Real-time radiation readings around Fukushima Prefecture can be found on NRA’s website here.
A couple of the cities near the plant had no stations but there is a wide variety around the region. In more recent years radiation monitors in Fukushima prefecture have been gradually replaced. We have found many of these to be over the .5 uSv/h level used for evacuation at Chernobyl in the early years post-disaster.
NRA’s radiation database for various types of monitoring can be accessed here https://radioactivity.nsr.go.jp/en/
SPEEDI radiation data for various locations around Japan has been taken offline in Japan as of 2021.
SPEEDI historical data has also been removed. We do have some of the data archived in spreadsheets. If you need access contact us through our contact page.
Prefecture Radiation Monitoring:
Miyagi Prefecture radiation monitoring
IIJD compiles radiation readings for Japan from a variety of sources, updated frequently usually within 24 hours or less
Radiation Network has a limited number of sensors in Japan
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