PM2.5在北京几种典型居住区中的分布及扩散比较

Distribution and Diffusion Comparison of PM2.5 in Several Typical Residential Areas in Beijing

为厘清多种总平面布局对PM2.5在居住区内部地面的扩散有何影响,该文对北京市同一区域6种典型布局的居住区进行了PM2.5质量浓度历时1年的"同时性"监测。结果表明:1不同布局的居住区,其地面PM2.5质量浓度分布及扩散有显著差别。2春、夏、秋季,多组团集中式布局的居住区,其PM2.5质量浓度较高,行列式、合院式较低。冬季则反之亦然。3风环境、地面气温对PM2.5的分布及扩散具有较大影响。同时,影响居住区PM2.5分布及扩散的主要原因包括风环境及地面气温等。

In order to clarify the influence of different master plane layout on the diffusion of PM2.5 in the residential areas, we process ＂Simultaneous＂ monitoring of PM2.5 concentration in the residential area of 6 typical layout of Beijing City, which lasted 1 year. The results show that： （1） different layout of residential areas, the distribution of PM2.5 concentration and diffusion has a significant difference on the ground. （2） in spring, summer and autumn, the residential area of the centralized layout of the multi group, the higher PM2.5 concentration, the lower of determinant and the courtyard, vice versa in winter. （3） the wind environment and the air temperature have a great influence on the distribution and diffusion of PM2.5. The main reasons that affect the distribution and diffusion of PM2.5 in the residential areas, including the wind environment and the ground temperature, are pointed out.