The Journal Environmental Science and Technology reports in a new study that the Fukushima radiation plume contacted North America at California “with greatest exposure in central and southern California”, and that Southern California had 2,500 Bq/kg of iodine-131 in seaweed … over 500% higher than other tests in the U.S. and Canada:

Projected paths of the radioactive atmospheric plume emanating from the Fukushima reactors, best described as airborne particles or aerosols for 131I, 137Cs, and 35S, and subsequent atmospheric monitoring showed it coming in contact with the North American continent at California, with greatest exposure in central and southern California. Government monitoring sites in Anaheim (southern California) recorded peak airborne concentrations of 131I at 1.9 pCi m−3