Trace levels of radioactive iodine-131 have now been detected in air, drinking water, rainwater and milk in Idaho, the state DEQ, Department of Agriculture and Department of Health & Welfare report in a joint news release, but "the levels detected are far below levels of public health concern." The I-131, from the nuclear disaster in Japan, first was detected on March 21 in an air sample in Boise. Mark Dietrich, the Idaho DEQ's emergency response program coordinator, said, "At no point have detected levels come close to levels of concern." You can read more here.