| Summary: | 碩士 === 國立臺灣大學 === 環境工程學研究所 === 94 === The major pollutants caused PSI greater than 100 were PM10 and ozone in Taiwan. The relationship between concentration of ozone and ozone precursor was not linear, and reducing the precursor couldn’t be helpful for the reduction of ozone. How to control the amount of ozone was important for the air quality in Taiwan.
This research used the database from 2000 to 2004 of air quality monitoring station to analyze the value of ozone, potential ozone(O3 and NO2) and ozone precursor(NMHC and NOx). By concentration-time series method and geographic space distribution to understand why the concentration of ozone and potential ozone were high in some region and time period. Furthermore, this research established a qualitative assessment index to estimate the trend of emission of pollutants with the characteristic value relation between ventilate index and concentration of pollutants.
The result showed that ozone pollution in Taiwan was more and more serious, and the regions in which ozone pollution happened were enlarged. The most obviously serious region was central Taiwan, while the concentration of potential ozone was much higher in southern Taiwan.
The situation of high potential ozone concentration always happened in industrial regions, cities, and vital communication lines. But the regions in which high ozone concentration happened were always near cities or the remote monitoring stations. So far as seasons were concerned, the most serious ozone pollution happened in spring and summer for northern Taiwan, in fall and spring for central Taiwan, and in fall for southern Taiwan. However, in order of time period at which the serious ozone pollution happened was 12:00 and 1:00 p.m. for northern Taiwan, 1:00 and 2:00 p.m. for southern Taiwan, and 2:00 and 3:00 p.m. for central Taiwan. When ventilate index increased, it meant that the atmospheric diffusion was better so that air pollutants wouldn’t accumulate. And the ventilate index of central Taiwan increased much greater.
From this research, the concentration of ozone precursor- NOx decreased year by year, but NMHC increased. And the result of qualitative assessment index showed that the emission of NHMC, NOx, CO, and PM10 increased yearly and which was identical with the estimation of TEDS. Therefore, control the amount of ozone precursor would be implemental for the control of ozone.
|
|---|
