for all of these modeling steps. Inconsistencies in approaches between the future-year modeling

and the base-year modeling can lead to artificial differences in air quality modeling results that

can affect conclusions. Therefore, it is critical to avoid such differences whenever possible.

17.7 Emissions Preparation for a Local Area Analysis

In section 5.3 we discuss modeling of local primary PM2.5 sources with a dispersion

model. The emissions for these sources should closely match those used in photochemical

models. For example, every effort should be made to temporalize and speciate the primary

emissions using available profiles. Information on input and formatting of the emissions for

dispersion models can be found in the respective users’ guides. Pre-processing of the primary

emissions with an emissions model may be needed to derive the detailed information needed to

temporalize and speciate the emissions.

In section 5.3 we recommend using “actual emissions” in the local area analysis, as

compared to using “allowable emissions”. By “allowable emissions”, we mean the maximum

amount of emissions from a source which is consistent with emission limitations contained in an


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