导　　师： 王文兴

学科专业： H3001

授予学位： 硕士

作　　者： ;

机构地区： 山东大学

摘　　要： To assess the impact of pollution-control measures on air quality before and during Olympics, more than one month field study was carried out in Changping, a rural site in Beijing. The water-soluble fractions in PM2.5, trace gases /(SO2, NO2, O3, and CO/), and meteorological factors were on-line measured from 9 July to 25 August in 2008. The chemical compositions, temporal and diurnal variations, source apportionment of water-soluble ionic species in PM2.5 were studied during three different periods in detail. Furthermore, the impacts of meteorological conditions on PM2.5 and water-soluble ions on visibility in haze cases were also investigated. The results were summarized as follows: 1. Air quality before and during Olympics in Beijing was better than that of the corresponding period in 2007. Reduction of pollutants concentrations and improvement of air quality were contributed to pollution-control measurement and meteorological conditions before and during Olympics. The pollutants concentrations during Olympics were obviously lower than that before Olympics. Compared with alternative day-driving scheme period, the hourly concentrations of total water-soluble ions, SO2, O3 and CO during Olympics period, were reduced by 55/%, 42.9/%,30.8/% and 41.7/%, respectively. The hourly concentrations of SO2, O3 and CO were reduced by 38.5/%,24.3/% and 32.4/% compared with heavily-duty vehicles period, respectively. Except SO2 and NO2, the average hourly concentrations of O3 and CO often exceeded the National Standard of Air Quality. Their excess ratios during three different periods were 4.17/%,9.15/%,1.31/% and 10.98/%,29.06/%,4.96/%, respectively. 2. SO42-, NO3- and NH4+ were the dominant water-soluble fractions in PM2.5 in Changping site, accounting for 91.34/% of total water-soluble ions concentrations. The hourly concentrations of SO42-, NO3- and NH4+ during Olympics period were significantly lower than those during alternative day-driving scheme period, with 55.4/%,61.4/% and 56.0/% reduction, respectivel

关 键 词： 北京昌平 奥运会 水溶性离子 污染特征 来源解析 灰霾

领　　域： [环境科学与工程] [环境科学与工程]