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These refined dispersion models are listed in Appendix W (PDF)(45 pp, 803 K, About PDF) and are required to be used for State Implementation Plan (SIP) revisions for existing sources and for New Source Review (NSR) and Prevention of Significant Deterioration (PSD) programs. The models in this section include the following:
AERMOD Modeling System - A steady-state plume model that incorporates air dispersion based on planetary boundary layer turbulence structure and scaling concepts, including treatment of both surface and elevated sources, and both simple and complex terrain.
CALINE3 - A steady-state Gaussian dispersion model designed to determine air pollution concentrations at receptor locations downwind of highways located in relatively uncomplicated terrain.
CAL3QHC/CAL3QHCR - CALINE3 based CO model with queuing and hot spot calculations and with a traffic model to calculate delays and queues that occur at signalized intersections.
CTDMPLUS - A refined point source gaussian air quality model for use in all stability conditions for complex terrain.
OCD - A straight line Gaussian model developed to determine the impact of offshore emissions from point, area or line sources on the air quality of coastal regions.
Providence Oris, an Air Quality Modeling Consultant, offers innovative software for dispersion modeling studies or related air quality analysis and more. Screening Air Dispersion Model SCREEN View is a free software package and is designed for screening level air dispersion modeling. With conservative calculations and simplified input requirements, SCREEN View is ideal for initial screening runs.
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AERMOD Modeling System
The American Meteorological Society/Environmental Protection Agency Regulatory Model Improvement Committee (AERMIC) was formed to introduce state-of-the-art modeling concepts into the EPA's air quality models. Through AERMIC, a modeling system, AERMOD, was introduced that incorporated air dispersion based on planetary boundary layer turbulence structure and scaling concepts, including treatment of both surface and elevated sources, and both simple and complex terrain.
There are two input data processors that are regulatory components of the AERMOD modeling system: AERMET, a meteorological data preprocessor that incorporates air dispersion based on planetary boundary layer turbulence structure and scaling concepts, and AERMAP, a terrain data preprocessor that incorporates complex terrain using USGS Digital Elevation Data. Other non-regulatory components of this system include: AERSCREEN, a screening version of AERMOD; AERSURFACE, a surface characteristics preprocessor, and BPIPPRIM, a multi-building dimensions program incorporating the GEP technical procedures for PRIME applications.
At this time, AERMOD does not calculate design values for the lead NAAQS (rolling 3-month averages). A post-processing tool, LEADPOST (ZIP)(65 M), is available to calculate design values from monthly AERMOD output. This tool calculates and outputs the rolling cumulative (all sources) 3-month average concentration at each modeled receptor with source group contributions and the maximum cumulative (all sources) rolling 3-month average concentration by receptor.
Below is the model code and documentation for AERMOD Version 19191. The model code and supporting documents are not static but evolve to accommodate the best available science. Please check this website often for updates to model code and associated documents. As of December 9, 2006, AERMOD is fully promulgated as a replacement to ISC3, in accordance with Appendix W (PDF).
