13.3 What Factors Affect My Choice of A Model For A Specific Application?
States/Tribes should consider several factors as criteria for choosing a qualifying air
quality model to support an attainment demonstration or uniform rate of progress assessment.
These factors are: (1) documentation and past track record of candidate models in similar
applications; (2) advanced science and technical features (e.g., probing tools) available in the
model and/or modeling system; (3) experience of staff and available contractors; (4) required
time and resources versus available time and resources; and (5) in the case of regional
applications, consistency with regional models applied in adjacent regions. Finally, before the
results of a selected model can be used in an attainment demonstration, the model should be
shown to perform satisfactorily using the data base available for the specific application.
Documentation and Past Track Record of Candidate Models. For a model to be used
in an attainment demonstration, evidence should be presented that it has been found acceptable
for estimating hourly and eight-hourly ozone concentrations and/or hourly and 24-hour average
PM2.5 and PM component concentrations. Preference should be given to models exhibiting
satisfactory past performance under a variety of conditions. Finally, a user’s guide (including a
benchmark example and outputs) and technical description of the model should be available.
Advanced Technical Features. Models are often differentiated by their available
advanced science features and tools. For example, some models include advanced probing tools
that allow tracking of downwind impacts from upwind emissions sources. Availability of
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