银川市大气污染物变化特征及影响因素分析

Variation characteristics and influencing factors of atmospheric pollutants in Yinchuan

以银川市城区2015年1月1日~2015年12月31日空气质量监测数据和气象资料为基础,结合污染源背景分析,探讨了大气污染物时空分布特征及其影响因素。结果表明:1)银川市首要污染物主要有PM_(10)、PM_(2.5)、SO_2和O_3,以颗粒物为主;2)银川市大气污染物浓度表现出明显季节特征,即SO_2、PM_(10)和PM_(2.5)浓度总体上呈冬春季高、夏秋季低的特点。O_3浓度总体上呈夏季高,其他季节低的特点。这与不同季节污染物排放源强度、地理背景和气象条件等有关。3)银川市大气污染物浓度区域表现特征整体呈中部低,东、西部高的特点,主要受区域污染物排放源强度影响。

Variation characteristics and influencing factors of atmospheric pollutants in Yinchuan were studied based on the environmental monitoring and meteorological data during January 1,2015 ~ December 31,2015 and the backgrounds of pollutant sources. The results showed that the principal pollutants in Yinchuan were PM_（10）,PM_（2.5）,SO_2 and O_3,mainly particulate matter-oriented. Atmospheric pollutants in Yinchuan showed obviously seasonal characteristics,that to say,the concentration of PM_（10）,SO_2 and PM_（2.5） was higher in winter and spring,and lower in autumn and summer; O_3 concentration varied seasonally from the peak in summer to the bottom in others. The seasonal characteristics were in relation with the source of pollutant in different seasons,the geographic background and meteorological conditions. The spatial variations of atmospheric pollutants were that the pollution in the western and eastern regions was more serious than that in the middle region,and it was mainly affected by the strength of regional pollutants source.