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Air Dispersion Modeling, Inc. - A firm in Oakton, Virginia selling a line of air pollution dispersion modeling software that includes: ISC View, RMP View, SCREEN View, SLAB View and SLAB View 3D ... all of which are U.S. EPA models adapted for use with Windows by Lakes Environmental.

Aircraft Exhaust Plume Model - The model PARANOX (PArametrization of Aircraft emitted NOX) was developed by the Netherlands Meteorological Institute to describe the chemical processes and dispersion of an aircraft exhaust plume at cruising altitudes.

The AirQUIS Model - The Norwegian Institute for Air Research (NILU) has developed an Air Quality Information System (AirQUIS) having: an emission inventory data base; dispersion models; and a geographical information system (GIS) module. The dispersion models include a source oriented model (EPISODE), a puff-trajectory model, and models for traffic in street canyons and on roads (ROADAIR and CONTILENK).

Adair Geneva Project - The APPH Module (Air Pollution and Public Health) integrates three different models in the Aidair Geneva system. The system was developed in Switzerland to draw maps of air pollution emissions from point sources (power plants, industries) and/or area sources (automotive traffic). The three dispersion models used are: a Gaussian model; a Lagrangian model; and a statistic model.

Xavier's Online Gaussian Dispersion Model - An online Gaussian dispersion model developed by Xavier Morales, a Ph.D. candidate in the City and Regional Planning Department at Cornell University in Ithaca, New York.

ATM-PRO - A distributor of air dispersion modeling and other environmental software located in Nivelles,Belgium.

BEE-Line Software - BEE-Line Software is located in Asheville, North Carolina, USA and markets air dispersion modeling software with training and technical support. They specialize in creating user-intuitive versions of EPA air dispersion models for application in the Windows environment.

BREEZE Software and Meteorological Data Services - BREEZE markets the software developed by Trinity Consultants of Dallas, Texas, USA. They offer air quality modeling software, meteorological data, training and support. Among the software packages offered are those based on the US EPA's ISC and AERMOD suites. Software for continuous releases, accidental toxic and flammable chemical releases, and explosion safety is available.

Cambridge Environmental Research Consultants - Scientific consultants in the field of atmospheric dispersion located in Cambridge, England.. They offer a range of air dispersion models including: ADMS 3 for dispersion of industrial emissions; ADMS-SCREEN for initial screening studies of emission dispersion; and GASTAR for dispersion of accidental dense gas releases.

Support Center for Regulatory Air Models - Extensive information from U.S. EPA on air pollution modeling software. Detailed description of mathematical models, guidance and other technical papers.

EnviroModeling Ltd. - EnviroModeling Ltd. is based in Santiago, Chile and provides visual software for meteorological and air quality needs: CalDESK - display and analysis software for the CALPUFF modeling system, and CAMxDESK - graphical analysis software for the CAMx photochemical model.

CAMEO - Computer-Aided Management of Emergency Operation (CAMEO) is a software package developed by NOAA (U.S. National Oceanic and Atmospheric Administration) and U.S. EPA (Environmental Protection Agency), for planning responses to chemical accidents. Includes the ALOHA (Areal Location of Hazardous Atmospheres) dispersion model for neutrally buoyant or heavier-than-air gases.

ARIA Technologies - A French firm of environmental consultants and developers of air dispersion modeling software ranging from small-scale local models to industrial models to regional models.

Engineering Technology, Inc. - A research and development firm based in Orlando, Florida, USA and that has developed the TDR dispersion model (Transport, Diffusion, and Radiance) using Gaussian plume and puff methodology to model the transport and dispersion of single or multiple atmospheric releases in a variety of environmental conditions and complex terrain features.

Online Version of SCREEN3 Model - This site is maintained by Pacific Environmental Services (with nationwide offices in the USA) who developed an online version of the U.S. EPA's SCREEN3 air dispersion model, which is freely available for use by any visitor to the site.

The CADiP-3D Model - Simulates the dispersion of pollutants in complex topography, and was developed by the Thermodynamics Department of the University of Munich in Germany. It solves the equations for the conservation of energy, momentum and mass (for air and pollutants) and the ideal gas equation of state, by using the method of finite elements. The program works on unequally-spaced, three-dimensional rectangular grids.

The DREAM Model - The Danish Rimpuff and Eulerian Accidental release Model (DREAM), developed by the National Environmental Research Institute (NERI) of Denmark, is a high-resolution, three-dimensional tracer model for short and large scale atmospheric transport, dispersion, and deposition (wet and dry) of radioactive air pollution from a single strong source.

Federal Aviation Administration's Dispersion Modeling Program - Discusses the EDMS (Emissions and Dispersion Modeling System) developed by the U.S.'s Federal Aviation Administration (FAA) and how to order copies.

Environmental Software and Services GmbH - A software development and research company based in Austria who offer the AirWare integrated system which includes: an emissions database; data management for inputs from external meteorological and air quality monitors; the U.S. EPA's ISC2 and ISC3 short-term and long-term air dispersion models; a geographical information system (GIS) module; and assessment and reporting modules.

