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中文摘要：
2004—07—13～2004—08—23使用TDMPS-APS系统在线测量颗粒物的数浓度谱分布，并于07—16～07—18选取了高温闷热夜晚、日间高温高湿和雨后晴朗干洁3种天气条件，使用多级串联撞击式采样器（MOUDI）测量颗粒物的质量浓度谱分布，结果表明，高温高湿天气条件下颗粒物的污染、尤其细粒子污染严重，导致很低的能见度（2．5km）；PM1．8和PM10的质量浓度分别为170．68μg／m^3和249．35μg／m^3，细粒子质量浓度占PM10的68％；粒径为50～100nm颗粒物的数浓度最高，为2×10^4～3×10^4个／cm^3；降雨过程对粗粒子和细粒子均有去除作用，对细粒子的去除作用尤为明显；降雨后PM10和PM1．8浓度分别比降雨前降低3倍和6倍；降雨过后的晴朗干洁天气有利于新粒子（3～20nm）的生成，生成的新粒子快速长大到50～100nm；随着污染物的累积，以后几天内又变为污染天气．
英文摘要：
On-line measurements of particle number size distribution were conducted during 2004-07-13- 2004-08-23 by using TDMPS-APS system in Beijing; in between the size distributions of particle mass and chemical compositions were measured by using MOUDI cascade impactor under three kinds of weather conditions：① high temperature and high relative humidity night, ② high temperature and high relative humidity day, and ③ clear days. The results indicate that particulate matter, especially fine particle pollution becomes severe under high temperature and high relative humidity conditions, which results in low visibility （2.5km）; the average concentrations of PMI.8 and PM10 are 170.68 μg/m^3 and 249.35 μg/m^3, respectively, PMI.8 accounts for 68% of PM10; number concentration mainly concentrates in the range of 50--100nm, about 2 ×10^4 --3 ×10^4cm^-3; rain process has a great effect on scavenging particles, especially fine particles. After the rain process PM10 is 3 times lower and PM1.8 is 6 times lower than the values before the rain; in the following clear day, new particle formation is observed, the newly formed particles （3- 20nm） grow to 50-- 100nm rapidly. After that, the pollutants start to accumulate and it becomes heavy polluted in few days.
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