ozone concentration Articles
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Surface ozone measurements and meteorological influences in the urban atmosphere of Istanbul
Hourly measurements of ozone concentration in the urban atmosphere of Istanbul were carried out from February 1998 to July 1999. An assessment of the annual variations and relationships of ozone concentrations and meteorological variables was made. Annual variations were first examined without considering meteorological variables, and meteorological influences on ozone seasonal values were then ...
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An ozone climatology: relationship between meteorology and ozone in the Southeast USA
A statistical analysis of ozone (O3) concentrations and meteorological parameters was performed to determine the relationship between meteorological changes and ambient O3 concentrations in the Southeast United States. The correlation between average daily maximum O3 concentration and various meteorological variables was analysed on a monthly basis from April through October during 1980-1994. The ...
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Objective evaluation of statistical models for next day ozone forecasting
Different stochastic auto-regressive non-stationary models with exogenous inputs have been identified and validated in order to predict maximum ozone concentration expected for the next day. Selected inputs were one-day forecasted meteorological variables and average concentrations of ozone precursors (compounds involved in ozone formation chemical reactions, i.e. NO, NO2, NMVOC). The model ...
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Modeling Tip: Using Ozone File Editor Tools in BREEZE AERMOD
To model 1-hour and annual concentrations of NO2 for the National Ambient Air Quality Standard (NAAQS), the U.S. EPA has approved a three-tiered approach as detailed in Section 5.2.4 of EPA’s Guideline on Air Quality Models, Appendix W to 40 CFR Part 511 (Appendix W). This approach, as shown below, is recommended to estimate the ambient concentrations of NO2: Tier 1: Assume complete ...
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Application of adjoint CMAQ chemical transport model in the Athens greater area: sensitivities study on ozone concentrations
The factors affecting ground level ozone concentrations in the Greater Athens Area (GAA) are examined through adjoint sensitivity analysis, using a meteorology and air quality forecasting system based on MM5, the in–house EMISLAB emissions processing system and the chemical transport model Community Multiscale Air Quality (CMAQ). Sensitivities of the ground level ozone concentrations ('response ...
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Numerical experiments to determine MM5/WRF–CMAQ sensitivity to various PBL and land–surface schemes in north–eastern Spain: application to a case study in summer 2009
The Community Multiscale Air Quality (CMAQ) model was used along with the Weather Research and Forecasting (WRF) model to study air quality modelling sensitivity to various Planetary Boundary Layer (PBL) schemes and Land Surface Models (LSMs). The performance is assessed and quantified by comparing results with surface observations and the outputs provided by the fifth generation Mesoscale Model ...
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Application and intercomparison of the RADM2 and RACM chemistry mechanism including a new isoprene degradation scheme within the regional meteorology-chemistry-model MCCM
The huge number of species and reactions involved in the degradation of organic compounds does not permit explicit treatment in regional models, the use of condensed mechanisms is necessary. With increased knowledge about biogenic VOC chemistry, updates of the organic chemistry have become necessary. Geiger et al. (2003) introduced a RACM mechanism with improved isoprene and biogenic VOC ...
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Numerical simulations of the wind flow and ozone formation during the Heilbronn ozone experiment
The Heilbronn ozone experiment was aimed at investigating the impact of short-term local-scale interventions on peak ozone levels during summer smog periods. The measures taken were estimated to lead to considerable reductions of road traffic emissions, but to only smaller reductions of industrial emissions. Model simulations with the European Zooming Model (EZM) were performed for assessing the ...
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Application to Northern Italy of a new modelling system for air quality planning: a comparison between different chemical mechanisms
A modelling system has been developed for the analysis of photochemical pollution. It is composed of three modules: CALMET meteorological model, POEM-PM emission model and TCAM model. The system can accommodate chemical schemes based on both lumped molecule and lumped structure approaches. Application to an intense ozone production episode occurred in northern Italy has been performed. The ...
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Photochemical modelling of summer ozone episodes in the Greater Madrid area
The mesoscale meteorological model TVM, coupled to a photochemical/transport module in which different chemical mechanisms (RACM, EMEP) are implemented, has been evaluated. Field measurements and numerical results are used to determine the impact of the mesoscale flows on the photochemical smog episodes observed in the Greater Madrid Area for two selected days, characterised by the presence of a ...