EXSIM - A mathematical model that predicts the overpressure (explosion) generated by the accidental release and ignition of a gas cloud in a congested area of an industrial plant onshore, or offshore on oil drilling platforms. The model was developed by Shell Oil Global Solutions in England and by the Telemark Technological R&D Center (Tel-Tek) in Norway.

The FLACS Model - FLACS (FLame ACceleration Simulator) is an advanced tool for the modeling of ventilation, gas dispersion, vapour cloud explosions and blast in complex process areas. It was developed by GexCon AS of Norway.

Online Version of Tox-Flam Model - Provides an online version of the Tox-Flam model for the use of any visitor to this website. Tox-Flam is a Gaussian dispersion model for releases of inert buoyant pollutants into a finite mixing layer of a user-specified height. The model was developed by Enviroware s.r.l.

Hazard Prediction and Assessment Capability (HPAC) - HPAC models the release to and transport of materials in the atmosphere and its impact on civilian and military populations. Contains weather interface, supporting infrastructure and probabilistic solutions (i.e., "How good is the prediction"). Licensing from the U.S. Defense Threat Reduction Agency is available for non-commercial usage.

HGSYSTEM - HGSYSTEM is a suite of programs for assessing the dispersion of vapor from gas, liquid or two-phase releases. HGSYSTEM was first developed to model the release of Hydrogen Fluoride and ideal gases, and then extended to include multicomponent mixtures. The original development work was led by Shell Research Ltd. as part of a consortium of 20 petroleum and chemical companies.

ImmProg2000 Dispersion Models - A set of dispersion models developed by AirInfo Gmbh, Switzerland to meet the recommendations of the Swiss and German meteorological services. All of the models are Gaussian and they include: a point-source model; a line-source model for vehicles on roads in open terrain and in city street canyons; and an odor dispersion model.

The Indic-Airviro System - The Swedish Meteorological and Hydrological Institute (SMHI) developed a dispersion modeling system with modules for: receiving input data from monitoring stations; an emission data base; and dispersion modeling. The dispersion module has a Gaussian model for small-scale applications, a grid model for large-scale regional applications, a street canyon model for emission sources surrounded by buildings, and a dense gas module.

Lakes Environmental - Located in Ontario, Canada, this firm provides easy-to-use air dispersion and risk assessment modeling software for Windows. Their air pollution dispersion modeling software includes: ISC-AERMOD View, RMP View, SCREEN View, and SLAB View, all of which are U.S. EPA models adapted for use with Windows. Training and technical support are also provided.

The MIDAS Models - Dispersion models, offered by PLG Inc. (located in Bethesda, Maryland), for routine and accidental airborne releases of hazardous materials. Versions available for: industrial releases of hazardous chemicals; nuclear facility radioactive releases; and response to chemical or biological releases by terrorists. Built-in dense gas and evaporation plume models. Real-time displays of the dispersing plume on site-specific maps.

The Sophware Group - Based in Toronto, Canada, the Sophware Group develops and markets a range of environmental software, including the sophMOD dispersion modeling workbench for many of the US EPA and Ontario dispersion models.

The OML Model - A Gaussian plume model developed by Denmark's National Environmental Research Institute (NERI) that is recommended for environmental impact assessments of any planned new industrial sources. The model can be used at distances up to 20 km for high or low sources, one or more point sources, or area sources. It is not suitable for complex terrain and it requires input data on emissions and meteorology on an hourly basis.

Online Gaussian Dispersion Model - The Industrial Hygiene website consists of specialized online calculators for the occupational safety and health professional, including an online Gaussian dispersion model which is freely available for use by site visitors.

The SAFE-AIR System - The system, developed in Italy and distributed by FiatLux Publications of Fremont, California, has two parts: a meteorological preprocessor to compute the wind field; and a Gaussian dispersion model modified to more accurately simulate both non-stationary and non-homogeneous conditions. FiatLux Publications is a partner of The Envirocomp Institute, an Internet-based network of environmental scientists and engineers.

The PHAST Software - Developed by Det Norske Veritas (DNV) of Oslo, Norway, the PHAST software includes: a unified dispersion model (UDM) for various accidental releases; modeling of Bleves, jet fires, pool fires and vapor cloud explosions; handling of multicomponent mixtures; and an online help system. Upgrades and technical support are provided.

YSA Atmospheric Modeling - Yamada Science & Art Corporation (YSA), located in Santa Fe, New Mexico, USA, specializes in computer modeling of atmospheric airflows and the dispersion of airborne materials over complex terrain. YSA developed, markets, and provides user support for the three-dimensional atmospheric models HOTMAC and RAPTAD.

SCIPUFF Model - The Titan Systems Corporation is a technology research and development group headquartered in San Diego, California and serving the U.S. defense and intelligence communities. The group has developed a Lagrangian puff dispersion model known as the SCIPUFF model.

