2013年北京市细颗粒物时空分布特征研究

根据2013年北京市PM2.5监测数据,系统分析了北京市PM2.5污染的时空分布特征,并利用克里格插值统计了四季PM2.5不同浓度区间的国土面积。结果显示:2013年全市PM2.5年均浓度为89.5μg/m3,超过年均35μg/m3的国标1.56倍;PM2.5浓度由高到低的季节依次是冬季、春季、秋季和夏季;空间分布上PM2.5呈现明显的南北梯度分布特征;2013年PM2.5平均浓度达标对应的国土面积占比夏季最大为73%,冬季最小为22%。

ANALYSIS ON THE SPATIAL AND TEMPORAL DISTRIBUTION OF PM_(2.5) IN BEIJING IN 2013

This paper analyzed the spatial and temporal distribution of PM2. 5 and discussed the land area of different concentrations using Kriging interpolation based on the fine particulate matter monitoring data released by Beijing Municipal Environmental Monitoring Center in 2013． Analysis results showed that the city' s annual average PM2. 5 concentration was 89. 5 μg /m3 in 2013 exceeding the national standard( 35 μg /m3 ) 1. 56 times; Seasonal variations concentrations of PM2. 5 were as follows: winter ＞ spring ＞ autumn ＞ summer; PM2. 5 showed significant north-south gradient distribution; the proportion of land area in which average PM2. 5 concentration was below 75 μg /m3 was the largest in Summer with 73% while that was the least in Winter with 22%．