Sources identified as contributing to the monitor will be modeled with a dispersion model

(or alternatively, a very high resolution grid model) . It is common practice to run dispersion

models for limited numbers of point sources in relatively small areas (out to a distance of ~50

km). Dispersion models can also be run with all sources of primary PM in a limited area

(including mobile, non-road, and area sources).

When applying the model to evaluate changes in primary PM2.5, one should determine the

PM2.5 species that make up the local primary particulate matter57. We recommend that the

individual components of primary PM2.5 are tracked separately in the dispersion model. This will

allow more thorough evaluation of the dispersion modeling results (comparing model output to

speciated ambient data) and may aid in the development of primary PM2.5 control strategies.

The majority of the primary PM will consist of the primary portion of the organic carbon


57The PM2.5 emissions should be broken out into individual species using the best

information available. Typically, SCC specific speciation profiles are used to “speciate” the PM

into individual components. Local, source specific information should be used whenever



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