These refined dispersion models are listed in the Guideline of Air Quality Models (pdf) (531.03 KB, 11-29-2024, 89 FR 95034) and are required to be used for State Implementation Plan (SIP) revisions for existing sources and for New Source Review (NSR) and Prevention of Significant Deterioration (PSD) programs. The models in this section include the following:
AERMOD Modeling System - A steady-state plume model that incorporates air dispersion based on planetary boundary layer turbulence structure and scaling concepts, including treatment of both surface and elevated sources, and both simple and complex terrain.
CTDMPLUS - A refined point source gaussian air quality model for use in all stability conditions for complex terrain.
OCD - A straight line Gaussian model developed to determine the impact of offshore emissions from point, area or line sources on the air quality of coastal regions.
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