南宁地铁车站关键区域PM25浓度实测研究
Field measurement of PM25 concentrations in key areas of Nanning Metro station
摘要：
对处于运营初期的南宁地铁某地下屏蔽门车站的站台、站厅及区间隧道的PM25浓度进行了为期6个月的连续监测。测试结果表明：站厅、站台和隧道的PM25浓度不满足GB 3095—2012《环境空气质量标准》中二级浓度日均值的天数占比分别为3%、10%和23%；站厅、站台和隧道的PM25浓度变化趋势与室外PM25浓度呈极强的正相关性；大系统新风比对站厅、站台及隧道的PM25浓度的影响并不显著；站厅、站台和隧道的PM[2]5浓度水平分别约为室外的0.9、11和15倍；隧道内的PM25浓度对室外PM25浓度的波动较为敏感，当室外浓度上升或降低时，隧道内的浓度则会迅速表现出更大幅度的上升或降低；客流量对站内PM25浓度有一定的影响。
Abstract：
In this paper, the concentration of PM25 in the station hall, platform and interval tunnel of an underground station of Nanning Metro with platform screen door in the early stage of operation is continuously monitored for 6 months. The test results show that the number of days when the concentration of PM25 in the station hall, platform and tunnel does not meet the daily average of class Ⅱ concentration in the GB 3095-2012Ambient air quality standards accounts for 3%, 10% and 23%, respectively. The variation trend of PM25 concentration in the station hall, platform and tunnel has a strong positive correlation with the outdoor PM25 concentration. The effect of the outdoor air ratio on the concentration of PM25 in the station hall, platform and tunnel is not significant. The concentration levels of PM25 in the station hall, platform and tunnel are about 0.9, 11 and 15 times that of outdoor, respectively. The PM25 concentration in the tunnel is sensitive to the fluctuation of outdoor PM25 concentration, and when the outdoor concentration increases or decreases, the PM25 concentration in the tunnel will quickly show a greater increase or decrease. The passenger flow has a certain impact on the PM25 concentration in the station.
Keywords:subway station; air quality; PM25 concentration; station hall; platform; tunnel