| Summary: | 碩士 === 崑山科技大學 === 環境工程研究所 === 107 === The issue of air pollution is always much paid attention by the public. Recently most of the issue ws focused on PM2.5 and PM10, which were harmful to human body. However, the most basic air pollution gas, CO2, was not to be under-estimated by now. Therefore, in this study, it was worthwhile to analyze the trend of CO2 concentration in Taiwan over the years. This study used the data from the Taiwan Environmental Protection Agency and NASA satellites as a basis to analyze the trend of CO2 changes in Taiwan from 2007 to 2017.
The result showed that the overall CO2 concentration distribution in Taiwan was seasonally observed. The highest trend was in the fall（y=2.6x+391.9, R^2=0.93）, i.e., 2.6 ppm／year, the lowest was in summer （y=2.1x+395.5, R^2=0.76）, 2.1 ppm／year; highest in concentration in spring（414.9 ppm）and lowest in autumn（407.4 ppm）.
The geographic trends was the same but would be due to the location of the terrain, population density, etc. Different factors caused different concentrations. In this paper, two monitoring stations located in the northern region, the concentration of the Songshan monitoring station （416.2 ppm）in the urban area was significantly higher than the Yangming monitoring station（399.6 ppm）located in the mountainous saddle.
Taiwans overall CO2 concentration distribution was also performed. the highest trend was in Songshan（y=3.4x+395.8,R^2=0.94）, which was an increase of 3.4 ppm／year, and the lowest in Dali（y=1.3x+415.7, R^2=0.62）, 1.3ppm／year. The highest concentration was in Dali（424.0 ppm）and the lowest in Hengchun（395.8 ppm）. The highest growth rate was in Songshan（8%）, and the lowest in Shanhua （-1%）. In addition, the case of Dali was special with the trend as the lowest（y=1.3x+415.7, R^2=0.62）（i.e., an increase of 1.3 ppm／year）and a low growth rate（2%）but the highest level the concentration（424.0 ppm）.
Finally, compared with other local data, Taiwans CO2 concentration would be significantly higher than other regions and global CO2 concentrations. In addition, after comparing the data of the monitoring station with the satellite monitoring, it showed that the CO2 concentration was increasing, and the growth rate was also consistently 5%. Although the accuracy of satellite monitoring data was not so high, it could be worthy as a reference, and it was hoped that the accuracy of satellite monitoring will be improved in the future.
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