Proposed Changes to Modeling Guidance Available for Public Comment
Posted: 05/29/2013

The DNR is updating several dispersion modeling guidance documents to provide additional clarification on some aspects of the guidance, and to provide updates in response to recent changes in federal modeling guidance and requirements. These updates include:

It is the DNR’s goal that these revisions will provide improved modeling guidance to applicants submitting projects that include emissions of NO2, SO2, and PM2.5. These updates affect the following documents:

The draft documents are available for informal public review on the DNR – Air Quality Bureau’s Public Input webpage under “Other Air Quality Items.”

Please send written comments to Brad Ashton by email to, by fax to 515-242-5094, or by mail or hand delivery to DNR Air Quality Bureau, 7900 Hickman Road, Suite 1, Windsor Heights, Iowa, 50324. The DNR must receive all comments by 4:30 p.m., June 3, 2013.