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This action will establish the initial air quality designations for the 2012 PM2.5 national ambient air quality standard for counties in Florida where these designations were deferred. On December 18, 2014, when the EPA established the initial designations for most areas of the country, the EPA deferred taking action on all counties in the state of Florida because it could not determine using available air quality data whether the areas were meeting or were not meeting the NAAQS, but for which forthcoming data would likely result in complete and valid data needed to determine a designation. On August 30, 2016, the EPA designated 62 of 67 counties in Florida based on data from 2013-2015. Following the August 30, 2016, designation action, five counties remained deferred in Florida due to continued air quality data issues. At this time, the EPA has sufficient data to designate certain remaining deferred counties in Florida based upon data from 2015-2017.