西安地区供暖初期颗粒物及气态污染物的污染状况及其相关性分析

对2015年供暖初期西安地区细颗粒物(PM_(2.5))、可吸入颗粒物(PM_(10))、二氧化硫和二氧化氮的污染进行研究。结果发现:西安供暖初期可吸入颗粒物污染已经相当严重,其中处于二级污染水平的占22%,处于三级污染水平的占39%,并有2天属大于300μg/m~3的最高6级严重污染状况。利用统计学软件SPSS对各区污染进行聚类分析,得出西安污染最严重的3个区分别为灞桥区、雁塔区和莲湖区。对4种污染物以及温度、相对湿度之间进行相关性分析发现,二氧化氮与二氧化硫、细颗粒物、可吸入颗粒物和相对湿度之间都存在很强的相关性。另外从细颗粒物和可吸入颗粒物的区域分析可知,雁塔区和莲湖区污染严重。

CONTAMINATION STATUS AND CORRELATION ANALYSIS OF PARTICULATE MATTER AND GASEOUS POLLUTANTS IN THE EARLY HEATING PERIOD IN XI'AN

At the beginning of the heating period in Xi ’an in 2015,pollution condition of fine particulate matter (PM2.5),particulate matter (PM10),sulfur dioxide and nitrogen dioxide pollution were studied.The results showed that early in the heating period in Xi'an,PM1o pollution was very serious,accounting for 22％ of second pollution level,and 39％ of third pollution level,and there was also two days when PM1o concentration was greater than 300 μg/m3 (the highest sixth level).Clustering analysis on all regions in Xi'an using SPSS showed that,Baqiao district,Yanta district and Lianhu district in Xi'an were with the most serious pollution level.Correlation analysis on the pollutants and temperature,relative humidity,showed that strong correlation existed in nitrogen dioxide and sulfur dioxide,fine particulate matter,particulate matter and relative humidity.In addition,analysis on fine particulate matter and particulate matter showed that Yanta District and Lianhu Districtwere with the highest pollution extent.