Air Dispersion Modeling
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Air Dispersion Modeling Web Site Links

Atmospheric Pollution Dispersion Modeling - Publicizes the book "Fundamentals Of Stack Gas Dispersion" ... a comprehensive single-source reference book on dispersion modeling of continuous, buoyant pollution plumes. Includes published peer reviews, complete Table of Contents, and information about how to obtain copies.

U.S. EPA's Support Center for Regulatory Air Models - The U.S. Environmental Protection Agency uses this site to provide information on the many dispersion models supporting regulatory programs required by U.S. law. All of the EPA's dispersion models and their Users' Manuals can be downloaded cost-free from here. An online forum is also provided for discussion/questions/answers on all aspects of the EPA's models.

Air Quality Control Company (AQCC) - Founded in 1993 by the Municipality of Tehran, Iran, the primary role of AQCC is providing research, consultation, planning and implementation of services regarding air and noise pollution in Tehran.

Certified Consulting Meteorologists - Provides directories by state and by speciality of the Certified Consulting Meteorologist members of the American Meteorological Society, many of whom specialize in air pollution dispersion modeling analyses and studies.

Risoe National Laboratory, Denmark - The Atmospheric Transport & Exchange section of the Risoe laboratory performs research into boundary-layer meteorology and atmospheric turbulence, and into environmental problems related to the transport of airborne pollutants. Typical research tasks are: dispersion of smoke puffs and plumes; dispersion of heavier-than-air plumes; and real-time dispersion modeling for emergency managing support.

Error Propagation in Air Dispersion Modeling - A sensitivity study of the Gaussian dispersion modeling of continuous, buoyant pollution plumes which illustrates how seemingly minor changes in some of the key variables can result in a propagated over-prediction factor ranging from 6 to 80.

Finnish Meteorological Institute - The activities of the Air Quality Research department at the Finnish Meteorological Institute (FMI) include atmospheric dispersion modeling for: urban air quality, regional and long-range transport, and accidents involving hazardous materials.

NOAA's Air Resources Laboratory (ARL) - Within the U.S.'s National Oceanic and Atmospheric Administration (NOAA), the ARL conducts research on the transport, dispersion, transformation, and removal of atmospheric pollutants ... leading to the development of air quality and dispersion models. The ARL also supports other U.S. agencies. In particular, the ARL's Atmospheric Turbulence & Diffusion Division (ATTD) and Atmospheric Sciences Modeling Division (ASMD) support the U.S. EPA in developing regulatory air dispersion models.

Atmospheric Research and Information Centre (ARIC) - Based at the Manchester Metropolitan University in the United Kingdom, ARIC is a research center for study of atmospheric pollution issues caused by industrial, power generation, and transportation sources. ARIC focuses on the basic elements of the science: emission characterization and estimation; ambient air monitoring; predictive modeling; and control technologies.

Old Dominion University and the ISC3 Dispersion Models - Describes a graphical user interface (GUI), developed by the Civil Engineering Department of the Old Dominion University, for using the U.S. EPA's ISC3 models in the Microsoft Windows environment. Presents an excellent discussion of the ISC3 models including: input requirements, dispersion options, source options, receptor options, meteorology options, and output options.

CSIRO's Atmospheric Pollution Program - The program is part of the Commonwealth Scientific and Industrial Research Organization (CSIRO) in Australia. Within the program, a Pollution Dispersion team: studies the Lagrangian theory of turbulent dispersion; conducts laboratory and field studies of convective boundary layer growth, turbulence, and dispersion; and develops advanced air dispersion models utilizing ideas from the Lagrangian theory studies and from the laboratory and field studies.

Calculating Accidental Release Flow Rates from Pressurized Gas Systems - This article presents and explains two published source-term models for calculating the time-dependent decrease in pressure, temperature and weight of gas in a pressurized gas system or vessel during an accidental release.

Atmospheric Dispersion Modeling Resources - A report published in 1995, "Atmospheric Dispersion Modeling Resources", can be downloaded from this site. It includes descriptions, contact people, and other details about 94 dispersion models. The report was developed by the: Subcommittee on Consequence Assessment and Protective Action (SCAPA), of the Emergency Management Advisory Committee, of the U.S. Department of Energy.

