Cesium 134 and 137 were measured in the air of Tokyo on 1/20/2012.
This may be from the incinerated ash from the radioactive debris, but the ratio of 134 and 137 are the same.
(Bq/m3)
Cesium 134 : 0.0003
Cesium 137 : 0.0003
Location
Iori Mochizuki