The characterization of air pollution)in a particular area is connected with the acquisition of a series of statistically significant data. The actual case referred to is a sampling campaign developed in a station in an urban area (Rome), throughout a period of 12 months. For controlling the behaviour of aerosol pollution according to a most complete characterization the three following apparatuses have been employed: (a) continuous impact sampler (Hirst Spore Trap) (b) continuous filtration

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... pler (Aisi Sampler) (c) differential 4-stage sampler (Mammarella). Through comparison of data resulting from the three series of sampling it has been possible to analyze: (i) the behaviour of pollution in its complexity (ii) the rate of pollution due to coarse aerosol particles (iii) the median diameters of different fractions of aerosols.