WRF-Chem is the Weather Research and Forecasting (WRF) model coupled with Chemistry. The development of WRF-Chem is a collaborative effort among the community. NOAA/ESRL scientists are the leaders and caretakers of the code. The Official WRF-Chem web page is located at the NOAA web site. Our model development is closely linked with both NOAA/ESRL and DOE/PNNL efforts. Description of PNNL WRF-Chem model development is located at the PNNL web site as well as the PNNL Aerosol Modeling Testbed.

Global model simulations with the ability to have areas of the globe represented at regional scales is now available via the MUSICA project. In October 2020, a CAM-chem computation for simulating the contiguous US (CONUS) at ~14 km grid spacing and the rest of the world at ~1 degree grid spacing was released to the community. Since then CAM-chem with regional refinement over other regions of the world has been developed. For more information, see the MUSICAv0 web page. To see how MUSICAv0 compares to a WRF-Chem simulation, please check out the MUSICA vs WRF-Chem tab.


March 2022  : An error was found in j_no3 in the MOZART chemistry options. In the mapping files (./chem/KPP/mechanisms/*jmap) the current assigment no3o : j_no3_a needs to be changed to no3o : j_no3_a + j_no3_b. After making this change a full recompile is needed. 

February 2022: Thanks to Caterina Mogno (University of Edinburgh, UK) the recently released EDGARv5.0 emission inventory is now available in MOZART speciation for use with anthro_emiss. See this link for more information and to download the data set. 

February 2022: A bug fix has been made to the epa_anthro_emis tool which corrects for an error in the mapping and specifically affected the results when mapping to higher resolutions. Thanks to a user for providing this fix.

October 2020: U.S.EPA NEI 2017 input data are now available for download. See TOOLS tab for more information.

ACOM WRF-Chem Developments for the Community

MOZART trace gas chemistry with GOCART aerosol scheme   Users Guide

MOZART trace gas chemistry with MOSAIC aerosol scheme

  Users Guide
MOZART-T1 trace gas chemistry with GOCART aerosol scheme (new in V4.0)   Users Guide
New TUV photolysis code (phot_opt = 4)
Requires an additional data file; See Instructions for bug fix for WRFV3.9 and WRFV3.9.1:
Additional Data File
Trajectories monitoring meteorology, chemistry, etc   Instructions
Output of Integrated Reaction Rates (new in V4.0)
IRR can be analyzed with PERMM Analysis Tool:
PERMM Users Guide
Henry's Law Table (new in V4.0)   More Information
EPA_ANTHRO_EMIS TOOL   See TOOLS tab for more information.


Go to TOOLS page for more information:

  • US EPA anthropogenic emissions
  • Global anthropogenic emissions
  • MEGAN biogenic emissions
  • FINN fire emissions
  • Interpolate global model output for WRF-Chem initial and boundary conditions

Please see the Best Practices 2015 Tutorial Presentation that includes example namelists for running with MOZCART and MOZART-MOSAIC.

Submit questions regarding the tools and developments from our group to the WRF-Chem Discussion Forum.
For all other requests we refer to the WRF Forum.


WRF-Chem/DART is being used for: (i) development of efficient satellite retrieval data assimilation methods (compact phase space retrievals); (ii) independent and joint assimilation of atmospheric composition and meteorological observations, and (iii) estimating/constraining emission with the state augmentation methods. WRF-Chem/DART is being applied to two field campaigns, FRAPPE and KORUS-AQ, for atmospheric composition forecasting and data assimilation research. WRF-Chem/DART is also being applied to the MarcoPolo - Panda project for regional air quality forecasting in China.


New users may register and download WRF-Chem at the WRF Model Download page. Raw model output is available at the NCAR Research Data Archive (NCAR RDA ds340.0) for research purposes.


Please direct questions/comments about this page to:

Gabriele Pfister



Mary Barth