POLLUTION Square of reclamation of the surrounding territory to the ICMESA on board of a truck with detritus. The 10 July 1976 a dioxine cloud leaked from the chemical plant of Seveso contaminating the zone provoking one of the greatest environmental disasters. Inside a reactor of the factory the Tcf was produced triclorofenolo (); raw materials for the cosmetic production; disinfectants weeding hospitals worker and. The temperature had to be maintained under the 156 degrees. To advanced temperatures; in fact; the dioxine formation begins (Tcdd); a most powerful poison. Higher it is the temperature; more dioxine form. The 10 July; instead; in the reactor; the temperature rooms suddenly until to exceed the 300 degrees. The safety valve breaks and leaks a vapor cloud that the wind transports for some kilometer in south-east direction; over the cities of Meda and Cesano Maderno. Four days more late the first cases of skin burns are recorded on the skin children and adults and a moria of rabbits. Also the leaves of the trees begin to wither. Ten days after; eighteen people were ricoverate in hospital. The mayor of Seveso prohibited to eat the ortaggi and advised to wash the hands carefully. Fifteen days after the incident the evacuation of the zone was ordered; because also the houses turned out contaminated.