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MSES Consultants - An environmental consulting firm providing services in the areas of planning, engineering, safety, industrial hygiene, the earth and environmental sciences, design and regulatory assistance. The firm is located in Clarksburg, West Virginia, USA.

Applied Modeling Inc. (AMI) - Consultants (in Woodland Hills, California, USA) who offer services in: dispersion modeling (using ISCST3 model); regional air quality modeling (for ozone and for particulate matter); urban airshed modeling; and accidental release modeling (using ALOHA, CAMEO, SLAB, DEGADIS and SCREEN models).

DNV - Det Norske Veritas (DNV), headquartered in Oslo, Norway, is an international consulting firm with numerous offices worldwide. Their primary focus is on safety, environmental, risk management, and consequence analyses using their own PHAST dispersion modeling software.

GexCon AS - A consulting group in Norway that uses a program called FLACS to model the dispersion of leaks (on offshore oil drilling platforms)as well as their subsequent ignition and explosion. Far field blast effects (up to two kilometers away) from such explosions can also be modeled.

Bison Engineering, Inc. - An environmental engineering firm headquartered in Helena, Montana, USA, whose services include: air dispersion modeling; air emission inventories, air permit applications, and risk management plans (RMPs).

AirNova Inc. - Services include stack testing, stationary source isokinetic sampling, continuous emission monitoring, compliance permitting, air toxics pollution emission sampling, ambient air quality dispersion modeling. Located in Pennsauken, New Jersey, USA.

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.

Enviroware s.r.l. - These consultants, located in Italy, provide a number of air dispersion models. The site includes an online Gaussian dispersion model called Tox-Flam, for releases of inert buoyant pollutants into a mixing layer of a user-specified height.

AlphaTRAC Inc. - A consulting firm located in Westminster, Colorado, USA that offers atmospheric dispersion modeling including dense gases, hazardous releases and complex terrain.

Source Environmental Science - An environmental consulting firm, located in Houston, Texas, USA, whose air quality services include: air pollution dispersion modeling, air emission inventories, and air permitting.

McVehil-Monnett Associates - An air quality consulting firm, headquartered in Englewood, Colorado, USA with other offices in Arizona and Wyoming. Their services include air dispersion modeling for determining: ambient impacts for permitting industrial sources, impacts of cooling tower plumes, impacts of complex terrain on pollutant dispersion, mobile source impacts, and toxic air pollutant exposures.

Meteorological Solutions Inc. - Air quality consultants (located in Salt Lake City, Utah, USA) who provide a comprehensive range of air dispersion modeling services. The site includes links to the specifics of their various services as well as to a listing of the names, email addresses, and experience of their key people.

Tech Environmental Inc. (TEI) - Located in Waltham, Massachusetts, USA, TEI provides consulting for air quality and noise issues. Their services include: permit applications; siting and feasibility studies; environmental impact assessments; and technical support tasks such as air dispersion and noise modeling, planning, and monitoring.

MET Associates - A consultant firm in Dayton, Texas, USA that provides litigation support and expert witness testimony to environmental lawyers and to insurance companies for either plaintiffs or defendants in court cases that involve air dispersion and air quality modeling.

ENSR: Environmental Consultants and Engineers - A worldwide environmental service company (headquartered in Westford, Massachusetts, USA) that has developed: dispersion models that accommodate complex terrain and aerodynamic downwash; visibility models; hazardous air pollutant dispersion models; and others for facilities located in dispersion environments where standard models are inaccurate.

RTP Environmental Associates - RTP has offices nationwide in the USA and has performed modeling studies for: rural and urban locations; single-point sources; complex multi-source industrial sources; flat terrain; complex terrain; and time and spatial scales from short-term to multi-year analyses over distances of several meters to several hundred kilometers.

Dyadem International, Ltd. - A software development company in Toronto, Canada that also provides a full range of risk management consulting services. They offer software for Risk Analysis, Process Hazard Analysis (PHA), HAZOP, Failure Modes and Effects Analysis (FMEA), and Risk Management Plans (RMP).

