Or not:
Radiation from Japan not likely to harm North - Wunder Blog ...Some of the plumes move over eastern Siberia, Alaska, Canada, the U.S., and Mexico in 5 - 7 days. Such a long time spent over water will mean that the vast majority of the radioactive particles will settle out of the atmosphere or get caught up in precipitation and rained out. It is highly unlikely that any radiation capable of causing harm to people will be left in atmosphere after seven days and 2000+ miles of travel distance. Even the Chernobyl nuclear disaster, which had a far more serious release of radioactivity, was unable to spread significant contamination more than about 1000 miles.
Jeff will have another post later today. He knows his stuff.
AdvancedNano provides a handy
Radiation Chart. Living on the Colorado Plateau is worse for you than having a chest X-Ray.

Meanwhile we can be continue to be poisoned with homebrew toxins of all sorts:
MODFLOW in action at a Superfund Site in California | GroundwaterGo BlogRight next door, the Montrose Chemical Plant manufactured chemical products from 1947 to 1983, including DDT pesticide. Soils and groundwater in the vicinity are contaminated with DDT and the plant discharged DDT-laced waste water to local sewers, contaminating drainage channels and ocean sediments.2
Beneath these two facilities, soil and groundwater are polluted with industrial by-products, including chlorobenzene, DDT, parachlorobenzene sulfonic acid, benzene, ethylbenzene, naphthalene, trichloroethylene, perchloroethylene, and dichloroethylene. These substances are present beneath the facility as non-aqueous phase liquids (NAPL), dissolved in groundwater, and adsorbed to soils, and, if left untreated, these pollutants could pose a possible threat to the public.
But they're
our poisons! USA #1! Well, sort of. YT:
China Celebrates Status As Number One Polluter.