Particulate Matter Speciation Profiles
PMPROF: The base file for the particulate matter speciation profiles. It contains the unique listing of the particulate matter speciation profile codes and the profile descriptive name. It also contains the fraction of PMT (total particulate matter) that is PM10 (particulate matter less than 10 microns), and the fraction of PMT that is PM25 (particulate matter less than 2.5 microns) for this profile. These are termed the "size fraction" data on this web site. However,they are still fractions by weight.
- PMPRFCD: Field containing the particulate matter speciation profile code assigned to the speciation profile. This code is an arbitrary code assigned by CARB.
- PRFNAME: The descriptive name for the particulate matter speciation profile. This profile may be used for many different source categories (see SCCPM file information), so the profile name will often have a broader definition than the source categories. In some cases, the profile may be "borrowed" by similar sources, when a profile is not available for a specific source. In these cases, there may be some conflict between the profile description, and the SCC description that it is being assigned to. These assignments are considered "low confidence" assignments, and are taken into account in modeling. In some cases, they may result in the exclusion of the source from certain types of modeling.
- WTFRACPM10: This is the size fraction, by weight, that the PM10 is of the PMT. This is the number that will be multiplied by the WTFRACOFPM10 field in the PMSPEC file, and then by the linked CEIDARS PMT emissions (via the SCCPM file) to yield the final speciated PM10 emissions.
- WTFRACPM2PT5: This is the size fraction, by weight, that the PM25 is of the PMT. This is the number that will be multiplied by the WTFRACOFPM2PT5 field in the PMSPEC file, and then by the linked CEIDARS PMT emissions (via the SCCPM file) to yield the final speciated PM25 emissions.
Master-detail link diagram
Using the data
The data in this file are used in order to speciate the PMT emissions from a source into PMT, PM10, or PM25 size fraction-specific compounds. For the PM10 and PM25 emissions, you would first have to multiply the WTFRACOFPM10 and WTFRACOFPM2PT5 fields in the PMSPEC file by the WTFRACPM10 and WTFRACPM2PT5 fields, respectively, in the PMPROF file, by linking on the PMPRFCD field. You would then take the PM10 and PM25 products, and also the original, unmodified WTFRACOFPMT fields, and multiply each of them, independently by the CEIDARS PMT emissions values by linking via the PMPRFCD field to the source categories (SCC/EIC codes) indicated in the SCCPM file via the PMPRFCD field, and then to the CEIDARS emission data files via the SCC field (actually SCC or EIC codes). Note that this profile may link to many SCC/EIC designated source codes.
Note that the calculation process for PMT is similar to the TOG calculation process, but for PM10 and PM25 there is the additional step of multiplying by the size fraction.