| AERMOD Modeling System Code and Documentation |
|---|
| AERMOD Implementation Guide |
| AERMOD Implementation Guide (PDF)(39 pp, 346 K, 2019) - Provides information on the recommended use of AERMOD for particular applications and is an evolving document. |
| Model Code |
| Executable (v19191) (ZIP)(1.4 M, 2019) - 64-bit Operating Systems Executable (v19191) (ZIP)(1.2 M, 2019) - 32-bit Operating Systems Source Code (v19191) (ZIP)(535 K, 2019) |
| Model Documentation |
AERMOD Quick Reference Guide (PDF)(6 pp, 55 K, 2019) Model Change Bulletin #14 - Version Date 19191 (PDF)(5 pp, 178 K, 2019) |
| Test Cases |
| AERMET-AERMOD Test Comparisons (XLSX)(984 K, 2019) AERMOD Test Cases (ZIP)(290.8 M, 2019) |
| Installation Guide (Sample Run) |
Read Me (TXT)(1 K, 2014) - please read this file first AERPLOT Sample Run Instructions (PDF)(5 pp, 589 K) - detailed installation and execution instructions |
| Model Supporting Documents |
Model Evaluation Paper (PDF)(41 pp, 1 M, 2005) |
| Model Evaluation Databases |
| README (TXT)(1 K) - Document that explains the databases below that contain input and output data for the model evaluation AGA (ZIP)(2 M) - Input/output data for AGA: Flat, Rural, Downwash, Independent Alaska (ZIP)(661 K) - Input/output data for Alaska: Flat, Rural Downwash, Developmental Baldwin (ZIP)(4.5 M) - Input/output data for Bladwin: Flat, Rural, Non-downwash, Independent Bowline (ZIP)(2 M) - Input/output data for Bowline: Flat, Rural, Downwash, Developmental/Independent Clifty Creek (ZIP)(3.5 M) - Input/output data for Clifty Creek: Flat, Rural , Non-downwash, Independent DAEC (ZIP)(1 M) - Input/output data for DAEC: Flat, Rural, Downwash, Developmental EOCR (ZIP)(4 M) - Input/output data for EOCR: Flat, Rural, Downwash, Independent Indianapolis (ZIP)(1 M) - Input/output data for Indianapolis: Flat, Urban, Non-downwash, Developmental Kincaid SF6 (ZIP)(3 M) - Input/output data for Kincaid SF6: Flat, Rural, Non-downwash, Developmental Kincaid SO2 (ZIP)(5 M) - Input/output data for Kincaid SO2: Flat, Rural, Non-downwash, Developmental Lee Wind Tunnel (ZIP)(13 M) - Input/output data for Lee Wind Tunnel: Flat, Rural, Downwash, Independent Lovett (ZIP(9 M) - Input/output data for Lovett: Terrain, Rural, Non-downwash, Developmental Martin's Creek (ZIP)(11.5 M) - Input/output data for Martin's Creek: Terrain, Rural, Non-downwash, Independent Millstone (ZIP)(660 K) - Input/output data for Millstone: Flat, Rural, Downwash, Developmental Prairie Grass (ZIP)(342 K) - Input/output data for Prairie Grass: Flat, Rural, Non-downwash, Developmental Tracy (ZIP)(2.5 M) - Input/output data for Tracy: Terrain, Rural, Non-downwash, Independent Westvaco (ZIP)(10 M) - Input/output data for Westvaco: Terrain, Rural, Non-downwash, Independent |
CALINE3
CALINE3 is a steady-state Gaussian dispersion model designed to determine air pollution concentrations at receptor locations downwind of highways located in relatively uncomplicated terrain. CALINE3 is incorporated into the more refined CAL3QHC and CAL3QHCR models.
| CALINE3 Model Code and Documentation |
|---|
| Model Code |
| Code/Executable/Test Case (ZIP)(442 K) |
| Model Documentation |
| User's Guide - Unabridged (PDF)(184 pp, 7.6 M, 1979) User's Guide - Abridged (PDF)(34 pp, 108 K, 1979) Latest Model Change Bulletin (TXT)(6 K, 1989) |
CAL3QHC/CAL3QHCR
CAL3QHC is a CALINE3 based CO model with queuing and hot spot calculations and with a traffic model to calculate delays and queues that occur at signalized intersections; CAL3QHCR is a more refined version based on CAL3QHC that requires local meteorological data. Both models are available below.
| CAL3QHC/CAL3QHCR Model Code and Documentation |
|---|
| Model Code |
CAL3QHCR Executable (ZIP)(917 K) |
| Model Documentation |
| CAL3QHC User's Guide (PDF) (98 pp, 2.4 M, 1995) Latest CAL3QHC Model Change Bulletin (TXT)(5 K, 2004) CAL3QHCR User's Guide (PDF)(96 pp, 209 K, 1995) Latest CAL3QHCR Model Change Bulletin (TXT)(3 K, 2013) |
CTDMPLUS
Complex Terrain Dispersion Model Plus Algorithms for Unstable Situations (CTDMPLUS) is a refined point source gaussian air quality model for use in all stability conditions for complex terrain. The model contains, in its entirety, the technology of CTDM for stable and neutral conditions. CTSCREEN is the screening version of CTDMPLUS.
