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.

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.

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.

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.

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.

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

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 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.

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.

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.

OSPM is a street pollution model, developed by the National Environmental Research Institute, Department of Atmospheric Environment of Denmark. A free evaluation version of OSPM with a Windows user interface can be downloaded.

A three-dimensional Lagrangian model for dispersion over complex terrain. It was developed in Greece by the Environmental Research Laboratory (EREL) which is part of the Greek National Center for Scientific Research (DEMOKRITOS).

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.

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.

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

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 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.

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.

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.

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.

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.

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).

An integrated model (offered by ODOTECH of Montreal, Canada) which includes a choice of mapping, meteorological data input and editing, and Gaussian or Puff dispersion modeling from point, line or area sources.

An emission factors model (as per the German Emission Factors Handbook) coupled with a Gaussian air dispersion model, PROKAS is used to calculate air pollutant concentrations caused by automotive traffic on a network of streets. Documentation is available from Lohmeyer Consulting Engineers of Karlsruhe, Germany.

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.

Extensive information from U.S. EPA on air pollution modeling software. Detailed description of mathematical models, guidance and other technical papers.

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).

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.

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.

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.

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.

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 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.

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.

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.

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.

Dispersion models, offered by ABS Consulting (from their office in Bethesda, Maryland, USA), for routine and accidental airborne releases. Versions available are: quick-running plume model, urban dispersion model and inside building model. Real-time displays of the dispersing plume on site-specific maps.

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.

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).

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.

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.

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 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.

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.

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.

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.

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.