According to remarks included with CTBTO data recently released by the United Nations Scientific Committee on the Effects of Atomic Radiation, the total iodine-131 in the air was up to 500% of the amount shown.
CTBTO Particulate air monitoring data (.xls file), July 2014: The PTS [Provisional Technical Secretariat] itself issued a number of comments and caveats on the data:… “Since the IMS stations use paper filters to collect the particulate radionuclides in the air, part of the iodine in gaseous form passes through the filter easily. It is estimated that only 20-50% of total iodine (from all forms) was collected in the samples.”
Of the more than 1,500 measurements in the CTBTO data taken since Fukushima began, iodine-131 levels detected in Florida were the highest of anywhere in the world outside of Japan. Florida also recorded 4 of the top 10 daily measurements.
Before the U.N. made this data public, an ENENews report from April 2011 noted that for the specific date of March 22, Florida recorded the highest I-131 level of any CTBTO monitoring station in the world. See: Melbourne, Florida had highest iodine-131 reading of any CTBTO monitoring station in the world from March 22-23 (CHART)