No nuclear health risk from Japan to U.S. residents?

Federal and state officials sought Friday to dispel fears of a wider danger from radioactivity spewing from Japan's crippled nuclear reactors, saying testing indicated there were no health threats in California or along the West Coast.

Driven by winds over the Pacific Ocean, a radioactive plume released from the Fukushima Daiichi reached Southern California on Friday, heightening concerns that Japan's nuclear disaster was assuming international proportions.

However, the results of testing reflected expectations by International Atomic Energy Agency officials that radiation had dissipated so much by the time it reached the U.S. coastline that it posed no health risk whatsoever to residents.

http://www.mercurynews.com/california/ci_17648903?nclick_check=1

"[A] radioactive plume . . . reached Southern California on Friday . . . [h]owever . . . it posed no health risk whatsoever to residents"?

"[N]o health risk whatsoever to residents"?

I don't believe it.