2.0 DOCUMENT BACKGROUND AND PURPOSE
2.1 BACKGROUND (10/19/07)
In April 2005, the AERMOD Implementation Workgroup (AIWG) was formed in anticipation of
AERMOD’s promulgation as a replacement for the Industrial Source Complex (ISCST3) model.
AERMOD fully replaced ISCST3 as the regulatory model on December 9, 2006 (EPA, 2005a),
after a one-year grandfather period. The primary purpose for forming the AIWG was to develop
a comprehensive approach for dealing with implementation issues for which guidance is needed.
A result of this initial AIWG was the publication of the first version of the AERMOD
Implementation Guide on September 27, 2005.
In 2007, a new AIWG was formed as a standing workgroup to provide support to EPA’s Office
of Air Quality Planning and Standards (OAQPS). This document represents the combined
efforts of AIWG and OAQPS in relation to the implementation of the AERMOD regulatory
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