The U.S. Environmental Protection Agency (EPA) sets National Ambient Air Quality Standards (NAAQS) to protect public health and welfare. The NAAQS define the maximum acceptable concentrations of certain air pollutants, and thereby the amount of air resources that must be shared by all industrial facilities and other sources of those pollutants.
When the Iowa Department of Natural Resources (DNR) receives an air quality construction permit application, there may be a determination, through computer-aided air dispersion modeling, of the concentration of air pollutants in the ambient air near the facility. This includes any impact the facility may have as well as impacts from nearby facilities. The DNR compares these impacts to the NAAQS to ensure that public health is protected, and summarizes this information in the form of an Availability of Air Resources (AAR) Summary.
When available, an AAR Summary is provided to permit applicants upon permit issuance. The applicant can then use the AAR Summary for planning purposes and to assist in the preparation of future permit applications. AAR Summaries may also be requested using the contact information on this page.