| CTDMPLUS Model Code and Documentation |
|---|
| Model Code |
| Model Documentation |
| User's Guide Supplement (PDF)(5 pp, 60 K, 1993) User's Guide, Volume 1 (PDF)(210 pp, 7 M, 1989) User's Guide, Volume 2 (PDF)(77 pp, 2 M, 1990) User's Guide for Terrain Preprocessor (PDF)(180 pp, 6 M, 1988) User's Guide for Meteorological Preprocessor (PDF)(166 pp, 5 M, 1989) Final Report (PDF)(484 pp, 16 M, 1987) Latest Model Change Bulletin (TXT)(5 K, 1993) |
Best Dispersion Modeling Software
OCD
Offshore and Coastal Dispersion Model Version 5 (OCD) is a straight line Gaussian model developed to determine the impact of offshore emissions from point, area or line sources on the air quality of coastal regions. OCD incorporates overwater plume transport and dispersion as well as changes that occur as the plume crosses the shoreline. Hourly meteorological data are needed from both offshore and onshore locations.
| OCD Model Code and Documentation |
|---|
| Model Code |
Code/Executable (ZIP)(9 M) |
| Model Documentation |
| User's Guide (ZIP)(369 M) User's Guide Supplement (PDF)(204 pp, 3 M, 1989) Latest Model Change Bulletin (TXT)(6 K, 2000) |
Modeling Software Free
This page lists some known alternative models to the perferred/recommended models listed in the Guideline on Air Quality Models, Appendix W that can be used in regulatory applications with case-by-case justification to the Reviewing Authority (Section 3.2 of Appendix W). However, inclusion here does not confer any unique status relative to other alternative models that are being or will be developed in the future. The models in this section include ADAM, ADMS-3, AFTOX, ASPEN, BLP, CALPUFF, DEGADIS, HGSYSTEM, HOTMAC/RAPTAD, HYROAD, ISC3, ISC-PRIME, OBODM, OZIPR, Panache, PLUVUEII, SCIPUFF, SDM, and SLAB.
Epa Air Dispersion Modeling Software
| Alternative Models and Documentation |
|---|
| ADAM |
| Air Force Dispersion Assessment Model (ADAM) is a modified box and Gaussian dispersion model which incorporates thermodynamics, chemistry, heat transfer, aerosol loading, and dense gas effects. Release scenarios include continuous and instantaneous, area and point, pressurized and unpressurized, and liquid/vapor/two-phased options. |
| Model Code |
| Executables (ZIP)(271 K) |
| Model Documentation |
| Readme (TXT)(1 K) |
| ADMS-3 |
Atmospheric Dispersion Modeling System (ADMS-3) is an advanced dispersion model for calculating concentrations of pollutants emitted both continuously from point, line, volume and area sources, or discretely from point sources. The model includes algorithms which take account of the following: effects of main site buiding; complex terrrain; wet deposition, gravitational settling and dry deposition; short term fluctuations in concentration; chemical reactions; radioactive decay and gamma-dose; plume rise as a function of distance; jets and directional releases; averaging time ranging from very short to annual; condensed plume visibility; meteorological preprocessor. The modeling system is available at no cost in selected circumstances. Potential users should contact Dr. David Carruthers at 'David.Carruthers@cerc.co.uk' for information on acquiring the ADMS-3 modeling system. For additional information on the ADMS-3 Modeling System please link to the Cambridge Environmental Research Consultants Website. Exit |
| AFTOX |
| AFTOX is a Gaussian dispersion model that will handle continuous or instantaneous liquid or gas elevated or surface releases from point or area sources. Output consists of concentration contour plots, concentration at a specified location, and maximum concentration at a given elevation and time. |
| Model Code and Documentation |
| Executable/Test Case/Readme (ZIP)(173 K) User's Guide (ZIP)(26 K) |
| ASPEN |