North American Weather Consultants - Meteorological consultants (located in Salt Lake City, Utah, USA) who offer extensive experience in performing dispersion modeling for: simple, complex or intermediate terrain; single or multiple emission points; and buoyant or dense gas releases.

Earth Tech - A worldwide environmental consultant firm, headquartered in Long Beach, California, USA, whose modeling group are recognized experts in air dispersion modeling. They have developed or enhanced many models (CALPUFF, CALMET, CALGRID, BLP, ISC3, CTDMPLUS, OCD, and KSP), several of which are now U.S. EPA 'Guideline' models.

ENVIRON: Environmental Consultants - An international firm (headquartered in Novato, California, USA) offering services in: dispersion modeling of emissions from industrial plants and hazardous waste sites; air toxics impact studies; air pollution compliance assistance; emergency release modeling and consequence analysis; regional modeling of photochemical reactive plumes and of particulate matter; and visibility models.

Acu Tech - A nation-wide consultant firm (headquartered in San Francisco, California, USA) specializing in process safety and risk management services, training, and software. AcuTech makes use of these dispersion modeling programs: ALOHA, ARCHIE, DEGADIS, HGSYSTEM, SLAB, TSCREEN, and PHAST.

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.

WebMET - WebMET is a repository of meteorological data for air dispersion models such as ISCST3, ISC-PRIME and AERMOD, as well as for digital elevation terrain data. The data covers the entire United States and can be downloaded free of charge. The site is sponsored by Lakes Environmental located in Ontario, Canada.

E&A Environmental Consultants - A consulting firm, headquartered in Stoughton, Massachusetts, USA with other offices in the states of North Carolina and Washington, that utilizes air dispersion modeling as part of their services in odor abatement.

Grove Scientific Engineering - Environmental engineering consultants, located in Orlando, Florida, USA, whose services include: industrial air pollution studies, air permitting, emission inventories and air dispersion modeling.

Air Quality Services - Based in Evansville, Indiana, USA, with additional offices in the states of Tennessee and Florida, the Air Quality Services firm offers consulting services including air dispersion modeling, ambient air monitoring, air permitting and emission inventories.

Hastings Engineering, Inc. - Chemical and environmental consultants based in St. Louis, Missouri, USA whose services include air dispersion modeling used for: air permitting, accidental release modeling, and risk assessments.

Iris Environmental - Consulting and engineering firm based in Oakland, California , USA whose environmental management services include air dispersion modeling.

Zephyr Environmental Corporation - An environmental consulting firm, headquartered in Austin, Texas, USA, whose air dispersion modeling services include: simple and complex terrain modeling; line and mobile source modeling; and modeling of accidental dense gas releases. Zephyr utilizes U.S. EPA models such ISCST3 and SCREEN3; and public domain models such as SLAB and RMP-COMP.

EXSIM - Shell Oil and Tel-Tek offer consulting studies involving the EXSIM 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.

Imes Engineering Companies - Dispersion modeling services for: supporting existing air permits; compliance of new sources with ambient air standards; and offsite consequence analyses for RMP release scenarios. Models utilized include: U.S. EPA's ISCLT and ISCST for permit and other applications; and PHAST for determining flammable or toxic effects.

Aegis Environmental Inc. - Located in Richmond, Virginia, USA, the Aegis Environmental firm offers environmental consulting services including air dispersion modeling, offsite consequence analyses, air permitting and regulatory compliance strategies.

EnviroChem Engineering Consultants - Located in Wolfville, Nova Scotia, Canada, the EnviroChem Engineering Consultants firm offers chemical engineering services as well as environmental engineering services. Their environmental services include ambient air monitoring, stack sampling and air dispersion modeling using models such as ISC3, AFTOX, SLAB, CALINE3 and SCREEN3.

The Air Group - Consultants located in Dallas, Texas, USA who offer air permitting and compliance services, air dispersion modeling, and training workshops.

