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 (U.S. EPA) Guideline on Air Quality Models for PSD, nonattainment New Source Review (NSR), and State Implementation Plan (SIP) revisions.
- An Assessment of the American Meteorological Society/U.S. EPA Regulatory Model’s (AERMOD’s) Accuracy: A Case Study [PDF]
- A comparison between monitored and modeling values at the Duke Gibson power plant.
- Meteorological Data:
- Map of the state with links to download specific meteorological data.
- National Ambient Air Quality Standards (NAAQS) Inventory [XLS]
- Statewide inventory of NAAQS sources for refined modeling.
- PSD Inventory [XLS]
- Statewide inventory for refined modeling.
- Background Concentrations [XLS]
- Background Concentrations from monitors over the last three years.
- U.S. EPA Support Center for Regulatory Air Models
- Contains guidance, users manuals and information for models.
- Air Quality Modeling Policies [PDF]
- Contains PSD modeling guidance for sources that are required to do modeling.
- Hazardous Air Pollutants (HAPS) Table [XLS]
- Contains thresholds for acute and chronic risk for HAPS.