Corrosivity of the atm. in an industrial area of a chem. prodn. plant was assessed on the basis of meteorol. data (ay. air temp. and humidity) and SO2 pollution level. The input data for corrosion rate calculation were detd. by using the Gauss cloud model. The C steel corrosion rate detd. under conditions of the industrial area atm. was lower than the allowable by resp. std.