Geomet Technologies - A subsidiary of Versar Inc., Geomet Technolgies is an environmental services firm located in Germantown, Maryland, USA. The site contains a brief description of nine dispersion models: ALOHA, ARCHIE, BP CIRRUS, DEGADIS, SAFER, TRACE, HGSYSTEM, SLAB, and WHAZAN.

Northern Environmental and Monitoring Services (N.E.M.S.) - NEMS offers environmental, health and safety consulting services and their dispersion modeling expertise ranges from single stacks to multiple sources, spills and traffic pollution. NEMS uses the UK Atmospheric Dispersion Modeling System (ADMS). Their modeling has included: power plant emissions; cooling tower plume visibility; explosion risk assessments; and odor abatement.

Lehder Environmental Services - A Canadian consulting firm offering services in air dispersion modeling (including odor dispersion), stack sampling, and environmental permitting. Most of Lehder's modeling work for clients utilizes the U.S. EPA's Industrial Source Complex Short Term Model Version 3 (ISCST3).

Pacific Environmental Services (PES) - Nationwide company headquartered in Herndon, Virginia, USA. The PES modeling section specializes in developing, evaluating, and applying air pollution dispersion models. PES was involved in developing the U.S. EPA's dispersion models, such as ISC3, SCREEN3, and SCREEN. PES has also been involved in developing the new AERMIC Model (AERMOD), to be proposed by EPA as a regulatory model.

Air Resource Specialists Inc. - Located in Ft. Collins, Colorado, USA, this firm provides comprehensive air modeling, permitting, and compliance support to industrial, commercial, and government clients.

Risk Management Technologies - A firm located in Chennai, India offering: HAZOP training and software; air dispersion modeling; failure and reliability analysis; risk assessment; and accident investigation ... all targeted for the chemical process industries.

Wenck Associates - Consulting engineers based in Maple Plains, Minnesota, USA with multiple other offices in Minnesota. Their services include the use of air dispersion modeling for air permitting, regulatory compliance studies, air toxics evaluation, and New Source Reviews.

The Pilot Group - Consultants based in Dallas, Texas, USA who offer dispersion modeling services for: air toxic evaluations and risk assessments; demonstrating compliance with air quality standards; evaluation of accidental releases; stack height studies; new facility site selection; visibility studies, etc.

Atmospheric and Environmental Research (AER) - A nation-wide consultant firm, headquartered in Cambridge, Massachusetts, USA, whose air quality modeling services include model development, applications, customization and testing. Models developed and used by AER encompass such air quality issues as photochemical smog formation, particulate matter levels, atmospheric visibility degradation and acid deposition.

Enviros Aspinwal - An environmental consulting firm (based in Shrewsbury, Shropshire, UK) with multiple offices in the UK as well as other countries. Their air quality services include air dispersion modeling, emissions monitoring, and regulatory compliance audits.

Mike Lyons and Associates - Consultants located in Balwyn, Victoria, Australia. Services offered include air pollution plume dispersion modeling using the Australian EPAs latest "AUSPLUME" package as required under the State Environment Protection Policy (SEPP).

Aspen Environmental Group - An environmental consulting company based in Agoura Hills, California, USA whose services include air dispersion modeling and air quality impact assessments, air permitting, air toxics studies, and risk assessments.

Pollution Control Consultancy and Design - An acoustical and environmental engineering consulting firm based in Sydney, Australia that provides a range of services which includes air dispersion modeling.

Greenfield Environmental, Inc. - Environmental consultants with offices in Downers Grove, Illinois, USA and Maryland Heights, Missouri, USA. Air quality and air permitting services include air dispersion modeling using numerous EPA dispersion models (ISC, SCREEN, DEGADIS, PUFF, and FDM).

Pacific Air and Environment - A consultant group, headquartered in Brisbane, Australia with satellite offices in Melbourne and Sydney, who offer air quality modeling and emissions estimation services. The air dispersion models used include models developed in Australia (AUSPLUME, AUSPUFF and TAPM) as well as models developed in the USA (ISC3, AERMOD, CALPUFF and CALINE4).

The Weinberg Group - Environmental consultants with offices in Washington, DC and San Francisco, CA in the USA, Paris in France, and Brussels in Belgium. Services include atmospheric modeling and assessment.

