air dispersion modeling Articles
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Effects of concentration fluctuations on statistical evaluations of centreline concentration estimates by atmospheric dispersion models
An investigation is undertaken of a concept expressed in a draft Guide under construction, which recommends that evaluation data having similar meteorological and physical conditions be grouped together, the modelling results and observations be separately averaged and that the evaluation shall consist of a comparison of the respective averages. It is determined that, even though large ...
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ADMS–Urban: developments in modelling dispersion from the city scale to the local scale
Many countries perform national air quality assessments using grid–based numerical air dispersion models, generally referred to as 'regional' models. Advantages of these models include the ability to use temporally and spatially varying meteorology and model chemical reactions over large temporal and spatial scales. These models usually perform reasonably well against rural and urban background ...
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BREEZE is the market-leading air dispersion modeling software used by environmental professionals around the world
While most air dispersion modeling is conducted using meteorological data from recent past years and historical or projected emissions data, models can also be used with real-time or short-term forecast meteorological and emissions data to estimate impacts at the present time and in the near future. In order to develop these custom real-time air dispersion modeling and forecasting systems, ...
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Comparison between the Chinese EIA Guidelines for Air Dispersion Modelling and the Advanced Air Dispersion Model ADMS
According to the Environmental Protection Law of P.R. China, and the Environmental Protection Management Method on Construction Projects the Technical Guidelines for Environmental Impact Assessment (EIA) (HJ/T .1~2.3-93) have defined how environmental impact assessment should be carried out for construction projects, in terms of the general principle, methodology, contents and requirements. ...
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Significance of a CALPUFF Near-Field Analysis
Historically CALPUFF air dispersion modeling has been a useful tool for determining ambient concentrations, regional haze, and deposition in Class I areas for Prevention of Significant Deterioration (PSD) applications. Until recently, CALPUFF has not been utilized by minor sources for small permitting projects or for near- field regulatory analyses due to the costs encountered from the complexity ...
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ALL4 Air Quality Modeling Update
As it’s been over a year since my last air quality modeling-related 4TR article, I thought it appropriate to provide a general status report on the air quality modeling updates that have occurred over the last year. There are a number of items that warrant discussion around their updates and the potential impacts on the regulated community, specifically: A new version of U.S. ...
By All4 Inc.
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CALPUFF View - Changing the Default Text Editor
Most air dispersion models use simple text files for reading inputs and writing output data. To display these files, Lakes Environmental’s applications use the system’s default text editor. Users may prefer to use a different text editor to utilize different functionality or format data differently. To take advantage of these additional features, you can change the default text editor ...
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`Sensitivity Analysis Study Considering the Selection of Appropriate Land-Use Parameters in AERMOD Modeling Analyses,` presented at the 2004 AWMA annual conference
Abstract In the near future AERMOD PRIME will officially replace the Industrial Source Complex Short-Term model, Version 3 (ISCST3) as the preferred Environmental Protection Agency (EPA) air dispersion model. Unlike the ISCST3 model that requires the simple selection of urban or rural default settings, the AERMOD dispersion model has a meteorological pre-processor (AERMET) that requires the ...
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Sensitivity Analysis Study Considering the Selection of Appropriate Land-Use Parameters in AERMOD Modeling Analyses
In the near future AERMOD PRIME will officially replace the Industrial Source Complex Short-Term model, Version 3 (ISCST3) as the preferred Environmental Protection Agency (EPA) air dispersion model. Unlike the ISCST3 model that requires the simple selection of urban or rural default settings, the AERMOD dispersion model has a meteorological pre-processor (AERMET) that requires the input of ...
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Sensitivity Analysis Study Considering the Selection of Appropriate Land-Use Parameters in AERMOD Modeling Analyses
In the near future AERMOD PRIME will officially replace the Industrial Source Complex Short-Term model, Version 3 (ISCST3) as the preferred Environmental Protection Agency (EPA) air dispersion model. Unlike the ISCST3 model that requires the simple selection of urban or rural default settings, the AERMOD dispersion model has a meteorological pre-processor (AERMET) that requires the input of ...
