Dispersion Modeling

• General Guidance
• PSD Modeling Guidance
• Source Characterization Guidance/Tools

• Dispersion Modeling Guidelines
• Air Dispersion Modeling Checklist |
• DNR Suggested Methodology for Modeling Restricted Hours of Operation
• EPA memo: Ambient Air
• EPA memo: Guidance for 1-hour NO2 NAAQS
• GEP Technical Support Document
• Use of the Ambient Ratio Method for Modeling Significant NO2 Impacts
• Rounding of Modeled Concentrations for Comparison with the NAAQS

• PSD Modeling Guidelines
• Modeling Protocol Template |
• Soils and Vegetation Analysis Tool
• VISCREEN Tool
• Air Quality Criteria for Oxides of Nitrogen - Vegetation Impacts
• "A Screening Procedure for the Impacts of Air Pollution Sources on Plants, Soils, and Animals" (EPA 450/2-81-078, December 1980)
• Screening Threshold Method for PSD Modeling

 The source characterization guidance was initially developed to assure consistency in the methodologies used by DNR staff to characterize emission sources in an air dispersion modeling analysis. In general the guidance addresses those emission sources modeled as pseudo- or non-point sources; however the guidance also addresses stacks with capped or horizontal type discharge. This guidance is not intended to preclude other methodologies for characterizing emission sources.

• Bin Vents
• Concrete Batch Plants
• Dump Pits
• Flare Guidance
• Flare Tool
• Grain Dryers
• Haul Roads
• Rain Caps and Horizontal Stacks
• Storage Piles
• Storage Tanks
• Truck or Rail Loadouts
• Volume Source Tool
• Volume Source Characterization

Data

• Meteorological Data (Pre-processed)
• Elevation Data (Pre-processed)
• Background Data

Useful Offsite Links

• SCRAM (EPA's Support Center for Regulatory Air Models)
• CHIEF (EPA's Clearinghouse for Inventories & Emission Factors)
• USGS (United States Geological Survey)
• NCDC (National Climatic Data Center)