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As a result of the incident with the Fukushima nuclear plant in Japan, several EPA air monitors have detected very low levels of radioactive material in the United States consistent with estimates from the damaged nuclear reactors. EPA says that these detections were expected and the levels detected.

Elevated levels of radioactive material in rainwater are a result of the nuclear incident after the events in Japan since radiation is known to travel in the atmosphere - precipitation samples collected by EPA in the states of California, Idaho and Minnesota have seen elevated levels of radiation.

In addition to iodine-131, EPA monitors have also identified trace amounts of other isotopes - - consistent with releases from the damaged Japanese nuclear reactors. (EPA)

Results from these precipitation samples