Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"ground-level ozone"”.
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Combining measurements with deterministic model outputs: predicting ground-level ozone
… We also apply the melding model to the ozone data to show the importance of using the Bayesian melding model to calibrate the model outputs. That is, to adjust the model outputs for the prediction of measurements. Due to the Bayesian framework of the melding model, we can extend it to …
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Bayesian spatio-temporal modelling for forecasting ground level ozone concentration levels
… and regulatory agencies of the air pollution levels that could cause adverse health effects. The most direct way to obtain accurate air quality information is from measurements made at surface monitoring stations across a study region of interest. Typically, however, air monitoring sites are …
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A Geospatial and Machine Learning Framework for Forecasting Ground Level Ozone Pollution
<p>The major detrimental health effects of ground-level ozone (GLO) pollution make it imperative that both policy makers and ordinary citizens have access to high accuracy, high-resolution forecasts of their local area. Recently, advancements in computing power have made it possible to apply …
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Ground-Level Ozone Across Kentucky: Modeling and a Synoptic Analysis of High Concentrations
… often more susceptible to high concentrations of ground-level ozone (O3) than urban areas. However, rural populations are, for the most part, unaware of this problem. Currently the rural areas of Kentucky have no daily forecast for O3. This research addresses the issue by using methodologies from …
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A Summer Simulation of Source Contributions to Ground Level Ozone Over the Continental United States
… study helps us to more completely understand ozone problems over different regions of the continental US. The results can lead to improvements in modeling surface ozone concentrations and in designing better ozone control strategies.
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Understanding extreme behavior by optimizing tail dependence with application to ground level ozone via data mining and spatial modeling
… strategy that is suitable for an analysis of ground level ozone, and spatially model the primary drivers of extreme ozone over a large study region. In this dissertation, we first review statistical methods for univariate and multivariate extremes. We then discuss tail dependence parameters …
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Reducing the contribution of the power sector to ground-level ozone pollution : an assessment of time-differentiated pricing of nitrogen oxide emissions
… and a requisite precursor for tropospheric (ground-level) ozone formation. Both pollutants significantly impact human health and welfare, so National Ambient Air Quality Standards (NAAQS) have been established for each. As of 2013, over 100 million people in the U.S. lived in areas with ozone …
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An evaluation of Tennessee's early action compacts to achieve compliance with new ozone standards: a dynamic analysis of reduction strategies to decrease tropospheric ozone formation
… Ambient Air Quality Standards (NAAQS) set for ground-level ozone. Under the Compact, local areas will have the flexibility to design and implement ozone reduction control measures specific to the area's needs. The EAC will also defer nonattainment designation from April 15, 2004 to a date no …
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Summertime ozone pollution in China: Observations and Simulations
Ground-level ozone is a secondary atmospheric pollutant that damages human and vegetation health. The chemical production of ground-level ozone involves the photochemical reactions between nitrogen oxides (NOX = NO + NO2) and volatile organic compounds (VOCs). China is experiencing high levels of …
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An investigation of ozone and sulfur dioxide concentrations in the Great Smoky Mountains National Park
Airborne measurements of ozone and sulfur dioxide concentrations were made in remote areas of the Great Smoky Mountains National Park using an instrumented aircraft. The study was conducted because the Park was designated an area to receive maximum protection from air pollutants and it was deemed …
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Modeling Interactions of Aircraft Emissions With Global and Regional Atmospheric Chemistry and Climate
… Airports do not contribute significantly to ground level ozone pollution in the Chicago area, and are much smaller than the effects due to other emissions such as those from vehicular traffic.
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Dynamic Bayesian models for modelling environmental space-time fields
… (BSP) approach to model spatio-temporal ground-level ozone fields and compare the accuracy of that approach with that of the DLM. Thirdly, we develop a Bayesian version empirical orthogonal function (EOF) method to incorporate the uncertainties due to temporally varying spatial process, …
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The effect and management of air quality in Prince George
… 10μm (PM10), particulate matter 2.5μm (PM2.5), ground level ozone (O3) and nitrogen oxides (NOx) has documented impacts on public health, which led governments to establish standards and regulate the emission of these airborne contaminants. In Northern British Columbia where many communities …
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Learning material for constructing environmental understanding
… projects. One of them was about measuring noise levels around the school, and it brought out the causes and effects of noise pollution in the context of the school. The other project was about measuring groundlevel ozone and comparing indoors and outdoors concentrations, this project exposed some …
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Structural Design and Analysis for a DeNOₓ Catalyst in Aviation
… and acid rain, and cause the formation of ground-level ozone that is detrimental to life. NOₓ formation in aircraft engines occurs because of high-temperature reactions between the nitrogen and oxygen naturally present in the air and is a spontaneous and unintended pollutant. One technology …
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Laboratory and Mechanistic Studies of Volatile Organic Carbon Oxidation Systems in the Atmosphere
… influence the formation of pollutants including ground-level ozone, CO2, and particulate matter (PM). Ozone and PM negatively impact human health, and all three pollutants influence Earth’s climate. VOCs also dominate the OH reactivity of the atmosphere which in turn influences concentrations of …
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Investigating hydrogen peroxide dynamics and the role of plasma membrane aquaporin PIP1:4 in plant sensitivity to ozone.
Tropospheric ozone is both a greenhouse gas and a damaging oxidative agent. Increasing anthropogenic emissions of precursor pollutants since the Industrial Revolution has led to significant increases in ground-level ozone concentrations. Phytotoxic concentrations of ozone occur throughout many …
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Understanding ozone, climate and their interactions with causal machine learning
… explores two closely related risks, surface ozone and temperature. Simulating both currently requires the use of complex numerical models, which are limited by incomplete process knowledge, inadequate resolution and subsequent necessary parametrisations. This thesis develops and applies …
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A Comparison of Solvent and Water-Borne Alkyd Coatings and the History of VOC Regulations in the United States
… such as smog and compounds contributing to ozone depletion, through Clean Air Acts. The first Clean Air Act was enacted in 1965, but it wasn’t until the Clean Air Act of 1990 that VOC emissions became a focus. VOCs are not inherently hazardous but are a source of concern because they serve …
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Cluster-enhanced Ensemble Learning for Mapping Surface Ozone in China
As global air quality deteriorates, ground-level ozone (O3) has gained significant attention as a major secondary pollutant. Its simulation and prediction have become key research areas. Existing studies on ozone concentration simulation and prediction primarily focus on individual urban scales, …
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