Analysis of Ozone Concentration with Focused on Traffic Flows and Ultraviolet Radiations in Seoul, Korea
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초록
Higher traffic flows generally lead to increased direct pollutant emissions, resulting in higher pollution concentrations. In the case of ozone (O3), a secondary pollutant, however, decreased traffic flows during weekends create favorable conditions for generating O3. Similarly, urban background regions have better atmospheric circumstances for O3 creation than roadside areas. These two favorable temporal and spatial conditions result in higher O3 concentrations in urban regions. To explain these counterintuitive phenomena, I reviewed the chemistry of O3 and discussed the changes in traffic flows and solar radiation in Seoul, Korea. Solar radiation plays a vital role in determining O3 concentrations. The more ultraviolet (UV) radiation, the more O3 will be generated because solar radiation initiates the photo-dissociation of nitrogen dioxide (NO2). Dynamic O3 concentration is determined according to the O3 generation rate and the O3 destruction rate. UV rays play a crucial role in the production of O3, and the production ratio varies depending on the intensity of UV. Therefore, to explain hourly O3 concentrations, it is necessary to adopt a properly modified UV ray as an explanatory variable. The result shows that the 6-hour moving average of UV ray is identified to explain best for hourly O3 concentrations.
Abstract
Higher traffic flows generally lead to increased direct pollutant emissions, resulting in higher pollution concentrations. In the case of ozone (O3), a secondary pollutant, however, decreased traffic flows during weekends create favorable conditions for generating O3. Similarly, urban background regions have better atmospheric circumstances for O3 creation than roadside areas. These two favorable temporal and spatial conditions result in higher O3 concentrations in urban regions. To explain these counterintuitive phenomena, I reviewed the chemistry of O3 and discussed the changes in traffic flows and solar radiation in Seoul, Korea. Solar radiation plays a vital role in determining O3 concentrations. The more ultraviolet (UV) radiation, the more O3 will be generated because solar radiation initiates the photo-dissociation of nitrogen dioxide (NO2). Dynamic O3 concentration is determined according to the O3 generation rate and the O3 destruction rate. UV rays play a crucial role in the production of O3, and the production ratio varies depending on the intensity of UV. Therefore, to explain hourly O3 concentrations, it is necessary to adopt a properly modified UV ray as an explanatory variable. The result shows that the 6-hour moving average of UV ray is identified to explain best for hourly O3 concentrations.
참고문헌 (29)
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