There have been many recent stories of high radiation readings in Tokyo that were proven to be not related to Fukushima. For example, false alarms in the water, in Tokyo's Setagaya Ward, and a litany of others, Safecast data proves that Tokyo is well within safe limits and has lower radiation levels than major international cities such as Rome, Italy or Hong Kong, China.
PBS recently featured Safecast:
Eight months after a tsunami caused a nuclear accident in Japan, ordinary people are using new technology and the power of crowdsourcing to find radiation hotspots. NewsHour science correspondent Miles O\'Brien reports from Japan.
The results still show several danger zones in and around Fukushima... The Tokyo areas show completely safe levels. Please check your area for yourself.