In this note the experimental results of an analysis of the electromagnetic fields present in the productive area of new built oil-mill, placed in Bari district, considered representative of the majority of such a kind of the workshops in the Apulia region, are reported. Introductory study's purpose has been evidently to evaluate the exposure level of the workers during an oil production activity, inside a typology of transformation systems much spread on the Apulian territory that, even though with seasonal character, gives occupation to a big number of operators. Results of the tests highlight that inside the considered oil-mill there are not electromagnetic pollution risks for the operators during the period of maximum use of its productive capacities.