Vision Environmental, Inc. - Environmental consultants based in Massachusetts and Michigan in the USA. Their services include the use of air dispersion modeling for risk assessments, air permitting, air toxics evaluations, and New Source Reviews.

Sanders Engineering & Analytical Services, Inc. - An environmental engineering firm based in Mobile, Alabama, USA that specializes in air permitting and air quality testing. Their air dispersion modeling includes the use of the U.S. EPA's ISC short and long term models, complex terrain modeling, and the Valley model.

Vector AS - Vector AS is based in Tønsberg, Norway and offers air dispersion modeling using WindSim, which is a flow and dispersion simulator for complex terrain using computational fluid dynamics (CFD).

Cambridge Environmental Inc. - A group of environmental consultants headquartered in Cambridge, Massachusetts, USA. Their services include the use of air dispersion modeling in support of health risk assessments.

Stantec - A consulting engineering firm based in Edmonton, Alberta, Canada with 40 offices across Canada and the USA. Their air quality services include the use of air dispersion modeling for risk assessments, offsite consequence analyses, regulatory compliance studies, and air permitting.

Davis & Floyd - A firm of engineering and environmental consultants based in Greenwood, South Carolina, USA whose services include air dispersion modeling for: air permitting, evaluating toxic air emission impacts, evaluating compliance with air quality standards, and risk assessments.

Conor Pacific - An environmental service firm headquartered in Vancouver, Canada with multiple offices in Canada, the United States and England. Their services include air dispersion modeling with in-house developed models and regulatory models to predict atmospheric impacts from sour gas and/or dense gas releases, deposition, and long range transport.

Westbrook Environmental Inc. - Located in San Diego, California, the environmental services offered by this firm include air dispersion modeling, offsite consequence analyses and risk assessments.

Dispersoft Consultants Inc. - A consulting firm headquartered in Sillery, Quebec, Canada, that offers service in air pollution dispersion modeling as well as other unrelated fields.

Epsilon Associates - An environmental engineering company based in Maynard, Massachusetts, USA whose services include air dispersion modeling for: risk management studies, offsite consequence analyses, and air emissions permitting.

National Environmental Technology Centre (NETCEN) - NETCEN is a subsidiary of AEA Technology Environment based in Culham, Abingdon, Oxfordshire, England, and offers a range of air quality and dispersion modeling services.

Theakston Environmental Control, Inc. - Environmental consultants located in Ontario, Canada whose services include physical modeling as well as computer modeling of stack exhaust gas dispersion and dust dispersion.

BlazeTech Corporation - Consultants (in Cambridge, Massachusetts, USA) with expertise in: air dispersion modeling, off-site consequence analysis, fire and explosion, and other safety problems. For dispersion modeling, the firm uses ADORA (Atmospheric Dispersion of Reacting Agents) ... a model with complex thermodynamics and chemical reactions.

Air Science Inc. - A consulting firm in Lakewood, Colorado, USA offering services in the air quality aspects of environmental impact studies, air quality and meteorological monitoring, dispersion modeling, visibility degradation analysis, and permitting of industrial facilities. The models utilized include SCREEN3, ISCST3, CALPUFF, VISCREEN, PLUVUE, and IWAQM.

Consulting Air Pollution Modelers - A consulting group (located in North Clayton, Victoria, Australia) who provide: air pollution dispersion and consequence modeling services; complex terrain modeling; meteorological services; and training in dispersion modeling. The models used include AUSPLUME, AUSTOX, TAPAS, TAPM, AUSPUFF/CALPUFF, ISC3.

EnviroMod.com Modeling - EnviroMod.com is a part of the Software Solutions & Environmental Services Company headquartered in St. Paul, Minnesota, USA. They offer a suite of services to environmental industry and government agencies concerned with local, mesoscale, and regional meteorological and air quality modeling as well as air pollution dispersion modeling.

