The dispersion of odour from a composting plant was calculated with the CALPUFF modeling system, where site specific meteorology and geophysical informations were taken into account. The odour emissions, both from forced and free-convection sources, were measured by means of dynamic olfactometry and implemented in the model. The results obtained from the model were verified with a MOS sensor based Electronic Nose equipped with a preconcentrator, placed in two target sites 50m and 250m far from the plant. Odour episodes, detected by electronic nose, were compared with model's forecast; a procedure for tuning the model parameters is needed, in order to reproduce Electronic Nose measurements.
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