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Ministry of Economy, Trade and Industry survey of air radiation at Fukushima. The measuring have been done at 1 meter and 1 centimeter off the ground around Fukushima evacuation zones.
The survey is showing the highest air radiation of 139 microsieverts/hour at 1 meter off the ground at Okuma-machi, 1.5 kilometer southwest of the Fukushima Daiichi Nuclear Plant. And 368 microsieverts/hour at 1 centimeter in Futaba-machi that is 4 kilometers west of the nuclear plant.
Air Radiation Survey Map 1 Meter Off Ground