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Sensitivity analysis of ozone long term simulations to grid resolution
In the frame of the CityDelta European modelling intercomparison, three different atmospheric chemistry transport models have been applied over the Milan area for a six-month summer simulation. To better evaluate the models' reliability and cleverness in simulating the long-term dynamics of pollutants in the atmosphere, a comprehensive sensitivity analysis with regard to all model configuration ...
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Sensitivity of CTM simulations to meteorological input
The objective of this work is to investigate the sensitivity of an Eulerian Chemical Tranport Model to the reconstruction of the wind field. In the framework of City-Delta exercise, three 14-day simulations have been performed, using the same model (CAMx) and different meteorological inputs; these were built combining large-scale analysis, local observations and the output of a high resolution ...
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MM5-SMOKE-CMAQ as a modeling tool for 8-h ozone regulatory enforcement: application to the state of Arizona
The Penn State/NCAR Mesoscale Meteorological Model 5 (MM5), Sparse Matrix Operator Kernal Emissions (SMOKE), and Community Multiscale Air Quality (CMAQ) modeling systems were employed to simulate ozone concentration distribution within the State of Arizona, in particular, Phoenix air basin, as supporting information to designate nonattainment areas of the U.S. Environmental Protection Agency's ...
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Estimate of potentially high ozone concentration areas in the centre of the Iberian Peninsula
This paper presents a study to determine the areas that could most probably be affected by high ozone levels in the centre of the Iberian Peninsula. Considering the years 1992 and 1995, cluster analysis was applied to some variables to group those days with similar meteorological states. Three different meteorological cluster groups were identified and their main features analysed. Additionally, ...
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Evaluation of the WRF meteorological model results during a high ozone episode in SW Poland – the role of model initial conditions
In meteorological, as well as air quality, modelling, input data plays an important role in the accuracy of the results, next to the model configuration. There are many sources of meteorological data available, both global and regional, and they differ not only by spatial and temporal resolution, but also by the number of observations included in the reanalysis and method of data assimilation ...
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Neural network-based study for predicting ground-level ozone concentration in large urban areas, applied to the Sao Paulo metropolitan area
Events of high concentration of ground-level ozone constitute a matter of major concern in large urban areas in terms of air quality, and public health. In the Sao Paulo Metropolitan Area (SPMA), air quality data generated by a network of air quality measuring stations have been used in a number of studies correlating ozone formation with different variables. A study was carried out on the ...
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Performance assessment of a long-term photochemical modelling system
Modelling systems can represent suitable tools to study photochemical pollution and to analyse and assess appropriate emissions reduction strategies. Since high tropospheric ozone concentrations are quite usual in Mediterranean areas, causing adverse effects on human health, materials and ecosystems, an integrated photochemical pollution modelling system has been developed and applied to Italian ...
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Effect of the soil wetness state on the stomatal ozone fluxes over Hungary
A coupled Eulerian photochemical reaction-transport model and a detailed ozone dry deposition model have been utilised for the estimation of stomatal ozone fluxes over Hungary. Ozone concentrations were modelled on an unstructured triangular grid using a method of lines approach to the solution of the reaction-diffusion-advection equations describing ozone formation, transport and deposition. The ...
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Implication of Applying CALPUFF to Demonstrate Compliance with the Regional Haze Rule
Abstract The U.S. Environmental Protection Agency promulgated the final Regional Haze Rule in July 1999 to protect Class I areas from visibility impairment. Industrial sources may be required to conduct modeling analysis to demonstrate their potential impact on nearby Class I areas during air permit applications. Although the widely used Industrial Source Complex Short-Term model (ISCST3) can be ...
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A mesoscale study of the impact of industrial emissions by using the MM5-CMAQ modelling system
The scientific interest in improving the air quality tools that provide a detailed description – source oriented – of atmospheric processes and the impact of specific large industrial emission points is growing. This paper describes the results of using a state-of-the-art third-generation air quality modelling system (MM5-CMAQ) over a pilot test industrial site in the Madrid mesoscale domain. The ...
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