城市主干道夏季大气颗粒物日变化规律研究——以南宁市为例

Study on Diurnal Variation of Atmospheric Particulate Matter in Summer on Urban Arterial Road

以南宁市种植有茂密林带的主干道路为研究对象,对空气中PM0.5、PM1.0、PM2.5、PM10、TSP等的质量浓度随时间变化的规律进行了研究,结果表明:PM0.5、PM1.0质量浓度的日变化趋势基本相同,主要受绿色植物生理活动的影响,最高值都出现在凌晨4∶00,最低值则都出现在下午18∶00;PM2.5质量浓度的高值出现在4∶00和8∶00;PM10、TSP质量浓度的日变化趋势基本相同,变化曲线呈现双波峰的变化趋势,自由沉降在PM10、TSP的除去中占主导地位,绿色植物生理活动的影响较弱,PM10质量浓度的高值出现在8∶00和22∶00,TSP质量浓度的高值出现在10∶00和22∶00。

In this paper,the main road planted with dense forest belt in Nanning City is taken as the research object,and the concentration of PM 0.5,PM 1.0,PM 2.5,PM 10 and TSP in the air is studied with time.The results show that the daily variation trend of PM 0.5 and PM 1.0 concentration is basically the same.The highest concentration of both occurs at 4∶[KG-*3/5]00 in the morning,and the lowest concentration occurs at 18∶[KG-*3/5]00 in the afternoon.The maximum concentration of PM 2.5 appeared at 4∶[KG-*3/5]00 and 8∶[KG-*3/5]00.The daily variation trend of PM 10 and TSP concentration is basically the same,and the change curve shows the change trend of single and double peaks.Free sedimentation dominates the removal of PM 10 and TSP,and the influence of green plant physiological activities is weak.The maximum values of PM 10 concentration appear at 8∶[KG-*3/5]00 and 22∶[KG-*3/5]00 respectively,and the maximum values of TSP concentration appear at 10∶[KG-*3/5]00 and 22∶[KG-*3/5]00 respectively.