气像条件对南昌市PM_(2.5)浓度的影响分析

Impact Analysis of Meteorological Condition on PM_(2.5) Concentration in Urban Nanchang

利用江西省南昌市2015年6月1日—2016年5月31日逐日空气质量数据,结合同时期的气象观测资料,对南昌市大气污染特点及其与气象要素的相关性进行分析研究。结果表明,南昌市"轻度污染"、"中度污染"、"重度污染"天气天数占全年天数的15%,其中首要污染物主要为PM_(2.5),且主要集中在10月—次年3月期间。通过相关性分析,表明PM_(2.5)的浓度与日平均气温、日20—20时降水量、日平均相对湿度、日平均风速呈显著负相关关系。

Based on day - by - day air quality data as well as contemporaneous meteorological observation data of Nanchang City in Jiangxi from June 1, 2015 to May 31, 2016, analysis and research on the relevance between characteristics of atmospheric pollution and meteorological elements were carried out. The results showed that the number of days with “mild contamination” ,“medium contamination”, and “ serious contamination” accounted for 15% of the days all the year round. Among the contaminants, the most serious one was PM2.5, which attentively appeared from October 2015 to March 2016. Through correlation analysis, it was discovered that there was a re-markably negative correlation between the concentration of PM2.5 and daily average temperature, daily precipitation from 20：00 to 20：00, daily average relative humidity ＆ daily average wind speed.