There was a recent report on Democracy Now about Safecast, a volunteer organization dedicated to measure levels of radiation in Japan.
Safecast is a network of volunteers who came together to map radiation levels throughout Japan after the Fukushima Daiichi nuclear power plant disaster in 2011. They soon realized radiation readings varied widely, with some areas close to the disaster facing light contamination, depending on wind and geography, while others much further away showed higher readings. Safecast volunteers use Geiger counters and open-source software to measure the radiation, and then post the data online for anyone to access.
The article states that people are finding much higher levels than have been reported by the government. This is what we are trying to do locally.