That would depend on yield, cities selected, and many other parameters.
Only two cities in Japan have been attacked with nuclear bombs at the end of WW2: Hiroshima and Nagasaki.
Italy's are in many different parts of the country, so they are scattered around. Most of the main cities are in the north of Italy.
The main reason for poor living conditions in cities was overcrowding due to rapid urbanization and migration from rural areas. This led to inadequate housing, lack of sanitation facilities, and strained infrastructure unable to support the growing population.
Back in World War II there were bombs and soldiers going around with guns, but now America has nuclear warheads that can take out entire nations. Opposed to when countries could only take out cities.
nuclear attacks
Nuclear power is not usually sited in cities, I'm not aware of any plants that are. They are always sited in non-urban areas.
There all from Different cities in and around New York
Nuclear weapon detonations
India has 19 nuclear power stations all together.
Hiroshima and Nagasaki
Hiroshima and Nagasaki
During World War 2 they were 'nuked' (bombed with a nuclear bomb) by the American and British forces. These cities are the only cities ever to be a victim of a nuclear attack in a war.