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Pages 1-2

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From page 1...
... Emission estimates also can serve as inputs to dispersion models that use meteorological information to simulate the atmospheric dispersion of pollutants and estimate resulting spatial concentrations. The examination of accuracy and uncertainty of methods and models in this report is done mostly on a qualitative basis, identifying strengths and weaknesses, as well as evaluating the parameters that have the largest impact on final emissions and highest uncertainty relative to others.
From page 2...
... The Conceptual Model provides the link between economic activity, freight transportation activity, freightrelated emissions, and associated health effects. Finally, the report presents five recommended areas for research that offer great promise for improving freight emissions estimates.


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