Heavy metal background levels and pollution temporal trend assessment within the marine sediments facing a brownfield area (Gulf of Pozzuoli, Southern Italy).

6 ), showing first a gradual increase from the beginning of the last century, then an exponential increase from the post-war period until the 1960s–1980s (the peak of steel production), and finally a decreasing trend to intermediate values after the end of the industrial exploitation of the area.

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7 a), characterized by the construction and the starting of the steel-plant, show an increasing trend of the ANT/(ANT+PHE).

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