Enviroplan Consulting - A consulting firm (headquartered in Fairfield, New Jersey, USA) that offers services in air dispersion modeling, air quality and meteorological monitoring, air pollution emissions estimation, permitting and compliance plans, hazard assessments and risk management plans.

TRC Environmental Corporation - Environmental engineers and consultants, based in Windsor, Connecticut, USA with multiple offices nationwide as well as offices in South America. Air dispersion modeling is used for air permitting and for evaluating: impact of accidental releases, compliance with ambient air quality standards, optional air pollution control systems, and impacts of toxic air pollutant emissions.

CES Environmental Company - A British consulting firm based in London, Birmingham and Manchester that offers air dispersion modeling services. The models used include: the U.S. EPA models AERMOD, ISC, and CALINE4; and the AAQuIRE 2000 model developed by CES and which incorporates source code from the AERMOD and the CALINE4 models.

Environmental Quality Management Inc. (EQ) - A consulting firm based in Cincinnati, Ohio (with multiple offices across the USA) that provides environmental engineering and air quality services including permitting, compliance studies, NSPS reviews, and air dispersion modeling.

EnCoCo - A firm headquartered in Lahaina, Hawaii, USA and offering air dispersion modeling software focused primarily upon the regulatory requirements of Germany.

Pinchin Environmental Ltd. - A consultant group based in Mississauga, Ontario, Canada (with multiple offices in Canada) who offer air dispersion modeling services. The dispersion models utilized include Ontario Regulation 346 as well as these U.S. EPA models: Screen3, ISCST3, AERMOD and PRIME.

Shell Engineering & Associates - Environmental management consultants located in Columbus, Missouri, USA. Their services include: air quality monitoring; air permitting; and air dispersion modeling involved in evaluating the offsite consequences of accidental releases and of air toxics emissions.

Air Consulting and Engineering Solutions (ACES) - Environmental engineering consultants located in Houston, Texas, USA whose services include air permitting, air pollution control, Clean Air Act compliance, and air dispersion modeling.

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.

Katestone Scientific Pty. Ltd. - Consulting firm based in Brisbane, Australia that offers air dispersion modeling services, using these models: AUSPLUME, AUSMET/AUSPUFF, LADM, TAPM, CALMET/CALPUFF, and the U.S. EPA's ISC models.

UAI Environmental, Inc. - An environmental engineering and consulting firm based in Reading, Pennsylvania, USA that offers a range of air dispersion modeling services using models such as: AERMOD, ISC3, CALMET, CALPUFF, CTDMPLUS, ALOHA and others.

Jim Clary & Associates - Consultants, based in Dallas, Texas, USA, who offer dispersion modeling services and a proprietary Air Modeling Organizational System (AMOS) designed to create input files and organize all of the ISCST modeling runs for an entire project.

Entech Engineering - A consulting firm based in Westboro, Massachusetts, USA who provide technical support and computer software to the nuclear power industry in the areas of radiological engineering, and atmospheric dispersion of radioactive effluents.

Stone Lions Environmental Corporation - A consulting firm headquartered in Rolling Hills Estates, California, USA who offer services in air dispersion modeling, toxic chemical exposure evaluations, reconstruction of past environmental exposures, and specialized software.

EnviroComp Consulting, Inc. - EnviroComp Consulting (based in Fremont, California, USA) develops and applies computational techniques to study environmental problems and, in particular, air pollution by using data analysis, simulation modeling, statistical methods, and advanced visualization.

Cermak Peterka Peterson Inc. (CPP) - A wind engineering consulting firm (located in Fort Collins, Colorado, USA) that offers wind tunnel modeling of pollutant transport and dispersion involving complex building and terrain situations.

RWDI Inc. - Rowan Williams Davies & Irwin Inc. (RWDI) are a Canadian firm of consulting engineers with offices in Guelph, Ontario and Calgary, Alberta. Their services include air emissions dispersion modeling and accidental release dispersion modeling using SCREEN3, AERMOD, ISCST3, ISC-PRIME, CALPUFF, SLAB, HGSYSTEMS and GASCON2.