| The Assessment System for Population Exposure Nationwide (ASPEN) consists of a dispersion and a mapping module. The dispersion module is a Gaussian formulation based on ISCST3 for estimating ambient annual average concentrations at a set of fixed receptors within the vicinity of the emission source. The mapping module produces a concentration at each census tract. Input data needed are emissions data, meteorological data and census tract data. The Emissions Modeling System for Hazardous Pollutants (EMS-HAP) is needed to process the emission inputs into the ASPEN model or the ISC3 model. The ASPEN model was used in estimating annual ambient concentrations for air toxics pollutant in the National Air Toxics Assessment (NATA) Study. |
| Model Code |
| ASPEN Modeling System (ZIP)(3.7 M) |
| Model Documentation |
| Descriptive Statement (PDF)(1 pg, 30 K) User's Guide (PDF)(110 pp, 1.5 M, 2000) |
The ASPEN model and the EMS-HAP Version 3.0 emission modeling system were used to estimate the ambient concentrations for the National-Scale Air Toxics Assessment for 1999. The 2005 results are available on the NATA website. The 1996 results using EMS-HAP Version 2.0 and the ASPEN model, are still available on the National Air Toxics Assessment (NATA) Archive Website. |
| BLP |
| BLP is a Gaussian plume dispersion model designed to handle unique modeling problems associated with aluminum reduction plants, and other industrial sources where plume rise and downwash effects from stationary line sources are important. |
| Model Code |
| Code/Executable/Test Cases/Post-processors (ZIP)(231 K) |
| Model Documentation |
| User's Guide (PDF)(206 pp, 5.8 M, 1980) User's Guide Addendum (PDF)(17 pp, 505 K, 1991) Model Change Bulletin (TXT)(1 K, 1999) |
| CALPUFF Modeling System |
CALPUFF is a multi-layer, multi-species non-steady-state puff dispersion model that simulates the effects of time- and space-varying meteorological conditions on pollution transport, transformation and removal. CALPUFF can be applied on scales of tens to hundreds of kilometers. It includes algorithms for subgrid scale effects (such as terrain impingement), as well as, longer range effects (such as pollutant removal due to wet scavenging and dry deposition, chemical transformation, and visibility effects of particulate matter concentrations). Download worldship ups. From April 2003 until January 2017, CALPUFF was the EPA preferred model for long-range transport for the purposes of assessing NAAQS and/or PSD increments. With the 2017 revisions to the Guideline on Air Quality Models (Appendix W to 40 CFR Part 51), the EPA has established in Section 4.2(c)(ii) a screening approach for long-range transport assessments for NAAQS and PSD increments. This screening approach will streamline the time and resources necessary to conduct such analyses and provides a technically credible and appropriately flexible way to use CALPUFF or other Lagrangian models as a screening technique. With the establishment of the screening approach for long-range transport, CALPUFF was delisted as an EPA preferred model in the 2017 revised Guideline. Should a cumulative impact analysis for NAAQS and/or PSD increments be necessary beyond 50 km, the selection and use of an alternative model shall occur in agreement with the appropriate reviewing authority and approval by the EPA Regional Office based on the requirements of Appendix W, Section 3.2. |
| Model Code |
