air dispersion monitoring Articles
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IFDM modelling for optimal siting of air quality monitoring stations around five oil refineries
An IFDM modelling study has been conducted to determine the optimal siting of air quality monitoring stations around five oil refineries. The purpose of this immission monitoring network is specified in environmental legislation. The most appropriate output parameter of the IFDM model for this study is the 98th percentile of the moving 24 h averages, P98,m24h. Modelling for the optimal siting of ...
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National Ambient Air Quality Standards Update
You have seen ALL4 documenting the corresponding evolution of the NAAQS levels since the current U.S. EPA administration started in January 2009, and we will continue to follow them closely and provide you with updates that we think are important to your operations. The following sections provide updates on the most important NAAQS and how you can plan for them today. Discusses SO2, air ...
By All4 Inc.
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Near-field geometry effects on urban street canyon measurements for model validation
Selection of numerical urban pollution dispersion models for regulatory purposes entails reliable prior validation against either physical modelling or field measurements. It is shown that an asymmetric geometry of the urban street canyon, in which measurement takes place, induces persistent gradients in pollution dispersion within it, irrespective of the wind vector meandering above the roofs. ...
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Estimation of the contribution to air-quality degradation in Athens from major elevated sources
The dispersion of air pollutants released from the major elevated sources in the Attica Peninsula has been studied extensively. An attempt was made to estimate average concentrations for some non-reactive air pollutants. These estimates were made with a two-way interactive nesting, prognostic model, RAMS, a Lagrangian particle dispersion model, LPDM, and a synoptic classification scheme developed ...
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Practical use of the ISCST3 model to select monitoring site locations for air pollution control
We present an objective methodology for selection of the minimum number of sampling sites required to register the highest concentration values of air pollutants emitted from a continuous point source. The methodology is based on the analysis of 1-hour concentration values above a threshold value estimated by atmospheric dispersion models. The number and location of the air monitoring stations ...
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