Tokyo Gov. Shintaro Ishihara instructed his staff Monday to monitor radiation levels in the capital in the wake of the accidents at the Fukushima No. 1 nuclear power plant.

"We will do this immediately," Ishihara said. While experts have told the metro government the Tokyo area is not in danger of radioactive substances coming over from Fukushima, he decided to take this step to alleviate public concerns.

"Everyone, please feel relieved," he said, asking residents not to be influenced by groundless rumors and to stay calm. "Together with (other parts of the) metropolitan area, Tokyo would like to overcome this national crisis."