Mobile and Line Source Modeling

Mobile sources are difficult to model because the source is moving and may not be continuously emitting pollutants at a constant emission rate. Nonetheless, environmental engineers often model these sources using line source techniques that assign emissions at fixed points along a line. The U.S. EPA has developed a program called MOBILE5b to calculate emissions from mobile sources based on EPA tests of emissions from a variety of vehicle classes and types. In certain cases, environmental engineers can use the ISC3 models to estimate concentrations at receptors, but the EPA has identified the California line (CA-LINE3), CAL3QHC or CAL3QHCR, and the buoyant line and point source (BLP) models as the most appropriate for calculating emission concentrations from line sources.

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