Literature References on Mesoscale Meteorology - A comprehensive list of literature references on mesoscale meteorology compiled by Dr. Ming Xue, many of which relate to various aspects of air dispersion modeling.

Pollution Meteorology and Dispersion - Publicizes the book "Air Pollution Meteorology and Dispersion" ... a review of the basic theories, models, experiments, and observations of pollutant dispersal in the atmosphere.

Literature References on Lagrangian Air Dispersion Modeling - A comprehensive list of literature references on Lagrangian air dispersion modeling, compiled by Dr. Marek Uliasz.

The GAIA Air Dispersion Model Database - A database of 27 different air dispersion models. Each model entry includes: a description, where to obtain the software, the original authors, and literature references pertaining to the model. Sponsored by a consortium of 10 countries in Europe, Africa, Asia and Latin America.

Radford's ADM/ERS System - The ADM/ERS is a leak detection, modeling, and emergency response system for the ammonia, oleum, nitric acid, and ether tank farms at the Radford Army Ammunition Plant in Virginia. The system has leak detection sensors, a system collecting continuous meteorological data, air dispersion models to determine the affected areas, and a system for notifying plant personnel and local communities of leaks.

UK Department of the Environment, Transport and the Regions (DETR) - "LAQM.TG3, Selection and Use of Dispersion Models" is one of the comprehensive Local Air Quality Management (LAQM) guidance documents published by the United Kingdom's DETR. This 67 page document can be read at this site or, by clicking on the LAQM index link, it can be selected for downloading in the Adobe Acrobat PDF format.

Multiplan R&F - Based in the Abu Dhabi, United Arab Emirates and with an office in Rueil-Malmaison,France, this firm's services include health, safety and environmental (HSE)training courses either online or onsite. Courses are available in air dispersion modeling, HAZOP's, quantitative risk assessment, and environmental management.

Dispersion Modeling Research at Madrid's Polytechnical University - Describes the dispersion modeling research programs of the Environmental Software and Modeling Group in the Computer Science School at the Polytechnical University in Madrid, Spain. Of interest is the IMW program which is a Visual Basic model based on the U.S. EPA's ISCT3 model that was developed by this group.

UCR Air Quality Modeling Group - The mechanical engineering department of the University of California at Riverside (UCR) has an air quality modeling group performing research in the development and application of small-scale dispersion models, as well as the development of simplified and comprehensive photochemical models.

Omni - Air Pollution Modeling In Practice - Omni is a demonstrator site for disseminating modeled and monitored air pollution data in an accessable form. Details of methodology are included. The data covers the London, England area.

Atmospheric Release Advisory Capability - Located at the University of California's Lawrence Livermore National Laboratory (LLNL), the Atmospheric Release Advisory Capability (ARAC) is a national emergency response service for real-time assessment of incidents involving accidental releases of nuclear, chemical, biological, or natural hazardous material. Additional information is available at

Canadian Modeling and Integration Division - Information on the models used and developed for research on the transport, transformation and deposition of atmospheric pollutants by this division of the Air Quality Research Branch, Meteorological Service of Canada

The Aerospace Corporation - The Environmental Systems division of the Aerospace Corporation has developed a model validation program (MVP) for improving the toxic hazard dispersion models used at space vehicle launch sites (Cape Canaveral in Florida and Vandenberg Air Force Base in California). Launch cloud and atmospheric tracer data collected by the MVP were used to test and upgrade the dispersion model predictions.

The Laboratory for Atmospheric Research - Located at the Washington State University (in Pullman, Washington, USA), the Laboratory for Atmospheric Research (LAR) investigates the fundamental nature of pollutant transport and dispersion through a combination of halogenated tracer field programs and advanced numerical modeling.

Air Pollution Modeling - Publicizes a book, "Air Pollution Modeling", written by P. Zannetti and published by WIT Press at the Wessex Institute of Technology in England. Includes an excerpt from a review by the American Meteorological Society.

U.S. EPA's Air Quality Modeling Group - The Group is responsible for leadership on the full range of the EPA's air dispersion models. It also serves as the focal point on modeling techniques for other EPA headquarters staff, Regional Offices, and State and local agencies. The names, email addresses and functions of all the key personnel in the Group are provided.