The files associated with this system, e.g., executables/source code, preprocessors, associated utilities, test cases, selected meteorological data sets and documentation can be found on Exponent's website through the model component links below. Support documents related to CALPUFF can also be found on this website. Upon entering the Exponent website, you will see the CALPUFF Model listing on the left-hand panel. To access the system code, click on 'DOWNLOAD', then click on 'Skip Registration' if you do not want to register. The most recent EPA-Approved version of the CALPUFF Modeling System includes: For every update of the 'EPA-Approved' version of the CALPUFF Modeling System, a consequence analysis is performed by USEPA using an update protocol that identifies what model changes have been made and their implications based on the analysis results. This analysis compares the base CALPUFF Modeling System (i.e., current version) with the beta (i.e., proposed updated version). |
| Support Documents |
Previous SCRAM Website CALPUFF Modeling System Posting Reference (PDF)(4 pp, 40 K, 2018) Summary of Update Process (PPT)(40 pp, 3.5 M, 2005) A Comparison of CALPUFF Modeling Results To Two Tracer Field Experiments (PDF)(48 pp, 1 M, 1998) An Analysis of the Calmet/Calpuff Modeling System In A Screening Mode (PDF)(56 pp, 1 M, 1998) A Comparison of CALPUFF with ISC3 (PDF)(50 pp, 1 M, 1998) Application of CALMET/CALPUFF and MESOPUFF II to Compare Regulatory Design Concentrations for a Typical Long-Range Transport Analysis (PDF)(88 pp, 486 K, 2002) Peer Review of Calmet/Calpuff Modeling System (PDF)(40 pp, 1 M, 1998) Note: Part of Appendix F and all of Appendix G are unavailable in electronic form. Response to Peer Review Comments of Calmet/Calpuff Modeling System (PDF)(5 pp, 16 K, 1998) Technical Issues Related to CALPUFF Near-field Applications (PDF)(16 pp, 145 K, 2008) |
| DEGADIS |
| DEGADIS simulates the atmospheric dispersion at ground-level of area source dense gas (or aerosol) clouds released with zero momentum into the atmospheric boundary layer over flat, level terrain. The model describes the dispersion processes which accompany the ensuing gravity-driven flow and entrainment of the gas into the boundary layer. |
| Model Code |
| Executables (ZIP)(3.2 M) Source Code, NMAKE files, and Recompile Instructions (ZIP)(266 K) Test Cases, Batch Files, and Results for Comparison (ZIP)(334 K) |
| Model Documentation |
| Readme (PDF)(12 pp, 60 K) User's Guide (PDF)(419 pp, 9.6 M, 1989) Evaluation of Dense Gas Simulation Models (PDF)(114 pp, 3.5 M, 1990) Latest Model Change Bulletin (TXT)(1 K, 2012) |
| HGSYSTEM |
| HGSYSTEM is a collection of computer programs designed to predict the source-term and subsequent dispersion of accidental chemical releases with an emphasis on denser-than-air (dense gas) behavior. Available from NTIS, Order Number PB96-501960. |
| HOTMAC/RAPTAD |
| HOTMAC is a 3-dimensional Eulerian model for weather forecasting; RAPTAD is a 3-dimensional Lagrangian random puff model for pollutant transport and diffusion. These models are used for prediction of transport and diffusion processes for complex terrain, coastal regions, urban areas, and around buildings where conventional models fail. Available from YSA Corporation.Exit |
| HYROAD |
| The HYbrid ROADway Model (HYROAD) integrates three historically individual modules that simulate the effects of traffic, emissions and dispersion. The traffic module is a microscale transportation model which simulates individual vehicle movement. The emission module uses speed distributions from the traffic module to determine composite emission factors; spatial and temporal distribution of emissions is based on the vehicle operation simulations. The model tracks vehicle speed and acceleration distributions by signal phase per 10-meter roadway segment for use in both emissions distribution and for induced flows and turbulence. The dispersion module uses a Lagrangian puff formulation, along with a gridded non-uniform wind and stability field derived from traffic module outputs, to describe near-roadway dispersion characteristics. HYROAD is designed to determine hourly concentrations of carbon monoxide (CO) or other gas-phase pollutants, particulate matter (PM) and air toxics - in consultation with appropriate Reviewing Authority - from vehicle emissions at receptor locations that occur within 500 meters of the roadway intersections. |
