2013年北京市PM_(2.5)重污染日时空分布特征研究

Analysis on Spatial and Temporal Distribution of PM_(2.5) During heavy Pollution Days in Beijing in 2013

根据2013年北京市环境保护监测中心监测的PM2.5数据，系统分析了北京市重污染日PM2.5污染的时空分布特征，并利用克里格插值初步统计了全年和重污染日PM2.5不同浓度区间的国土面积。2013年全市PM2.5年均浓度为89．5μg／m2，重污染日平均浓度为218μg／m2，重污染日主要集中在冬季；PM2.5年均浓度呈现明显的南高北低梯度分布特征，而重污染日空间分布较均匀，南部及城六区存在明显的高污染区，平均浓度在180μg／m2以上；2013年北京市重污染日PM25平均浓度为150～250μg／m2，其对应的国土面积约为12656km2，PM2.5平均浓度在250μg／m3以上的国土面积约为883km2，而全年无PM2，平均浓度在150μg／m3上所对应的国土面积。

In this paper, we analyzed the spatial and temporal distribution of PM2.5 during the whole year and heavy pollution days and analyzed the land area of different concentrations using kriging interpolation based on the fine particulate matter monitoring data that Beijing Municipal Environmental Monitoring Center released in 2013. Analysis results showed that the city＇s annual average PM2.5 concentration was 89.5 μg/m3 in 2013 with 218 μg/m3 during heavy pollution days and heavy pollution days mainly concentrated in winter; the annual concentration of PM2.5 showed significant north-south gradient distribution while the distribution of PM2.5 during pollution days was relatively uniform ; there were obvious high pollution area in the South and city area and the average concentration of high pollution area was above 180 μg/m3 ; the land area with average PM2. 5 concentration of 150- 250 μg/m3 during heavy pollution days was about 12 656 km2 with the land area of PM2.5 concentration above 250 μg/m3 883 km2 while the land area of annual PM2.5 concentration above 150 μg/m3was zero.