The TRACE Software - Developed by Safer Systems L.L.C. of Camarillo, California, the TRACE software includes: source terms for time-varying and for steady flow releases; dispersion modeling for buoyant and for dense plumes; and modeling fires and explosions such as Bleves, pool fires, jet fires and flash fires. Technical support and training are available.

A Dispersion Model for Coastal Zones and Complex Terrain - A description of the research program in the Mechanical Engineering Department at the University of Hong Kong that led to the development of a comprehensive air dispersion model for use in coastal zones and complex terrain such as exists in the Hong Kong area.

KOVERS - Developed by the Swiss Federal Institute of Technology Zurich (more commonly known as ETHZ), KOVERS is an Integrated Decision Support System (IDSS) software program. One of its applications is in the investigation and/or evaluation of chemical or nuclear accidents. KOVERS includes a module for air dispersion modeling in complex terrain.

The PlantSafe System - Developed by GeoSphere Systems located in Doylestown, Pennsylvania, USA, the PlantSafe System is a rapid decision-support tool for managing a variety of critical situations including accidental releases and similar plant emergencies. It includes an air dispersion model called QuikPlume.

The ALOHA Model - The Areal Location of Hazardous Atmospheres model (ALOHA) was developed by the USA's National Oceanic and Atmospheric Administration (NOAA) for use in emergency responses to accidental releases of neutrally buoyant or heavier-than-air gases.

The SLAB model - This software models the dispersion of dense gas releases from an evaporating pool, a horizontal jet, a vertical jet, or an instantaneous volume source. The dispersion is calculated from the conservation equations of mass, momentum, energy, and species. The conservation equations are spatially averaged to treat the cloud as either a continuous plume, a transient puff, or a combination of the two depending on the release duration. SLAB was developed by the USA's Lawrence Livermore National Laboratory.

The DEGADIS model - Dr. Tom Spicer and Dr. Jerry Havens of the University of Arkansas developed this model (for the U.S. Coast Guard and the Gas Research Institute) primarily for simulating the dispersion of denser-than-air flammable gases. The U.S. EPA later extended DEGADIS for dispersion modeling of vertical jets. Implementation of DEGADIS on personal computers was sponsored by the Gas Research Institute and the American Petroleum Institute.

The RITE Emergency Response System - The RITE Emergency Response is a collection of tools and weather models designed to assist emergency response personnel in predicting the flow and dispersion of toxic releases into the atmosphere. It incorporates 3D wind field and air dispersion models, developed by ARIA Technologies of France, as well as site-specific topographic data.

The CAPARS System - Developed by AlphaTRAC, the Computer-Assisted Protective Action Recommendation System (CAPARS) provides plume extent, weather, hazard, and related information needed to support all levels of emergency management and response to an accidental release of hazardous gas. AlphaTRAC is located in Westminster, Colorado, USA.

Petersen & Kade - A firm located in Hamburg, Germany which markets air dispersion modeling software that meets the standards developed by: the Association of German Engineers (Verband Deutscher Ingenieure, or simply VDI), and by Germany's Federal air pollution control regulations (known as TA Luft).

The LASAT model - Developed by Janicke Consulting (located in Danum, Germany), the Lagrangian Simulation of Aerosol Transport (LASAT) model utilizes stochastic processes to simulate numerically the transport and turbulent diffusion of a group of representative particles. LASAT has a preprocessor which calculates the meteorological profiles and three-dimensional wind fields required for the simulations.

The Oklahoma Dispersion Model - A simple model developed at the Oklahoma State University (in the USA) to assess the atmosphere's ability to disperse gases and particulates released at near ground level. The focus of the model is to evaluate downwind pollutant concentrations at distances of 1/4 mile to 2 miles (although greater distances would apply).

The QuickSLAB Model - Integrates the SLAB dispersion model with a mapping system of potential toxic release points, types and quantities and exposed schools, homes, hospitals and businesses. It was developed for use by National Border Technology Partnership Program (NBTPP), led by the U.S. Department Of Energy, in addressing environmental and health concerns along the U.S.A and Mexico border.

The Disperse Model - A Gaussian air dispersion model available as a Microsoft Excel spreadsheet from P&I Design Limited, a process design consultancy based in Stockton-on-Tees, England.

The NAME dispersion model - The Nuclear Accident Model (NAME) is an essential part of the contingency plans for accidental releases of radioactivity into the atmosphere: to provide early warning for emergency response and to predict concentrations, depositions and dosages of radionuclides. Use of the model is administered by the National Meteorological Centre of the United Kingdom's Meteorological Office at Bracknall, Berkshire, UK.

The AUSPLUME Model - Describes the AUSPLUME model developed in about 1986 by the Environmental Protection Authority of Victoria, Australia. The AUSPLUME model is an adaptation of the U.S. EPA's ISCST model (Industrial Source Complex Short Term model). Copies of the model can be purchased from the Victorian Environmental Protection Authority.