Results of the Measurements of Ambient Dose Rates in Major Cities (2024)

These figures show the results of the measurements of ambient dose rates at major cities in and outside Japan. Radiation doses shown in the figures are mostly from 0.029 μSv/h to 0.15 μSv/h, which reveals that radiation doses vary by region. This is mainly because radiation doses from the earth differ due to differences in soil and rocks in respective regions.

Ambient dose rates in four cities in Fukushima Prefecture decreased significantly over time after Tokyo Electric Power Company (TEPCO)'s Fukushima Daiichi NPS Accident and have become almost the same as those in other major cities in and outside Japan.

Sources:
・Overseas cities
New York: EPA Website (as of December 31)
Seoul: IERNet Website (as of November 18)
Taipei: Nuclear Safety Commission Website (as of November 18)
Beijing: National Radiation Environmental Data Website (as of December 31)
Hong Kong: Hong Kong Observatory Website (as of November 18)
Singapore: NEA Website (as of November 17)
Berlin: ODL-INFO Website (as of December 31)
London and Paris: EURDEP Website (as of December 31)

・Cities in Japan
Cities in Fukushima: Fukushima Prefecture Website (as of December 31)
Other major cities in Japan: Nuclear Regulation Authority Website (as of December 31)

• Included in this reference material on March 31, 2019
• Updated on March 31, 2025