)\
**Post date:** [March 30, 2025, 7:22pm UTC](https://forum.cmascenter.org/t/lower-o3-concentration/5576/2 "2025-03-30T19:22:47Z")

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Marking this as a duplicate post. [Lower simulation concentration](https://forum.cmascenter.org/t/lower-simulation-concentration/5532)

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**Author:** ![lizadams](https://avatars.discourse-cdn.com/v4/letter/l/49beb7/32.png) [@lizadams](https://forum.cmascenter.org/u/lizadams)\
**Post date:** [April 2, 2025, 7:48pm UTC](https://forum.cmascenter.org/t/lower-o3-concentration/5576/3 "2025-04-02T19:48:04Z")

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Closed on April 2, 2025, 7:48pm UTC