道路景观绿化林带对空气颗粒物浓度的影响

Effect on the air particle concentration of road landscape green belt

【目的】掌握道路景观绿化林带对空气颗粒污染物的影响,在成都驿都大道道路景观绿化林带,开展了TSP(空气总悬浮颗粒物)、PM10(粒径在10μm以下的颗粒物)、PM2.5(粒径在2.5μm以下的颗粒物)和PM1(粒径在1μm以下的颗粒物)4种空气颗粒物浓度观测.【方法】根据实时监测数据,采用浓度和净化百分率评价法分析了道路绿化林带对空气颗粒物的影响.【结果】林带带宽10m处,仅PM10和TSP 2种空气颗粒物的日均浓度达到国家二类区域环境空气质量要求的,分别为(132.0±1.2)μg/m3和(289.2±0.7)μg/m3;30 m林带带宽处的PM2.5,PM10和TSP 3种空气颗粒物的日均浓度分别为(72.3±0.5)μg/m3,(120.9±0.4)μg/m3和(268.9±0.4)μg/m3,均达到了国家二类区域的环境空气质量要求标准;道路景观绿化林带对PM1和PM2.5的净化率峰谷时间出现在15∶00~17∶00,PM10出现在13∶00~15∶00,TSP出现在11∶00~13∶00.【结论】道路景观绿化林带对空气颗粒物有消减作用;净化率随着绿化林带带宽的增加而加大;林带相同带宽处,林带对空气颗粒物的净化率随颗粒物粒径的增大而增加.

【Objective】In order to ascertain the effect on air particle pollutants by road landscape green belt,this paper launched a observations on four kinds of concentration of air particle which they were TSP（total suspended particles）,PM10（particle diameter of 10 microns or less）,PM2.5（particle diameter of2.5 microns or less）and PM1（particle size less than 1 micron particles）.【Method】According to real-time monitoring data,it analyzed the impact of road landscape green belt of air particle matter by using the concentration and percentage assessment of purification percentage.【Result】The concentration of air particle（PM10 and TSP）met the national Class II Zone quality standard when the landscape green belt reached10 m width,it was（132.0±1.2）μg/m3 and（289.2±0.7）μg/m3;The concentration of air particle（PM2.5 PM10 and TSP）met the national Class II Zone quality standard when the landscape green belt reached 30 m width,it was（72.3±0.5）μg/m3,（120.9±0.4）μg/m3,（268.9±0.4）μg/m3;However,the peak of purification rate of PM1 and PM2.5 appeared from 15∶00 pm to 17∶00 pm,and PM10 came out during 13∶00 pm to 15∶00 pm and TSP appeared from 11∶00 am to13∶00 pm.【Conclusion】The road landscape green belt canabate air particle;the purification rate increased with the increased of width;In the same width,the purification rate increased with the increased of air particle size.