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Air dispersion model-ing is widely used to estimate the concentration of groundlevel pollutants from emission sources.Dispersion models often are utilized during preparation and evaluation of air permit applications, and in other instances where air pollution control strategies must be evaluated or improved.One commonly used model is SCREEN3, which offers a simple, easy-to-use method of obtaining pollutant concentration estimates. About This ArticleThis article is the second in a two-part series on air dispersion modeling.

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