Los Alamos National Laboratory (LANL) Air Quality Team - The team is part of the Technology & Safety Assessment (TSA-4) Division of the LANL. The air quality team works with meteorological, air chemistry, plume dispersion, computational fluid dynamics, and emissions models. The site includes model descriptions as well as the names, email addresses and functions of all the key personnel.

Dispersion Modeling Feature Articles - This section of the site has a searchable index of feature articles concerning air pollution, including feature articles on dispersion modeling.

Atmospheric Dispersion Modeling Liaison Committee - A United Kingdom committee of members from government departments and agencies, nuclear industries and research organizations. The committee's purpose is to review current understanding of atmospheric dispersion and to identify suitable models for use primarily in authorization or licensing, in the context of atmospheric discharges from nuclear industry activities.

The CAPARS System - The Computer-Assisted Protective Action Recommendation System (CAPARS) is an integrated model for predicting the path and impacts of an atmospheric release of hazardous materials. It is used by a Regional Atmospheric Response Center (RARC) in Denver, Colorado, funded by the U.S. Dept. of Energy, to tell their staff where the plume will go, when it will arrive, how serious the impacts may be, and what protective actions to take.

AQM Resource Centre - The Air Quality Management (AQM) Resource Centre is maintained at the University of the West of England in Bristol, England. It provides much useful information, including brief descriptions of many British and USA air dispersion models.

Source Terms for Accidental Releases - Provides the source term equations (and how to use them) for calculating the flow rates from a number of different types of accidental gaseous releases.

The Nuclear Accident Model (NAME) - Developed by the United Kingdom's Meteorological Office, the NAME model is part of the contingency plans in the event of accidental releases of radioactivity into the atmosphere: to provide early warning for the guidance of emergency services; and to predict concentrations, depositions and dosages of radionuclides as input to impact assessments.

European Environmental Agency: List of Air Dispersion Models - An extensive list of European air dispersion models contained in an appendix of a report published by the European Environmental Agency headquartered in Copenhagen, Denmark.

Environmental Science and Technology Alliance Canada (ESTAC) - A Canadian alliance of industry, universities and government committed to sponsoring research and development, including the study of the AERMOD, ISCPRIME and ONTARIO REGULATION 346 air dispersion models on various types of air pollutant emission sources.

SCRAM Public Forum - The U.S. EPA's SCRAM website public discussion forum (moderated) for all aspects of the EPA's various air pollution dispersion models.

Stadt Klima (Urban Climate) - Site maintained by the "Internet Journal of Urban Climate" based in Germany. Provides a list of over 30 air dispersion models (and other related models) used in Germany and elsewhere in Europe. Also includes description of each model and how to contact each model developer/distributor.

Workbook on Atmospheric Dispersion Estimates - The revised second edition of D. Bruce Turner's book provides an understanding of dispersion modeling as currently practiced. The book and accompanying diskette explain: how to determine the impact of air pollution sources; the effects of wind, turbulence and plume rise; and Gaussian dispersion and its limitations.

Dispersion Modeling Conversions and Formulas - Provides a number of useful unit conversions and formulas pertaining to air dispersion modeling.

Logic Diagram For Using Briggs' Plume Rise Equations - This article chronicles the evolution of Briggs' plume rise equations and provides a logic diagram for using the Briggs equations to calculate the plume rise of bent-over buoyant plumes.

ETC-AQ Model Documentation System - The European Topic Center on Air Quality (ETC-AQ) has developed a consistent system for describing air dispersion models, which now encompasses over 90 European models. The ECT-AQ is led by the National Institute of Health and Environment (RIVM) in the Netherlands, and includes: the Norwegian Institute of Air Research (NILU), the Norwegian Meteorological Institute (DNMI), and the National Observatory of Athens (NOA) in Greece.

European Environmental Agency: Urban Air Dispersion Models - A discussion of the algorithms used in urban air dispersion models such as: area source and elevated point source models; street canyon and highway sub-models; plume rise; converting one averaging time to another ... all contained in an annex of a report published by the European Environmental Agency headquartered in Copenhagen, Denmark.

The CHARM Research Program - The George Mason University in Virginia has a research program called CHARM (Coordinated Hazardous Atmospheric Release Modeling). The focus of the program, funded by the U.S. Defense Department, is on atmospheric transport and dispersion of releases of nuclear, biological, and chemical agents. A wide range of available air dispersion models will be acquired and evaluated.