2019年陕西省地级市PM_(2.5)变化特征比较及驱动力分析

Comparison of PM_(2.5)Change Characteristics and Driving Force Analysis of Each Prefecture-Level City in Shaanxi in 2019

选取2019年陕西省各个地级市的PM_(2.5)质量浓度观测数据,运用统计学分析方法比较了陕西省各个地级市的PM_(2.5)时间变化特征及差异原因,另外分析了陕西省PM_(2.5)质量浓度的空间分布特征。结果表明:陕西省各地级市PM_(2.5)浓度值月变化趋势呈“U”字型,具有“冬季高夏季低”的特点,PM_(2.5)质量浓度空间分布上呈现出北部较低,南部偏高,中部最高的特点。其中,咸阳市、西安市的PM_(2.5)浓度全年居高,延安市、商洛市的PM_(2.5)浓度偏低。最后提出了PM_(2.5)浓度的控制措施。

This paper selected the observation data of PM_(2.5)mass concentration of each prefecture-level city in Shaanxi province in 2019,and used statistical analysis methods to analyze and compare the temporal variation characteristics and the reasons for differences of PM_(2.5)of each prefecture-level city in Shaanxi province.In addition,it analyzed the spatial distribution characteristics of PM_(2.5)mass concentration in Shaanxi province.Then the control measures of PM_(2.5)concentration are put forward.The results show that the monthly change trend of PM_(2.5)concentration in each prefecture-level city of Shaanxi province is in the shape of“U”,which has the characteristic of"high in winter and low in summer".The spatial distribution of PM_(2.5)mass concentration shows that the North is relatively low,the South is relatively high,and the middle is the highest.Among them,the concentration of PM_(2.5)in Xianyang city and Xi’an cities is high throughout the year,while that in Yan’an city and Shangluo city is low.