3.8 PM Species

For the 2023 NEI Point inventory, the five species (EC, OC, SO4, NO3, and PMFINE) of PM2.5-PRI and diesel PM (which are duplicated from the reported values of PM2.5-PRI for diesel mobile engines such as locomotives and diesel-fueled ground support equipment) are included. These species are generated by using the PM speciation ratios as found on the Air Emissions Modeling website.