Effects of Traffic and Meteorological Factors on Ozone Concentration

서지정보

· 발행기관 : 한국교통연구원
· 수록지 정보 : 교통연구 / 28권 / 3호 / 13 ~ 31페이지
· 저자명 : 김영국

초록

Vehicles are a vital source of directly emitted pollutants. Thus, transportation is responsible for a substantial share of pollutants’ concentrations in urban regions, and it is logical to infer that decreased vehicle flows lead to reduced direct emissions. In the case of ozone, chemical reactions are the primary determinant of O3 concentrations, and a decrease of directly emitted vehicle exhausts leads to favorable conditions for O3 generation. Therefore, decreased vehicle flows increase O3 concentrations, especially in urban regions. In addition to traffic flows, meteorological factors also influence O3 concentrations. Tropospheric O3 is produced by photochemical reactions involving UV rays and precursors. Episodes of high O3 concentrations occur in the late Spring and Summer under such meteorological conditions as high pressure, warm temperature, low cloud cover, and light wind. Among them, solar radiation plays an important role in determining O3 concentrations. UV is indispensable for generating O3, and it is necessary to focus on the relationship between the intensity of UV and O3 concentration.
The purpose of this study is to investigate the impacts of traffic volume and meteorological factors on O3 concentrations. Since traffic volume and UV change with time, this study attempts to model these two elements, which are essential for ozone generation, using time-series data. The results show that the coefficient of traffic is negative and that of solar radiation is positive, supporting the theory. However, since the squared variable of traffic also has a statistically significant positive effect, caution is required in interpretation.

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