The CALINE3 model (Benson 1979) was designed to estimate highway traffic concentrations of nonreactive pollutants for the state of California. The model is a steady-state, Gaussian-based model capable of predicting 1-hr to 24-hr average concentrations from urban or rural roadway emission sources located at grade, in cut sections, in fill sections, and over bridges as shown in Figure 5.8.17. The program assumes all roadways have uncomplicated topography (i.e., simple terrain). Any wind direction and roadway orientation can be modeled. Primary pollutants can be modeled, including particulate matter, for which the model uses deposition and settling velocity factors. However, unlike the other models, CALINE3 does not account for any plume rise calculations.
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