The Spcmat program checks to be sure that the two definitions of the NONHAPVOC pollutant - one from the speciation profiles (GSPRO) file and the other from the inventory table (INVTABLE) file - are consistent. When you are modeling with both criteria and toxics inventories and using toxics VOC (i.e., “integrating” toxics VOC), you must ensure that the definition of toxics VOC used in the INVTABLE file is consistent with the definition in the GSPRO file. Spcmat cannot assure that these files are consistent with each other, but does ensure that the information provided by the user is consistent; it is up to you to make sure that the information provided is correct and consistent with what is actually in the files.

These files need to be consistent because the same pollutants that SMOKE subtracts out of the VOC to create NONHAPVOC must also be removed when the speciation profiles are being computed. This assures that there will be no double-counting of mass when calculating model species from both toxics VOC and from the criteria aggregated VOC value. The GSPRO file format includes a header that allows you to define the toxics VOC that were removed when creating the NONHAPVOC speciation profiles. This is intended to help you ensure that the NONHAPVOC definition in the GSPRO file is consistent with the inventory table file. One important detail of how this is implemented is that Spcmat will not include inventory pollutants that are not actually in the inventory in the consistency check, even if the pollutant is listed in the NONHAPVOC definition in the GSPRO file.