Air Dispersion Modeling
The Indiana Department of Environmental Management's Office of Air Quality (IDEM OAQ) requires air dispersion modeling to be conducted to demonstrate that a source will not cause or significantly contribute to the violation of air quality standards. Modeling also must comply with the Prevention of Significant Deterioration (PSD) increments, or toxic thresholds. IDEM follows all air quality modeling procedures set forth in the U.S. Environmental Protection Agency (EPA) Guideline on Air Quality Models for PSD, nonattainment New Source Review (NSR), and State Implimentation Plan (SIP) revisions.
- IDEM Air Quality Modeling Policies - This document is currently under revision and is not available from our web site. As soon as the revisions have been completed, we will post the new policies. If you should have any questions concerning modeling, please contact Ken Ritter at 317-233-5682.
- Meteorological Data - Map of the state with links to download specific meteorological data.
- National Ambient Air Quality Standards (NAAQS) Inventory [ZIP - 1.2MB] - Statewide inventory of NAAQS sources for refined modeling.
- PSD Inventory [XLS - 186KB] - Statewide inventory for refined modeling.
- Background Concentrations [XLS - 48KB] - Background Concentrations from monitors over the last three years.
- US E.P.A.'s Support Center for Regulatory Air Models - Contains guidance, users manuals and information for models.
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