AdvertisementAirborne Radiation Poses Minuscule Risk For U.S.March 17, 2011facebookEmailA white cloud rises from reactors at the stricken Fukushima Dai-ichi nuclear power plant on Wednesday. Though the gas contains radiation, experts say any plume that travels out over the ocean won't be of much risk to the West Coast of the U.S. (DigitalGlobe)