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In most environmental pollution problems, the pollutant is released to the environment by the, almost always, turbulent flow of a carrier fluid. The pollutant mixes with the surrounding fluid (air or water) and undergoes chemical transformations. A proper account of “where the pollutant went” and “what happened to it” necessitates a theory of turbulent reacting flows, i.e. the simultaneous treatment of mixing and chemical reactions. The important field of Air Quality Modelling is an interdisciplinary field borrowing elements from Fluid Mechanics, Atmospheric Chemistry, Meteorology and others.