DDM3D is available in CMAQv5.2 CMAQ/CMAQ_DDM.md at 5.2_DDM-3D · USEPA/CMAQ · GitHub
"DDM-3D sensitivities would be calculated to emissions of NOX from one gridded emissions file "
It looks like you need to set the environment variable for EGRIDFILE1 to point to the emissions file.
Please retry this using the instructions for compiling and running DDM3D using CMAQv5.2 that I shared in a link above. CMAQv5.3.2 does not yet fully support DDM3D.
I’m a beginner in both CMAQ and CMAQ-DDM. I’m planning to run CMAQ-DDM in my CMAQ v5.3.2. I was able to run CCTM script without DDM. Now I’m planning to use DDM in my script. I’m not sure how to set the input parameters, what needs to be changed in my script, how to set gridded emission data path etc.? Please have a look into my run script and help me out. Also, please take a look into my emission data snapshot (all is gridded data in the attached image)