Why does the disaster at chernobyl rankas the worst nuclear disaster in european history?

There has not been many nuclear disasters in Europe, and the ones that have been have all had minor consequences, apart from one, Chernobyl. The Chernobyl nuclear disaster surpasses by far all others on the continent. This nuclear disaster managed to kill thousands of people instantly or after some time, and millions of people in the surrounding area have had consequences because of it. The area where it happened has been totally abandoned, and even nowadays there's no people living there because the radiation is still very high and extremely dangerous. It also prompted forced migration of the people from the region where it happened, so there were also multiple other problems, from economic, political, urban, humanitarian.