In the wake of the 2011 nuclear crisis, radiation levels at homes and areas nearby in a Fukushima village remain around three times higher than the government target despite cleanup work having been performed, an environmental group has said.

In some areas of the village of Iitate and the town of Namie, levels of radioactivity detected at some points among tens of thousands checked in surveys last September and October were higher than they had been the previous year, Greenpeace Japan said in a report released Thursday.

Most of the six houses surveyed in Iitate, located around 40 kilometers northwest of the crippled Fukushima No. 1 complex, logged radiation levels higher than the government-set target of 0.23 microsieverts per hour, ranging from 0.2 to 0.8 microsieverts per hour.