Mortality from malignant pleural neoplasms in Italy, 1980-87, was studied in order to detect areas at risk. The number of observed deaths occurring in each of the 8000 Italian municipalities was contrasted to the expected figure obtained from regional and/or national rates; whenever a significant increase, based on at least three observed cases, was detected, the municipality was included in the study. The main findings in Piedmont concern the city of Casale Monferrato, where an important asbestos cement factory is located, and some areas characterized by the presence of the textile industry. Genoa and other harbours of the northwestern coast, where important shipyards are located, were detected. In Lombardy an increased in risk concerning women was observed in several municipalities. Major increases in risk were seen in Venice. Trieste and Monfalcone, where important shipyards are located. In Tuscany, the highest risk was reported in Leghorn and surrounding areas; naval industry and chemical industries should be considered. In southern Italy, several cities with industrial harbours were shown to be at risk.