Passage: Many watercourses and coastal stretches have also been contaminated by industrial and agricultural activity, while because of rising water levels, Venice has been regularly flooded throughout recent years. Waste from industrial activity is not always disposed of by legal means and has led to permanent health effects on inhabitants of affected areas, as in the case of the Seveso disaster. The country has also operated several nuclear reactors between 1963 and 1990 but, after the Chernobyl disaster and a referendum on the issue the nuclear programme was terminated, a decision that was overturned by the government in 2008, planning to build up to four nuclear power plants with French technology. This was in turn struck down by a referendum following the Fukushima nuclear accident.Deforestation, illegal building developments and poor land-management policies have led to significant erosion all over Italy's mountainous regions, leading to major ecological disasters like the 1963 Vajont Dam flood, the 1998 Sarno and 2009 Messina mudslides.

Question: What disaster is an example of waste for industrial activity being disposed of in illegal ways?
Seveso disaster