吉安市城市空气PM_(10)与PM_(2.5)污染状况及时空分布特征

Pollution Status of PM_(10) and PM_(2. 5) Its Characteristics of Temporal and Spatial Distribution in Ji'an City

为研究吉安市城市PM_(10)及PM_(2.5)污染状况及时空分布特征,对吉安市2015年1月至2017年8月4个城市环境国家环境空气监测点的PM_(10)及PM_(2.5)监测数据进行统计分析。结果表明:吉安市城市空气质量表现出冬季PM_(10)浓度明显高于春、夏、秋季,PM_(2.5)/PM_(10)比值为0.632~0.851,PM_(10)及PM_(2.5)均呈现出W型变化规律,6:00达到最低值,11:00-12:00达到最高值;12:00-17:00浓度下降,17:00-23:00浓度再次回升,至23:00再次达到最高值。

In order to study the pollution status and spatial and temporal distribution characteristics of PM10and PM2.5in Ji’an,the monitoring data of PM10and PM2.5from 4 urban environmental air monitoring sites in January 2015 to August 2017 in Ji’an city were analyzed statistically.The results show that the air quality in Ji’an city showed the concentration of PM10in winter was significantly higher than that in spring,summer and autumn,the ratio of PM2.5/PM10to 0.6320.851,PM10and PM2.5showed the variation law of W type,6：00 to reach a minimum value of 11：00-12：00 reached the highest;12：00-17：00 concentration decreased,the concentration of 17：00-23：00 to rise again and again reached the highest value at 23：00.