| Model Code and Documentation |
| Executable/Test Case/README (ZIP)(13.5 M) Model Formulation (ZIP)(1.8 M) User's Guide (ZIP)(1 M) |
| ISC3 |
| ISC3 is a steady-state Gaussian plume model which can be used to assess pollutant concentrations from a wide variety of sources associated with an industrial complex. This model can account for the following: settling and dry deposition of particles; downwash; point, area, line, and volume sources; plume rise as a function of downwind distance; separation of point sources; and limited terrain adjustment. ISC3 operates in both long-term and short-term modes. The screening version of ISC3 is SCREEN3. ISC3 also uses the Emissions Modeling System for Hazardous Pollutants (EMS-HAP) to process an emission inventory for input into the model. The Building Profile Input Program (BPIP) and the Building Profile Input Program for PRIME (BPIPPRM) can also be used with ISC3 to correctly calculate building heights (bh) and projected building widths (pbw) for simple, multi-tiered, and groups of structures. For the status of ISC3 as a preferred model, please see the Note below. |
| Model Code |
| SHORT term (ISCST3) (ZIP)(1.7 M) LONG term (ISCLT3) (ZIP)(390 K) |
| Model Documentation |
| User's Guide, Volume 1 with Addendum (PDF)(390 pp, 1.4 M, 1990) User's Guide, Volume 2 with Addendum (PDF)(128 pp, 570 K, 1995) Latest Model Change Bulletin for SHORT term (ISCST3) (TXT)(29 K, 2002) Latest Model Change Bulletin for LONG term (ISCLT3) (TXT)(45 K, 1996) |
Note: The promulgation package which establishes AERMOD as the preferred air dispersion model in the Agency's 'Guideline on Air Quality Models' (Appendix W) in place of the ISC3 air dispersion model was signed by the Administrator of the US EPA on October 21. The package was then submitted to the Federal Register office and was published November 9, 2005. This rule becomes effective December 9, 2005. Beginning one year after this date, the new model - AERMOD - should be used for appropriate application as replacement for ISC3. During this one-year period, protocols for modeling analyses based on ISC3 which are submitted in a timely manner may be approved at the discretion of the appropriate Reviewing Authority. Applicants are therefore encouraged to consult with the Reviewing Authority as soon as possible to assure acceptance during this period. |
| ISC-PRIME |
| ISC-PRIME (Plume RIse Model Enhancements) is a model with building downwash incorporated into the Industrial Source Complex Short Term Model (ISCST3). |
| Model Code |
| Source Code (ZIP)(217 K) Executables (ZIP)(639 K) |
| Model Documentation |
| README (TXT)(8 K, 2004) User's Guide (PDF)(13 pp, 229 K, 1997) Model Evaluation: ISCST3 and ISC-PRIME (PDF)(162 pp, 262 K, 1997) - Graphics are not included in document. Complete copy is available from NTIS. (See README for ordering information.) Consequence Analysis - Available from NTIS (See README for ordering information.) Consequence Analysis for Adoption of PRIME: an Advanced Building Downwash Model (PDF)(7 pp, 22 K, 1998) and Associated Tables (PDF)(3 pp, 24 K, 1998) Consequences Analysis of Using ISC-PRIME over the Industrial Source Complex Short Term Model (PDF)(47 pp, 903 K, 1998) |
| Technical Papers |
| Development and Evaluation of the PRIME Plume Rise and Building Downwash Model (PDF)(5 pp, 19 K) Project PRIME: Evaluation of Building Downwash Models Using Field and Wind Tunnel Data (PDF)(4 pp, 32 K) Development and Evaluation of the PRIME Plume Rise and Building Downwash Model (PDF)(34 pp, 588 K) |
