New versions of AERMOD and AERMET (14134) were released on May 16, 2014. EPA posted a summary of the changes on EPA's Support Center for Regulatory Air Quality Models (SCRAM) website. IDNR reprocessed the 2005-2009 meteorological data sets using the new version of AERMET and posted the new data on the IDNR's website ("F" version). The new meteorology data is not expected to significantly impact model results (less than one percent) based on sensitivity tests conducted. For more information, click here.