Data from the Tokyo Metropolitan Institute of Public Health show atmospheric radiation levels in the capital are at the same level as before the Fukushima nuclear disaster started three years ago and are below those in Paris and London.

The average radiation level in central Tokyo was 0.0339 microsievert per hour in Shinjuku Ward on March 6, data showed. That's about the same as the day before the March 11, 2011, earthquake and tsunami caused three reactor core meltdowns at the Fukushima No. 1 plant, 220 km to the northeast.

That reading compares with 0.085 microsievert in London and 0.108 microsievert in Seoul on March 3, and 0.057 microsievert in Paris on Feb. 27, according to a compilation of world monitoring sites on the website of the Japan National Tourism Organization. Radiation levels in central Tokyo were as high as 0.809 microsieverts per hour on March 15, 2011, before declining to 0.0489 microsievert by the morning of March 18.