| OBODM |
| Intended for use in evaluating the potential air quality impacts of the open burning and detonation (OB/OD) of obsolete munitions and solid propellants. OBODM uses cloud/plume rise dispersion, and deposition algorithms taken from existing models for instantaneous and quasi-continuous sources to predict the downwind transport and dispersion of pollutants released by OB/OD operations. |
| Model Code |
| Executable/Test Case (ZIP)(524 K, February 9. 2010) Source Code (ZIP)(1 M) |
Model Documentation |
| README1 (TXT)(1 K) - install directions for version 1.3.24 README2 (TXT)(12 K) - errata and update by dates for version 1.3.24 User's Guide: Volume 1 (PDF)(196 pp, 460 K, 1998) User's Guide: Volume 2 (PDF)(58 pp, 328 K, 1998) User's Guide: Volume 3 (PDF)(24 pp, 40 K, 1997) - dated recompile instructions |
| OZIPR |
| OZIPR is a one-dimensional photochemical box model that is an alternative version of the OZIP model that deals with air toxic pollutants. |
| Model Code |
| Code/Executable/Test Inputs (ZIP)(907 K) |
| Model Documentation |
| README (TXT)(2 K, 2005) User's Guide (PDF)(43 pp, 183 K) Guidance Document (PDF)(120 pp, 4 M, 1989) - Procedures for applying City-Specific EKMA. Support Document (PDF)(78 pp, 3 M, 1999) - Also available from NTIS (TXT)(19 K) Appendix A (PDF)(17 pp, 126 K) Appendix B (PDF)(241 pp, 438 K) Appendix C (PDF)(241 pp, 437 K) Appendix D (PDF)(61 pp, 114 K) Appendix E (PDF)(25 pp, 70 K) Appendix F (PDF)(4 pp, 35 K) |
| Panache |
| Panache is an Eulerian (and Lagrangian for particulate matter), 3-dimensional finite volume fluid mechanics model designed to simulate continuous and short-term pollutant dispersion in the atmosphere, in simple or complex terrain. Available from Transoft US. Inc.Exit |
| PLUVUEII |
| A model used for estimating visual range reduction and atmospheric discoloration caused by plumes resulting from the emissions of particles, nitrogen oxides, and sulfur oxides from a single source. The model predicts the transport, dispersion, chemical reactions, optical effects and surface deposition of point or area source emissions. |
| Model Code |
| Code/Executable/Test Case (ZIP)(782 K) |
| Model Documentation |
| User's Guide (PDF)(116 pp, 4 M, 1992) User's Guide - Addendum (PDF)(24 pp, 900 K, 1996) Latest Model Change Bulletin (TXT)(5 K) |
| SCIPUFF |
| Second-order Closure Integrated PUFF Model (SCIPUFF) is a Lagrangian puff dispersion model that uses a collection of Gaussian puffs to predict three-dimensional, time-dependent pollutant concentrations. In addition to the average concentration value, SCIPUFF provides a prediction of the statistical variance in the concentration field resulting from the random fluctuations in the wind field. |
| Model Documentation |
| Model Overview (PDF)(5 pp, 18 K) |
| SDM |
| Shoreline Dispersion Model (SDM) is a multiple-point Gaussian dispersion model that can be used to determine ground level concentrations from tall stationary point source emissions near a shoreline. |
| Model Code |
| Code/Executable/Test Case (ZIP)(328 K) |
| Model Documentation |
| User's Guide (PDF)(222 pp, 4.7 M, 1988) Latest Model Change Bulletin (TXT)(2 K) |
| SLAB |
| The SLAB model treats denser-than-air releases by solving the one-dimensional equations of momentum, conservation of mass, species, and energy, and the equation of state. SLAB handles release scenarios including ground level and elevated jets, liquid pool evaporation, and instantaneous volume sources. |
| Model Code |
| Code/Executable/Test Case (ZIP)(111 K) |
| Model Documentation |
| Model User's Guide (PDF)(150 pp, 6.2 M, 1990) Evaluation of Dense Gas Simulation Models (PDF)(114 pp, 3.5 M, 1990) |