西安市一次重度污染天气特征及污染过程分析  

Analysis on the Characteristics and Pollution Process of a Severe Pollution in Xi'an

作　　者：刘慧娟 董思源 韩勇 秦杰英 Liu Huijuan;Dong Siyuan;Han Yong;Qin Jieying(Zhongyao Environment(Xi′an)Co.,Ltd.,Xi′an 710005,Shaanxi,China)

机构地区：[1]中遥环境(西安)股份有限公司,陕西西安710005

出　　处：《绿色科技》2024年第8期147-152,共6页Journal of Green Science and Technology

基　　金：西安市社会发展科技创新示范项目(编号:No.22SFSF0003)。

摘　　要：为研究西安市重度污染天气下气象因子的作用和污染物的传输特征,以2022年11-12月西安市一次典型细颗粒物(PM_(2.5))重度污染过程为例,基于西安市及其周边监测站点的空气质量数据,结合相对湿度、温度、风速及风向等气象观测数据,利用相关性分析和聚类分析等手段进行了污染天气过程特征的综合成因分析。结果表明:此次污染过程主要是由PM_(2.5)所致,同时与CO及NO_(2)呈较强的相关性;静稳天气下的高湿度和低风速条件是造成此次重度污染的主要原因;除本地污染源排放外,运城市和渭南市对于西安市PM_(2.5)传输贡献最为显著。In order to understand the role of meteorological factors and pollution transmission in severely polluted weather in Xi'an,based on air quality data from monitoring stations in Xi'an and its surrounding areas,combined with meteorological observation data such as relative humidity,temperature,wind speed,and wind direction,a comprehensive analysis of the causes of pollution weather process characteristics was conducted using correlation analysis and cluster analysis from November to December 2022.The results showed that the pollution process was mainly caused by PM_(2.5),with its concentrations far exceeding the national second level standard value,and there was a high correlation between PM_(2.5) and CO,as well as NO_(2);high relative humidity and low wind speed were the main meteorological factors of this sever PM_(2.5) pollution;in addition to local pollution source emissions,Yuncheng and Weinan had the most significant contributions to the local transport of fine particle in Xi'an.

关 键 词：污染天气 细颗粒物 气象条件 聚类分析 

分 类 号：X51[环境科学与工程—环境工程]