Milan-Bovisa (Gasometri area)

Bovisa was home to the city's large town-gas production and storage works, now dismantled; the gasholder frames remain. The area, enclosed between the Bovisa and Villapizzone railway stations, is known as "la Goccia" (the Drop).

On 23 November 1999 the Lombardy Region proposed to the Ministry of the Environment that it be included among the remediation sites of national interest; ministerial decree 468 of 2001 listed it as such, and the provisional perimeter, sent by the City of Milan in January 2002, was set by decree of 8 July 2002. Since January 2013 the Region has been responsible.

According to the ministry's 2001 site sheet the works supplied Milan with gas from 1908 to 1994, by coal distillation until 1969. The contaminated soil to be treated was put at 90,000 m³: the main pollutants are heavy metals and PAHs, with high BTX values on the former benzole-recovery plant and ferrocyanides in the south-east. Eight survey campaigns were run between 1995 and 1999. The City's preliminary project provided for soil washing, soil vapour extraction and bioventing for the soil and capping to confine some areas; the cost was put at 48 billion lire. The sources consulted do not say how much of that project was carried out.

A study published in 2006 worked on lead-contaminated soil from the Bovisa brownfield.