If somebody assigned you to design a map that's extremely difficult to interpret, you probably wouldn't be clever enough to come up with this.<p><a href="https://ibb.co/TLDxBZF" rel="nofollow">https://ibb.co/TLDxBZF</a>
It wasn't at all clear where the data comes from, but after a little digging it looks like volunteers are driving around with homemade devices collecting data.<p><a href="https://bgeigiezen.safecast.jp/store-2/" rel="nofollow">https://bgeigiezen.safecast.jp/store-2/</a><p>Looks like they might have had apps too, but they have been pulled from the App Store and Play Store?
<a href="https://safecast.org/devices/" rel="nofollow">https://safecast.org/devices/</a>
<a href="https://safecast.org/history-of-safecast/" rel="nofollow">https://safecast.org/history-of-safecast/</a>
<a href="https://safecast.org/about/" rel="nofollow">https://safecast.org/about/</a><p>It’s quite a wonderful set of globally-distributed volunteers brought together by varying passions - from hardware hacking to citizen science.<p>Whether from fixed or mobile sensors, whether from radiation or air quality sensors, all data is CC0-licensed at birth and is freely available for download.
Interesting that Three Mile Island is not any higher than background levels. I would have expected even a minor bump. I suppose 45 years is a long time.