Model Options

Due to the range and combinations of physical conditions, dispersion models are often simplified and designed for specialized applications in limited situations. The EPA has designated Appendix A models for use under such specific applications and may require the selection of predetermined options for regulatory application. Some examples of specialized functions include simple screening versus refined modeling, terrain features, surrounding land use, pollutant averaging period, number and type of sources to be modeled, and additional influences to the release. These functions are discussed next.

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