Chernobyl remembrance

International Chernobyl Disaster Remembrance Day is remembered on
26 April.  On this date in 1986 An explosion at the Chernobyl Nuclear Power Plant spread a radioactive cloud over large parts of the Soviet Union, now the territories of Belarus, Ukraine and the Russian Federation causing imense human and long term environmental damage
The UN resolution  and 
associated United Nations documents provide information and background on events. 
The UNDP also has a specialist website  It contains a depository of UN official documents on Chernobyl nuclear accident

other useful websites considering the long term impact include:

International Atomic Energy Agency (IAEA)

it includes statements from witnesses and scientific organisations on the impact - from the 30th anniversary in 2016 . This includes the shocking 20 year evaluation report

Chernobyl’s Legacy: Health, Environmental and Socio-Economic Impacts

and Recommendations to the Governments of Belarus, the Russian Federation and Ukraine 

 on Chernobyl which used data from the Chernobyl Forum (2003-5)

Also available is a searchable bibliography of texts from the International nuclear system catalogue.and some online videos of effects.

UNSCEAR's assessments of the radiation effects

WANO - Nuclear operators Safety organisation.was established in the wake of the disaster to implement safeguards and share information.  Its website provides access to materials from an operators perspectives.