Abstract Legal regulations and technical procedures used to judge the impact of hydrocarbon emissions by an oil refinery on the environment are described. Based on a survey of all hydrocarbon emission sources of a refinery, the fraction of the immission level caused by the refinery to the neighbourhood can be predicted by means of propagation calculations. By comparison of measured and calculated immission values against the official immission limit values, the significance of the refinery's emissions can be judged. The conditions which have to be fulfilled to obtain the permit from the authorities can then be formulated.We make out the best of all security level in the refinery enviroment
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