Many relevant environmental and health data are available. Extremely high levels of toxic, persistent and bio-accumulating chemical pollutants have been documented. Over the years, these industrial activities have been a major source of environmental pollution.

From the beginning the workforces decreased from 7,000 to the current 3,000 units. Close to the city of Gela, the industrial area, operating since 1962, includes chemical production plants, a power station and an oil refinery plant, one of the larger in Europe, refining 5 millions tons of crude per year. Populations are respectively 26,541 and 5,063. Niscemi and Butera are located border to Gela. Grid reference: 37 degrees 4' 0' N, 14 degrees 15' 0' E.

The site includes a private industrial area, public and marine areas, for a total of 51 km(2).

In 2000 part of it was designated as Gela Reclamation Site of National Interest, RSNI. In 1990 it was declared Area at High Risk of Environmental Crisis. The study area includes the Municipalities of Gela, Niscemi and Butera located in the South of Sicily, Italy.

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