NPN Environmental Engineers - Consulting environmental engineering firm located in St. Louis, Missouri, USA. Services include air dispersion modeling, air emission inventories, air permitting and compliance programs.

Payne Environmental Corp. - An environmental consulting firm (headquartered in Madison, Connecticut, USA) whose services include air permitting, emission inventories, dispersion modeling studies, and health risk assessments.

Stanger Science and Environment - Environmental consultants with multiple offices in England. Together with the University of Greenwich, Stanger operates a 24-hour telephone helpline for air dispersion modeling.

Exponent, Inc. - A firm of scientific and engineering consultants, headquartered in Menlo Park, California with multiple offices across the United States, whose services include air dispersion modeling.

D&E Technical - D&E Technical is an environmental engineering and software development company located in Champaign, Illinois, USA. Their services include air dispersion modeling and hazard analysis.

Janicke Consulting - A consulting firm located in Dunum, Germany who develop and market air dispersion modeling software, such as: LASAT, a Lagrangian dispersion model; IBJplume, a Gaussian model; IBJXodor; a model specifically for odor dispersion.

Castings Development Centre - A research/development/consultancy facility located in Sheffield, England that uses the ADMS-2 dispersion model to offer air pollution dispersion modeling services to the castings production industry.

Applied Environmental Consultants, Inc. - Consultants located in Tempe, Arizona, USA who provide air dispersion modeling in support of air quality permitting and impact analyses as well as air quality regulatory compliance.

Sullivan Environmental Consulting - This firm (located in Alexandria, Virginia, USA) offers services including urban scale air quality assessment, exposure assessment, permit support, air quality modeling, and risk management planning.

Ambient Air Services, Inc. - Located in Starke, Florida, USA, this firm's services include: air dispersion modeling; stack design and building downwash evaluations; toxic air pollution studies, model validation studies; and air quality impact analyses.

ABS Consulting Inc. - An international firm (headquartered in Houston, Texas, USA) providing engineering, science and technological services for identifying, analyzing and managing hazards, risk, and safety as well as minimizing environmental impacts. Their MIDAS air dispersion models are used in the nuclear, chemical, petroleum, electric power, space, defense, and transportation industries.

Sage Environmental Services - An environmental consulting company based in Texas (with offices in Richardson, Austin and Beaumont)who offer services in air dispersion modeling, air permitting and compliance, risk management plans and offsite consequence analyses.

Envirotest - An environmental consulting firm based in Brisbane, Australia offering services in Environmental Impact Assessments and Environmental Risk Assessments, including the use of the AUSPLUME air dispersion model.

Engineering, Compliance & Construction, Inc. - Environmental engineering consultants based in Little Rock, Arkansas, USA who utilize air dispersion modling in their air permitting services, compliance studies and air toxics studies.

IMC Technical Services Ltd. - A consultancy (part of the IMC Group), with multiple offices in England and elsewhere, whose services include air dispersion modeling, ambient air quality monitoring and stack emissions monitoring.

Power Technology - The engineering and scientific center of PowerGen UK plc. They use various models to simulate gas and dust dispersion from: industrial chimneys, stockpiles, fugitive sources, accidental releases, and cooling tower plumes. The models include: ADMS (Atmospheric Dispersion Modeling System), VISPACT (an in-house cooling tower model), MATADOR (UK acid rain model), MODELS-3 and U.S. EPA models.

P & I Design Ltd. - A chemical engineering and environmental management consultancy located in Stockton-on-Tees, England. They have developed a basic Gaussian dispersion model implemented with Microsoft's Excel spreadsheet program.

Aromatrix Pte Ltd - An odour control/abatement/design consultancy located in Singapore whose services include air dispersion modeling.

Weiss Associates - An environmental engineering, science and management firm headquartered in Emeryville, California, USA whose air quality services include air dispersion modeling.

ATMET - Environmental and meteorological consultants located in Boulder, Colorado, USA whose services include air pollution dispersion modeling, emergency response modeling, long range transport, and applied atmospheric research.

Liase Environmental, Inc. - A consulting firm based in Dallas, Texas, USA offering air quality permitting and related environmental services including air dispersion modeling.

