[en] At the Fukushima Daiichi Nuclear Power Station on August 19, 2013, radioactive dust was scattered during rubble removal work. At that time, a rise in radioactivity was seen at five monitoring posts in the north-northwest leeward from the site up to Namie-cho. Furthermore, contamination exceeding the standard level was found from the rice harvested in the autumn of the same year at Minami-soma City paddy field 10 to 20 kilometers away from the nuclear plant in the north-northwest direction. This is the so-called polluted rice incident in 2013. Initially, TEPCO estimated the amount of radioactive materials released as '4 trillion Bq', but it re-calculated and reported as '260 billion Bq'. On October 31, 2014, the Nuclear Regulation Authority recalculated it as '110 billion Bq', which eventually became 1/36 of the original. Regarding the causal relation between the debris removal and the exceeding of standard value, at the meeting including the Nuclear Regulation Authority, the Ministry of the Environment, the Ministry of Agriculture and Forests convened by the Cabinet Office, Support Team for Residents Affected by Nuclear Incidents on July 30, 2014, the question that 'the rubble removal work may be the cause' was renounced, and it was concluded by saying 'the causal relation is unclear'. The Nuclear Regulation Authority estimated that the amount of fall to Minami-soma city was very little and the chairman declared that the relevancy between rice pollution and debris removal was 'almost none' and thus 'non-scientific' conclusion passed. The cause of rice pollution incident still remains unknown. (A.O.)