辽宁中部城市群可吸入颗粒物PM_(10)和PM_(2.5)的污染特征研究

Pollution characteristics of inhalable particles PM_(10) and PM_(2.5) in the city group of middle Liaoning province

利用2006年8月—2007年10月辽宁中部沈阳、鞍山、抚顺和本溪4城市可吸入颗粒物PM10、PM2.5和PM1及同期气象因子监测资料,分析了可吸入颗粒物分布特征、污染水平及其与气象因子的关系。结果表明:受区域天气系统的影响,4城市PM10和PM2.5的日平均浓度变化趋势基本一致,具有区域分布特征;PM10超标率冬季为最高;PM2.5日平均浓度占PM10比例夏季和冬季最大;PM10、PM2.5与PM1之间有较好的相关性;PM10与风速、温度呈负相关,PM2.5和PM1与能见度、风速、温度呈负相关,与相对湿度成正相关。

Based on the inhalable particles data of PM10, PM25 and PM1 from August 2006 to October 2007 in Shenyang,Anshan, Fushun and Benxi and the relevant meteorological data, the distributions and pollution characteristics of those inhatable particles as well as the relationships with meteorological factors were analyzed in this paper. The results show that the change trends of the daily mean concentrations of PM10 and PM2 5 in the four cities are similar because they are affected by the regional synoptic system. And these changes are of the regional distribution characteristics. The exceeding standard ratio of PM10 is the highest in winter. The ratio of the daily mean concentration of P.M2.5 and PM10 is the largest in both summer and winter. The correlations are better among PM10, PM2 5 and PMI. The relationship between PMHI and wind speed as well as air temperature is negative. PM2.5 and PM1 have negative relationships with visibility, wind speed and air temperature, while they are positive relationships with relative humidity.