Innovative Emergency Management, Inc. - A risk management company based in Baton Rouge, Louisiana, USA and offering software and consulting services nationwide. Included in their software offerings is D2-Puff, an air dispersion model developed specifically to predict the path and extent of plume resulting from the accidental release of hazardous chemicals.

Primatech, Inc. - A consulting firm based in Columbus, Ohio, USA and with multiple offices in North America. Their services include: process hazard analyses; source term calculations; air dispersion and consequence modeling; and probability modeling. They also market proprietary software for process hazard analysis (PHA) and safety management (PSM).

Environmental Risk Limited - An environmental consulting and engineering firm (located in Bloomfield, Connecticut, USA) whose air quality services include air emissions dispersion modeling, accidental release modeling, and cooling tower impact modeling.

Argent Consulting Services - An environmental engineering and consulting firm headquartered in Houston, Texas, USA and offering services in air dispersion modeling, air permitting and compliance, and risk management plans.

Vipac Engineers and Scientists - A company headquartered in Melbourne, Australia whose consulting services include air pollution dispersion modeling using models such as AUSPLUME, CALINE 4, MAXCON, RTDM and AIRPLAN.

ETS, Inc - An evironmental consulting, design and training company based in Roanoke, Virginia, USA whose services include air dispersion modeling, air permitting and compliances studies.

JBR Environmental Consultants - A regional consulting firm, headquartered in Sandy, Utah, USA and with other offices in the states of Nevada and Idaho, whose services include: air pollutant dispersion modeling, emission inventories, air permitting, and risk management.

MWH Global, Inc. - An international environmental consulting, engineering and construction company with headquarters in Broomfield, Colorado, USA that is a merger of Montgomery Watson with Harza Engineering. Their services include air dispersion modeling, air permitting and compliance, odor evaluation and control, risk assessments and management, and emission inventories.

Harding ESE - Headquartered in Golden, Colorado, USA, Harding ESE is a subsidiary of Mactec, Inc. (which has offices nationwide) and their dispersion modeling services include screening or refined analysis for point, area, or industrial sources in flat or complex terrain for use in air permitting and compliance, air toxics studies and assessing accidental release impacts.

Hamon-Custodis - Engineering firm (headquartered in Somerville, New Jersey, USA)that designs, constructs and maintains industrial chimneys and smokestacks. Their engineering services include air dispersion modeling. The firm is part of the Hamon Group (headquartered in Brussels, Belgium) with offices worldwide.

Conversion Technology Inc. - A firm of environmental, health and safety consultants based in Norcross, Georgia, USA whose services include air dispersion modeling, air permitting and compliance, and air toxics assessments.

NRG - A nuclear research, engineering and consultancy group with offices in Petten and Arnheim in the Netherlands. Their services include environmental and dose assessments of radionuclides using dispersion modeling in air, water and soil.

Compliance Partners, Inc. - An environmental consulting firm headquartered in Littleton, Colorado, USA (with other offices in Oklahoma and Wyoming) whose services include permitting, dispersion modeling, and developing and implementing compliance programs for the natural gas industry.

Arup Group Ltd. - Engineers and designers headquartered in London, England with offices worldwide. The Arup Environmental division uses the UK-ADMS, AERMOD and CALINE models to perform dispersion studies of air pollutant emissions from industrial sources and road traffic as well as odour emission studies and plume visibility studies.

PCR Services - An environmental consulting firm based in Southern California, USA, whose services include air dispersion modeling, stationary source permitting, and emission inventories, allotments, and mitigations.

Enitech - An environmental consulting firm, located at the Anyang University in Korea, whose services include the development of air dispersion modeling software (such as their Air Master).

Stephen Lamming Associates Limited - A Canadian environmental consulting company offering a range of services in environmental testing and approvals as well as dispersion modeling with: ISC3, ISCPRIME, AERMOD, AERMOD PRIME.

Stanley Environmental, Inc. - An environmental consulting firm based in Coraville, Iowa, USA and a subsidiary of the Stanley Group. Their services include air permitting, risk management plans, emission inventories and air dispersion modeling.