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New Air Permitting Requirements Finalized for Class I Areas
Issued in December 2000, the Federal Land Managers' Air Quality Related Values Work Group (FLAG) Phase I report set new visibility requirements and adjusted air dispersion modeling values, presenting new challenges for facilities near Class I areas. The report resulted from an interagency work group comprised of U.S. Fish and Wildlife Service, National Parks Service, and United States Department ...
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Statistical evaluation of centreline concentration estimates by atmospheric dispersion models
Within the American Society for Testing and Materials (ASTM), a standard practice (Z6849Z1) is being developed to provide an objective statistical procedure for comparing air quality simulation modelling results with tracer field data. The practice is limited to steady state, local-scale transport from isolated point sources in simple terrain. Evaluation data having similar external conditions ...
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A journey through time
A long, long time ago, BC (Before Computers), in galaxies far away (Houston), I worked as an environmental specialist in industry. Later, I began my second career at an environment, health, and safety (EH&S) management consulting company. In the mid- 1980s, someone “discovered” the personal computer (PC). The only people lucky enough to have PCs were the company bookkeeper, the chief financial ...
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ADMS and ADMS-Urban
ADMS and ADMS-Urban are new generation air quality models that are easy to use and attractively presented. They run on a PC under Windows and are suitable for modelling of industrial and urban dispersion problems for comparison with limits, planning, and 'what if' scenarios. Each model can be linked to a GIS (geographical information system) for simple entry of sources and clear presentation of ...
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Comparison of Two Dispersion Models: A Bulk Petroleum Storage Terminal Case Study
In 65 FR 21506 (dated April 21, 2000), the United States Environmental Protection Agency (U.S. EPA) proposed revisions to its air dispersion modeling guidance, found in 40 CFR 51, Appendix W (“Guideline on Air Quality Models”) that included replacing the Industrial Source Complex (ISC) model with the American Meteorological Society (AMS) / EPA Regulatory Model (AERMOD) as the regulatory default ...
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Comparison of Two Dispersion Models: A Bulk Petroleum Storage Terminal Case Study
In 65 FR 21506 (dated April 21, 2000), the United States Environmental Protection Agency (U.S. EPA) proposed revisions to its air dispersion modeling guidance, found in 40 CFR 51, Appendix W (“Guideline on Air Quality Models”) that included replacing the Industrial Source Complex (ISC) model with the American Meteorological Society (AMS) / EPA Regulatory Model (AERMOD) as the regulatory default ...
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`Comparison of Two Dispersion Models: A Bulk Petroleum Storage Terminal Case Study,` presented at AWMA 2004 annual conference
Abstract In 65 FR 21506 (dated April 21, 2000), the United States Environmental Protection Agency (U.S. EPA) proposed revisions to its air dispersion modeling guidance, found in 40 CFR 51, Appendix W ("Guideline on Air Quality Models") that included replacing the Industrial Source Complex (ISC) model with the American Meteorological Society (AMS) / EPA Regulatory Model (AERMOD) as the regulatory ...
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Air dispersion modelling for individual exposure studies
The concentration fluctuations of a dispersing hazardous gaseous pollutant in the atmospheric boundary layer, and the hazard associated with short–term concentration levels, demonstrate the necessity of estimating the magnitude of these fluctuations using predicting models. To predict and estimate the maximum expected dosage and the exposure time within which the dosage exceeds certain health ...
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Characterising uncertainty in plume dispersion models
For management decisions related to effects of releases of toxic chemicals, it is useful to consider not only the expected or most likely impact of the release, but also the envelope of possible outcomes, the latter of which involves an assessment of the uncertainty in the modelling results. In this paper, we provide quantitative estimates of major sources of uncertainty in plume dispersion ...
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Six technologies that shaped EH&S
This year, the Air & Waste Management Association celebrates its centennial. The past 100 years have yielded remarkable technological advances, especially in the area of information technology (IT). Within our professional lifetimes, we have shifted from using manually typed memos and reports, pink telephone message slips and pagers to computer-generated reports, Internet data exchange, e-mail, ...
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