# Questions for SMOKE EDGAR-HTAP (flux,emission)

**URL:** <https://forum.cmascenter.org/t/questions-for-smoke-edgar-htap-flux-emission/5501>\
**Category:** SMOKE\
**Created:** [January 8, 2025, 5:27am UTC](https://forum.cmascenter.org/t/questions-for-smoke-edgar-htap-flux-emission/5501 "2025-01-08T05:27:35Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Heomin](https://avatars.discourse-cdn.com/v4/letter/h/9fc348/32.png) [@Heomin](https://forum.cmascenter.org/u/Heomin)\
**Post date:** [January 8, 2025, 5:27am UTC](https://forum.cmascenter.org/t/questions-for-smoke-edgar-htap-flux-emission/5501/1 "2025-01-08T05:27:35Z")

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Hi Cmas users,

I am working on converting EDGAR and EDGAR-HTAP inventories into CMAQ-ready emission formats using the SMOKE system. However, when reviewing the inventories provided by EDGAR, I noticed that they offer both `flx` (fluxes) files and `emi` (emission) files.

I would like to understand the reason why the SMOKE system uses `flx` files and what the exact meaning of `flx` files is.

Thank you in advance for your assistance.

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**Author:** ![bbaek](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.cmascenter.org/bbaek/32/22_2.png) [@bbaek](https://forum.cmascenter.org/u/bbaek)\
**Post date:** [January 8, 2025, 2:41pm UTC](https://forum.cmascenter.org/t/questions-for-smoke-edgar-htap-flux-emission/5501/2 "2025-01-08T14:41:17Z")

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@Heomin. I am not quite sure the exact unit of your “flx” and “emi” files from your EDGAR-HTAP inventories but, SMOKE uses the emissions in the unit of kg/m2/sec from the EDGAR files. To convert these Lat/Lon projection EDGAR gridded emissions to your modeling domain, we need to regrid them based on MSFX2 (m2 of map-scale factor) from GRIDCRO2D file.  
Hope this gives you an idea why we used the emission in unit of kgm/m3/sec.

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**Author:** ![Heomin](https://avatars.discourse-cdn.com/v4/letter/h/9fc348/32.png) [@Heomin](https://forum.cmascenter.org/u/Heomin)\
**Post date:** [January 9, 2025, 8:46am UTC](https://forum.cmascenter.org/t/questions-for-smoke-edgar-htap-flux-emission/5501/3 "2025-01-09T08:46:10Z")

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Thank you for your kind response.

I understand that the unit of the flux files provided by EDGAR is **kg/m²/s** , while the unit of the emission files is **ton/year**.

However, I would like to know why the flux files ( **kg/m²/s** ) are used instead of the emission files ( **ton/year** ).

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**Author:** ![bbaek](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.cmascenter.org/bbaek/32/22_2.png) [@bbaek](https://forum.cmascenter.org/u/bbaek)\
**Post date:** [January 9, 2025, 3:08pm UTC](https://forum.cmascenter.org/t/questions-for-smoke-edgar-htap-flux-emission/5501/4 "2025-01-09T15:08:32Z")

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You need to use the emission flux values (kg/m2/sec) to properly regrid the EDGAR gridded emissions into another modeling domain with MSFX ratio dx\*dy/true-Earth-area( cell ).

I thin it woul be best for you to review a routine called “genlgmat.f” located under …src/grdmat folder.

Follow the use of MSFX variable and you will see how the regridding are processed based on the type of map projections.