In the context of this "Air Dispersion Modeling/Software" category, air dispersion modeling software may be defined as computerized mathematical calculations for predicting the dispersion behavior of air pollutants emitted into the atmosphere. The many types of air dispersion models include those for modeling: the continuous emission of buoyant pollutant plumes; the non-continuous accidental releases of either buoyant or heavier-than-air (i.e., dense gas) pollutants; puff emissions; point-source emissions; area-source or line-source emissions; mobile transportation-source emissions; fire and smoke emission models; etc. Air quality modeling software for urban airsheds are probably best placed in the "Air Quality" category rather than in this "Air Dispersion" category. Sources for air dispersion modeling software include governmental agencies, research institutes, university faculty and post-graduate students, environmental consultants, industrial dispersion modeling practitioners, and pollution meteorologists.

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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).
AJ Design Software
AJ Design Software is located in Albuquerque, New Mexico, USA and their web site has a number of free, online calculators for solving various atmospheric dispersion modeling algorithms.
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.
Canarina Algoritmos Numericos
Environmental software developers, located in Tenerife, Canary Islands, Spain, and whose products include an air pollution dispersion modelling program called DISPER.
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.
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.
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).
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.
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 research and development Center (Tel-Tek) in Norway.
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.
The FLACS Explosion 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.
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.
Lakes Environmental
Located in Ontario, Canada, this firm provides easy-to-use air dispersion modeling, emissions inventory and risk assessment software for Windows. These include AERMOD View, CALPUFF View, Emissions View, IRAP-h View and SLAB View. Software support and training are also available.
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.
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 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.
Safer Systems
Offers SAFER, an advanced plume measurement and monitoring solution that integrates real-time weather and sensor data. Technical support and training are available.
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.
Soft Fund Ltd.
EOL-2000 is an integrated system for the evaluation of air pollution produced from industrial sources. It provides full-functional modelling environment. Implements OND-86 regulatory dispersion model. English shareware version is available.
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.
YSA Atmospheric Modeling
Yamada Science and 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.
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