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In order to predict the atmospheric concentrations of sulphur dioxide and sulphates down wind of source regions several phenomena must be quantitatively accounted for: 1. atmospheric transport and diffusion [;] 2. precipitation scavenging [;] 3. dry deposition at the earth's surface [;] 4. conversion of SO₂ to sulphates. The simplest approach to solving this problem uses a "trajectory box model" with appropriate parameterization of items 2 to 4 above. This type of model has been applied in Europe and is presently being adopted to the North American scene by the Atmospheric Environment Service.  1, fiche 1, Anglais, - trajectory%20box%20model

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