The 2-D CMAQ dry deposition file (DRYDEP) includes instantaneous hourly dry deposition fluxes (kg/hectare) for selected model species. CMAQ calculates dry deposition for all of the species listed in the dry deposition include files within the mechanism include directories. Dry deposition include files exist for gas-phase species (GC_DDEP.EXT), aerosol species (AE_DDEP.EXT), and inert model species (NR_DDEP.EXT). You can remove species from these DDEP.EXT files to adjust the number of species that undergo the dry deposition process and are written to the DRYDEP output file.