Air Noise Environment Pty. Ltd. - Environmental consultancy based in Brisbane, Australia specializing in stack emission testing and air dispersion modeling using AUSPLUME, CAL/AUSPUFF, ISC3, TAPM and AERMOD with particular emphasis on air dispersion from tunnels.

Keramida Environmental, Inc. - An environmental consulting firm based in Indianapolis, Indiana, USA whose air quality services include: emission inventories, air permitting, risk management plans, and air pollution dispersion modeling.

Fluent, Inc. - Headquartered in Lebanon, New Hampshire, USA with other offices nationwide and worldwide, this firm specializes in computational fluid dynamics (CFD) modeling. Their many services include atmospheric plume dispersion modeling.

The Chambers Group - An environmental consulting firm based in Irvine, California, USA whose range of services includes atmospheric dispersion modeling for: air toxics assessments, air permitting, compliance studies, and consequence analyses of accidental releases.

AEP Pro Services - A subsidiary of American Electric Power Company, based in Columbus, Ohio, USA, whose services include engineering, construction and consulting. Their air quality services group can provide air dispersion modeling, air toxics studies, emission inventories, and New Source Reviews.

Woodard and Curran - A multi-office environmental consulting firm headquartered in Portland, Maine, USA whose services include air dispersion modeling, air permitting and compliance, air toxics studies and risk management plans.

ENSCO, Inc. - Consulting engineers and scientists based in Springfield, Virginia and Melbourne, Florida with other nationwide offices on the USA. Atmospheric science services include air pollution dispersion modeling and developing customized dispersion models.

RPS Group Plc - An environmental consultancy based in England, with multiple offices in the UK, Ireland and Europe. Their Planning, Transport and Environmental division provides services in: dispersion modeling of industrial stack emissions, air emission impact studies, and emission authorization applications.

D'Appolonia S.p.A. - Engineering consultants and designers based in Genoa, Italy whose services include risk assessment studies and industrial air pollution dispersion modeling.

S.M. Stoller Corporation - An environmental consulting firm headquartered in Lafayette, Colorado, USA with other offices in Idaho, New Mexico and Texas. Their services include risk assessments and air pollution dispersion modeling.

Omni Environmental Associates - An environmental consulting firm based in Research Triangle Park, North Carolina, USA whose air quality services include air permitting, compliance studies and air dispersion modeling.

Trinity Consultants - A consulting firm based in Dallas, Texas, USA whose services include consulting, software, and training in the fields of air quality, dispersion modeling, permitting, compliance, Clean Air Act, environmental management information systems and industrial risk.

PPM Consultants Inc. - Environmental consultants based in the south and southeastern United States (Louisiana, Alabama, Mississippi and Florida) whose services include air dispersion modeling, air permitting, risk management plans, and emission inventories.

Conestoga_Rovers & Associates - An engineering, construction and environmental consulting firm based in Nottingham, England with 40 offices in Europe and North America. Their services include air pollution dispersion modeling in support of environmental impact studies as well as response planning for accidental releases.

General Physics Corporation - Based in Columbia, Maryland, USA (with other offices in Canada, South America, Europe and Asia), General Physics is a firm of scientists, technologists and engineers whose air emissions management services include air dispersion modeling in support of air emissions compliance studies, offsite consequence analyses, and evaluation/selection of emission stack heights.

Anvil Corporation - Engineering and design company headquartered in Bellingham, Washington, USA with other offices in the states of Washington, Montana and Alaska. Services include air dispersion modeling in support of air permitting, BACT and T-BACT analyses, and compliance studies.

EnviroMet - An air quality consulting firm located in Cherry Hill, New Jersey, USA, whose services include air permitting, air dispersion modeling, emissions estimation, site evaluations, regulatory analysis, and human health and ecological risk assessments.

Transoft International - A multinational company, based in St. Denis, France, offering technology solutions and consulting services in the field of computational fluid dynamics including air dispersion modeling for environmental impact studies, accidental releases, and risk assessments.