Memory, trauma and then renewal: the meaningful roots of “Bosco delle Querce”
What today appears as a lively park, frequented by families, children, and young people, is in fact the result of one of the most profound and complex territorial transformations in contemporary Italy. Where flowering meadows and butterflies can now be seen, there were once houses, roads, and even a baseball field. Today, nature has returned as the protagonist—but without erasing the past. Instead, it preserves it after a terrible disaster that profoundly shaped Italian and European history.
On July 10, 1976, a chemical accident at a plant in Seveso released a toxic cloud containing dioxin over the surrounding area. Thousands of residents were exposed, entire neighborhoods were evacuated, and large sections of land were declared contaminated. The toxic cloud affected nearby municipalities such as Cesano Maderno, Desio, and Bovisio, but Seveso was the most impacted due to the dynamics of the cloud’s dispersion. After the accident, the most affected area was completely transformed. Initially, there were plans to build a large incinerator—Seveso could have become a landfill. Instead, a radically different decision was made: instead of rebuilding what was there before, they created a park that would serve as a living memory of the event.The intention was not to erase everything, but to leave a strong symbol.
Everything was demolished, and the contaminated soil, along with the debris, was sealed inside two large containment basins—true “sarcophagi.” The current landscape was rebuilt above these structures. The larger one lies within Seveso’s territory, the smaller within Meda. The park covers about 43 hectares, 80% of which lies within Seveso. Seveso experience represents “two first times”, one for engineering with the construction of the containment basins, designed without prior models. Even today, the basins are continuously monitored. Over time, maintenance work has been carried out, including the removal of leachate and updates to meet modern safety regulations, using advanced technologies such as drones and thermal imaging. The fact that these structures remain safe decades later demonstrates the value of a pioneering engineering effort. On the other, the creation of a new ecosystem on a devastated landscape. In the 1980s, agronomists faced a completely barren expanse. Instead of reconstructing what had been there before, they chose to initiate an environmental experiment: transforming the area into a park that would serve as both a natural space and a living memorial.Today, this decision is considered visionary. It allowed nature to reclaim the land while preserving the historical significance of the site.
Comparisons with other disasters, such as Chernobyl, are inevitable but misleading: these are completely different situations. In Chernobyl, contamination is radioactive and long-lasting, whereas here the dioxin, being non-soluble, remains confined as long as it is not disturbed. Another major difference lies in the social and political response: here, the community actively participated in decision-making – the impact on those who refused to leave the place where their lives and roots were deeply anchored.
All those decisions made Bosco delle Querce an experimental park or “a laboratory of biodiversity” as Seveso’s mayor calls it with two complementary dimensions. On one side, the “park”: a structured space with paths, benches, and maintained lawns. On the other, the “forest”: an area left to evolve naturally, where fallen trees are left in place and ecological processes unfold without intervention. Even the name tells a story. Although it is called the “Bosco delle Querce” (eng. “Oak Forest”) oak trees are actually few. The name reflects the historical identity of the area, while today’s reality is characterized by rich botanical diversity.
Green space management is entrusted to ERSAF, in collaboration with the Lombardy Region and the Municipality of Seveso. Alongside maintenance, educational and environmental projects are carried out, often in partnership with organizations such as Legambiente Lombardia New initiatives are underway, including outdoor classrooms for schools, sensory activities, and insect observation. One particularly remarkable aspect is the spontaneous emergence of rare species: thanks to the imported soil, native orchids—protected under a European LIFE project—have appeared in the park. Their exact locations are kept confidential to protect them.
Today, the Bosco delle Querce is more than a park—it is a place of learning. The Seveso disaster led to the creation of the EU’s ‘Seveso Directive’, a landmark regulation designed to prevent and control major industrial accidents. By imposing strict safety standards on hazardous facilities, it has since helped protect countless lives across Europe. It tells the story of what happens when environment, community, and information intersect in complex ways. It shows how a tragedy can become an opportunity for awareness, participation, and care for the land. This is done through school programs, environmental activities, and socio-cultural initiatives. The goal is not only to explain what happened on July 10, 1976, but also to convey what the park represents today and why preserving its biodiversity matters.
It is, at once, memory and future: a place where nature has returned to life, without the past being forgotten.
This article is based on testimonies from the mayor of Seveso, Alessia Borroni, and city councilor Massimiliano Fratter, who shared not only the facts but also the living memory of the community. A special thanks to them for letting us dive deeper into this striking part of EU history.
Chiara Esposito