Measurement results of environmental radiation levels in Tokyo

  • Home
  • Measurement results of environmental radiation levels in Tokyo

Measurement results of radiation and radioactivity levels in Tokyo

The Tokyo Metropolitan Institute of Public Health monitors environmental radiation doses throughout the year.

In response to the accident at TEPCO's Fukushima Daiichi Nuclear Power Plant in March 2011, we have posted the latest measurement results of radiation doses in the air and radioactive material levels in tap water and fallout (dust and rain) on this website, in order to relieve health concerns among Tokyo residents.

Radiation doses in the air (latest)

Measurement at monitoring posts

07:01-08:00, Sun., 23 Nov (average value)
Tokyo
  • Shinjuku
  • 0.0348
  • Edogawa
  • 0.0687
  • Kodaira
  • 0.0351
  • Ota
  • 0.0424
  • Adachi
  • 0.0439
  • Chofu
  • 0.0345
  • Hachioji
  • 0.0349
  • Koto
  • 0.0381

Dose of Radiation in the World

The dose of radiation in Tokyo is comparable with that in major cities in the world.


Radiological Monitoring data in the Major Cities
City Dose of Radiation
(uSv/h)
Date of measurement
New York 0.094 31 May.,2011
Paris 0.058 13 Nov.,2014
London 0.090 17 Nov.,2014
Beijing 0.059 15 Nov.,2014
Latest Radiological Monitoring data in the Major Cities (Japan National Tourism Organization)
Monitoring sites
Shinjuku Hyakunincho, Shinjuku-ku (Tokyo Metropolitan Institute of Public Health)
Koto Aomi, Koto-ku (Tokyo Metropolitan Industrial Technology Research Institute)
Ota Haneda Airport,Ota-ku
Adachi Toneri Park, Adachi-ku (Metropolitan Toneri Park)
Edogawa Kami-shinozaki, Edogawa-ku (Metropolitan Kami-shinozaki Park)
Hachioji Minami Osawa, Hachioji-shi (Tokyo Metropolitan University)
Chofu Nishi-machi, Chofu-shi (Chofu Airdrome)
Kodaira Nakajima-machi, Kodaira-shi (Tokyo Metropolitan Medical Plant Garden)

Monitoring posts in Shinjuku, Ota, Adachi, Hachioji and Chofu have been established at the request of the Ministry of Education, Culture, Sports, Science and Technology.
Monitoring posts in Edogawa and Kodaira have been established by the Tokyo Metropolitan Government’s Bureau of Social Welfare and Public Health, and the one in Koto by the Industrial Technology Research Institute.
Only the monitoring post in Shinjuku has been collecting data since before the Great East Japan Earthquake.


Examination results of radioactive materials in tap water (latest)

Unit: Bq/kg

Sampling date/time lodine Radioactive cesium
131 134 137
8:30, Sat., 22 Nov. ND(not detectable) ND(not detectable) ND(not detectable)
8:30, Fri., 21 Nov. ND(not detectable) ND(not detectable) ND(not detectable)
8:30, Thu., 20 Nov. ND(not detectable) ND(not detectable) ND(not detectable)

Examination results of radioactive materials in fallout (latest)

Unit: Bq/m2

Sampling date lodine Radioactive cesium
131 134 137
15:00, Thu., 20 Nov. - 15:00 the following day ND(not detectable) ND(not detectable) ND(not detectable)
15:00, Wed., 19 Nov. - 15:00 the following day ND(not detectable) ND(not detectable) ND(not detectable)
15:00, Tue., 18 Nov. - 15:00 the following day ND(not detectable) ND(not detectable) ND(not detectable)

Measurement results of radiation doses in the air at 100 locations in Tokyo (Jun. 2011)

June 24, 2011
We zoned the entire Tokyo area and in principle measured radiation doses in the air at one location in each zone.