air regulation Articles
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Modeling Tip: How Parallel Processing can Expedite Large AERMOD Model Runs
Due to advances in scientific knowledge, higher resolution raw data, stringent air quality standards, and changing regulations, environmental modeling is demanding more and more from EHS professionals and their computers. All of these influences have resulted in significantly longer AERMOD model run times as compared to the predecessor regulatory model, ISCST. Instead of minutes, AERMOD runtimes ...
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Performance criteria for the benchmarking of air quality model regulatory applications: the 'target' approach
The definition of appropriate performance criteria is one of the key issues for the benchmarking of air quality models in regulatory applications. As part of the FAIRMODE benchmarking activities (Thunis et al., 2010), suitable criteria for air quality modelling in the frame of the EU air quality directive (AQD) 2008 are proposed and tested. The suggested approach builds on the target indicator ...
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New permitting requirements for sources in Indian country
In a June 10, 2011 signed rule (published in the Federal Register (FR) on July 1, 2011) , EPA finalized a Federal Implementation Plan (FIP) for “Review of New Sources and Modifications in Indian Country.” The rules, originally proposed by EPA on August 21, 2006, establish a minor New Source Review (NSR) program (minor preconstruction permits) and a major nonattainment NSR program for ...
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U.S. EPA Convenes RSL Modelers Workshop
On May 10 - 13, U.S. EPA met with regional, state, and local modelers in Portland, Oregon for the U.S. EPA Regional/State/Local (RSL) Modelers Workshop. Several “hot-topic” items were included on the agenda, most notably, the new NO2 and SO2 National Ambient Air Quality Standards (NAAQS). The regulated community was anticipating that further guidance related to Significant Impact ...
By All4 Inc.
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Not So Fast - Getting That Air Permit Won`t Be As Easy As You Think
Most of the air regulations promulgated by U.S. EPA are developed and implemented to achieve compliance with the National Ambient Air Quality Standards (NAAQS). The NAAQS represent ambient air concentration levels that are established by U.S. EPA to ensure that the general public and sensitive subgroups of the general public are not adversely affected by air pollution. The various NAAQS ...
By All4 Inc.
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GHG regulation under the clean air act – recent developments
EPA’s GHG Tailoring Rule and Senate Action On October 27, 2009, EPA published the Prevention of Significant Deterioration (PSD) and Title V Greenhouse Gas (GHG) Tailoring Rule in the Federal Register, followed by a 60-day public comment period that ended on December 28, 2009. The proposed rule represents EPA’s effort to decrease the number of sources subject to major source permitting ...
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Balancing simplicity with accuracy in the use of dispersion modelling in the United States
Dispersion modelling has been a requirement of air-quality regulatory agencies in the United States for over 20 years. Over the years, the task of performing this modelling has shifted from the regulatory agency to the applicant. One purpose of the modelling is to show that air-quality standards or air toxic guidelines will not be exceeded when the proposed modification or new facility is ...
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Atmospheric dispersion modelling for regulatory purposes in the United Kingdom
Short-range atmospheric dispersion models are used to assess the environmental impact of airborne pollutants from industrial plants. The results are of interest to a range of specialist and non-specialist groups, including regulators, operators, environmental organisations, and local residents. In order that these groups can be well-informed, it is important to develop clear and consistent ...
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Puzzle remains over source of Amazonian methane
Remote sensing observations have shown high methane concentrations in the troposphere above tropical forests in Venezuela and Brazil and scientists claim to have measured significant amounts of methane being emitted aerobically from the leaves of plants during photosynthesis. Recent experiments have been unable to reproduce these controversial results. Detailed knowledge of the global ...
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Developing new correlations and uncertainty analysis for the prediction of ground-level and maximum ground-level concentrations
The determination of Ground Level Concentration (GLC) and Maximum Ground Level Concentration (MGLC) is useful for the prediction of violations for air quality regulations. In this study, the predictions of GLC and MGLC when using different existing empirical formulas are analysed and the effect of dispersion parameters is investigated. Sensitivity analysis studies using both a first order and a ...
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Managing air quality during regulatory changes
This paper discusses the regulatory and technical issues associated with the revisions to the US EPA Guideline on Air Quality Models. The proposed guideline includes the models AERMOD, CALPUFF, and ISC-PRIME, all of which contain significant technical improvements over prior models. Differences in modelling requirements are appearing as regulatory agencies and industries use technically superior ...
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Screening method for regulatory purposes in the Argentine Republic
This paper presents a comparison between the screening method in accordance with the requirements of the Argentine regulations and the detailed screening procedures recommended by the United States Environmental Protection Agency (US-EPA). Both methodologies are applied to different scenarios of point sources in rural and urban areas. The intercomparison between both screening estimations is ...
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