Here are some real-time radiation measurements from a geiger counter about 15 miles due west of Tokyo, Japan.
http://park30.wakwak.com/~weather/geiger_index.html
The levels appear to be slightly elevated from normal values for the area. This measurement sensor is about 150 miles south-southwest of the Fukushima Daiichi plant.
Current weather conditions for Tokyo are found here: http://park18.wakwak.com/~weather/WDlive/wdlive_index.html
It looks like winds are right now from the south and around 15-20 mph. What isn’t wanted is winds from the north and thankfully the forecast for the next couple days appears to keep it that way.