| Summary: | 碩士 === 國立臺灣大學 === 環境衛生研究所 === 90 === Nitrogen dioxide, widely existing in our environment, is one of the five major pollutants of Pollutant Standards Index in Taiwan. Epidemiological studies proved it has effects on human, especially respiratory tract.
The study was to determine the personal exposure to nitrogen dioxide in Taipei City and the relation between ambient air pollution and major source controls proposed by government. Personal monitoring was carried out during April to March in 2001. The subjects recruited from nine subgroups were 302 persons in total. Each personal sampling for nitrogen dioxide had been taken for 48 ± 1 hours by using passive sampler. The Griess-Saltzman colorimetry was employed for analysis. An organized questionnaire was utilized to gather information about demographic data and complaints in response to air pollution. The related public statistics was also referred. Finally, statistic method was performed.
The 276 persons out of the subjects responded to the investigation. Excluding those with incomplete information and/or outlier, 248 persons including 43 male smokers were finally enrolled for further data process. The average exposure level with geometric mean of nitrogen dioxide of 52.83 ppb and geometric standard deviation of 1.74 statistically differed from the exposure geometric mean of 62 ppb in 1990. According to the respond from the questionnaire, citizens with exposure level between 65～75 ppb had higher percentage of complaint about illness than those in other exposure levels. The personal exposure level did not significantly correlate with meteorologic factors during sampling. The data obtained from the air quality monitor stations could not properly reflect personal exposure. The regulatory controlling measures for pollution of vehicles likely lowered the yearly growth rate of car and motorcycle. And the total carrying capacity of the Taipei rapid transit system affected annually ambient nitrogen dioxide level.
It was concluded that personal exposure to nitrogen dioxide in Taipei City tended to decrease in the past ten years.
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