On-road emissions for fine-scale model grids (e.g., 4-km grid cells or smaller) may be
based on a link-based mentioned in Section 17.2. The VMT and speed data needed for a linkbased
approach can be provided using a Travel Demand Model (TDM). These models require
their own sets of inputs, which depend on the specific TDM used. Details on using TDMs for
link-based on-road mobile emissions are available from the EIIP document “Use of Locality-
Specific Transportation Data for the Development of Source Emission Inventories”
Emissions models have other input files that must be created. For example, criteria may
be needed for selecting elevated from non-elevated point sources. Each model has a large
number of files and settings which work together in fairly complex ways; therefore, care must be
taken to determine the files needed for the emissions model, and to prepare all needed input files
in a way that will support using the emissions model for the specific air quality modeling
17.4 How Are Inventory Data Converted Into Air Quality Model Input?
Emissions models are used to convert inventory data to inputs for air quality modeling.
As described in Section 17.3, additional ancillary data is needed to complete the process. The
emissions data from each of the five emissions sectors are temporally allocated, chemically
speciated, and spatially allocated. The resulting hourly, gridded, and speciated emissions from
39At the time this document was written, tools to readily predict future-year land use
patterns are not readily available in a form for use in emissions modeling.
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