我国典型城市PM_(2.5)空间分布均匀性分析

随着空气质量新标准的实施,从2013年开始我国部分城市先期开展了PM2.5的例行监测,从中选取不同区域的典型城市,分析了PM2.5在环境中的分布情况。分析结果表明:典型城市PM2.5日均值相对标准偏差(RSD)范围为13%~26%,平均值为18%;我国南方城市PM2.5空间分布均匀性优于北方城市,北方城市冬、春季节PM2.5分布的均匀性较差,南方城市夏季PM2.5分布的均匀性较差;PM2.5的空间分布均匀程度与PM10接近,但明显优于其他气态污染物。综合分析认为,目前我国国家监测网内PM2.5监测点位的代表性能够满足城市空气质量监测与评价工作需要。

STUDY ON THE SPATIAL DISTRIBUTION UNIFORMITY OF PM2.5 IN TYPICAL CITIES IN CHINA

With the implementation of the new air quality standards，measurements of PM2. 5 have been carried out in 74 cities since 2013． In this paper，the spatial distribution of atmospheric PM2. 5 in typical cities of different regions was analyzed． The relative standard deviation ( ＲSD) of PM2. 5 daily average concentration in these cities ranged from 13% to 26%，with average ＲSD of 18%; the spatial distribution of PM2. 5 in southern cities was more uniform than in northern cities; specifically，the spatial distribution of PM2. 5 in northern cities in winter and spring was less uniform than in summer and autumn，while in southern cities the spatial distribution was the least uniform in summer among all seasons; In terms of uniformity，the spatial distribution of PM2. 5 is similar to that of PM10 ，but better than gaseous pollutants． The comprehensive analysis shows that the representative of the PM2. 5 monitoring points in the current national monitoring network in China can meet the requirement of air quality monitoring and assessment in urban areas