Augmenting data in EIS is the method of taking data from a source data set from a State, Local, or Tribal (S/L/T) organization, and creating a resulting data set that “gap fills” any needed pollutants that may be missing from the source data set. The resulting data set is used in National Emissions Inventory selections to provide a more comprehensive set of data. Currently only HAP and Chromium augmented data are available within EIS.
Augmentation is performed by applying a "best available" multiplication factor to generate a set of pollutants (i.e., "output" pollutants) based on the value of the "input" pollutant from a source data record. The output pollutant multiplication factors are based on characteristics of the source emissions records. These factors are grouped together for a specific source type and input pollutant into an augmentation profile. An augmentation profile is assigned to sources based on at least one of the following criteria (shown in priority order):
The augmentation process for Hazardous Air Pollutants (HAPs) creates emission estimates for HAPs based on CAP emissions from an existing EIS dataset (usually S/L/T). For example, toluene from a wood combustion process can be created by multiplying the VOC emissions by 0.05, which is the ratio of the toluene emission factor to the VOC emission factor.
The formulas used to compute emissions for HAP augmented records is: Emissions (From Input Pollutant) * FACTOR = Emissions (For the Output Pollutant)
Where: Emissions (From Input Pollutant) is the emissions of the input pollutant from the source dataset; FACTOR is the multiplicative factor specific to the source (e.g., specific process, facility, SCC, etc.) and output pollutant from the augmentation profile assigned to the source; Emissions (For the Output Pollutant) is the emissions of the output pollutant from the source dataset.
Chromium augmentation process speciates "total" chromium (i.e., emissions from pollutant code 7440473) into hexavalent and trivalent forms. For example, hexavalent chromium emissions from natural gas combustion is obtained from multiplying chromium by 0.04, since the natural gas combustion emissions have been estimated to be comprised of 4% hexavalent chromium and 96% trivalent chromium.
A default augmentation profile is used for chromium augmentation so that every chromium emission record is speciated to hexavalent and trivalent chromium.
For chromium, the input pollutant is always chromium (i.e., emissions from pollutant code 7440473) and the output pollutant is either hexavalent chromium or trivalent chromium, and the hexavalent and trivalent factor from the same augmentation "profile" sum to 1.
There are four different data table views within the EIS Gateway that display various levels of detail for augmentation factors and the augmentation profiles. Each of the view pages can filter by Augmentation Type (HAP, Chromium, or PM) as well as sorting the data in each column in ascending or descending alphabetical/numerical order. Each column in the table can also filter data using a text entry search box above the column header. You may also download the entire data table or filtered results of the table by creating a CSV download file.
This view displays general information about the profile and source of the profile names and factors.
This data table view displays all the output pollutants and multiplication factors associated with a given Augmentation Profile and input pollutant.
This view displays the characteristics of the data record for which the profile is based including the following data:
This view displays a composite table that provides a comprehensive view of all the combinations of output pollutants and assignment information associated with a given profile.