兰州市大气颗粒物污染特征分析

The Research of Air Pollution Particles Characteristic and Comparative Analysis in Lanzhou

对兰州市2011—2012年大气颗粒物污染状况进行了研究,在主导风向上设置采样点,分别连续监测PM10、TSP、风速、能见度。结果表明,兰州市颗粒物浓度的峰值出现在2—4月,TSP浓度最大值可达到2.465 mg/m3,PM10最大值可达到2.079 mg/m3;颗粒物污染的季节性强,以3、4月出现的频率最高,发生时间具有随机性;2012年兰州市全年颗粒物(PM10和TSP)平均小时浓度值低于2011年,沙尘天气发生频次较2011年有所降低,环境空气质量有所改善。

The pollution property of atmospheric particulates in Lanzhou city in 2011-2012 was studied, as well as continuous monitoring of PM10 , TSP, wind speed, visibility in the sampling points in the dominant wind direction. The results show that the peak particle concentrations in Lanzhou city in February to April, maximum concentration of TSP can reach 2. 465 mg/m3 , the maximum PM10 value can reach 2. 079 mg/m3; Particulate matter pollution is seasonal, the highest frequency of occurrence in March to April and occurrence time is random;In 2012 in Lanzhou city, the particulate matter （ PM10 and TSP） average hourly concentration lower than 2011, dust weather frequency lower than in 2011, ambient air quality improved.