Institute of Environmental Assessment and Water Research (IDÆA-CSIC), Dept. Environmental Chemistry, c/Jordi Girona 18-26, 08034 Barcelona, Spain.
Institute of Environmental Assessment and Water Research (IDÆA-CSIC), Dept. Environmental Chemistry, c/Jordi Girona 18-26, 08034 Barcelona, Spain.
Sci Total Environ. 2018 Nov 15;642:148-154. doi: 10.1016/j.scitotenv.2018.06.032. Epub 2018 Jun 9.
Underground subways transport large numbers of citizens in big cities, which must breathe air with limited ventilation. These atmospheric conditions may enhance the concentration of air pollutants from both outdoor and indoor air. The influence of ventilation conditions and maintenance activities on the concentrations of air pollutants have been studied. Particulate matter with aerodynamic diameter smaller than 2.5 μm (PM) in indoor air was sampled in ten platforms of nine subway stations of the metropolitan area of Barcelona in 2015 and 2016. These particles were analyzed for polycyclic aromatic hydrocarbons (PAH) and organic tracer compounds. The concentrations of PAH were in the range of the street air levels with higher PAH values in the colder period. No influence of nighttime maintenance activities was observed on the platform air quality during daytime. Source apportionment analysis using the concentrations of hopanes, nicotine and levoglucosan as molecular tracer compounds showed that 75% of the detected PAH at the platforms have an outdoor PM origin. The modern subway stations, with advanced ventilation and platform screen doors that separate the subway system from the platform, showed lowest PAH and PM concentrations.
地下地铁在大城市中运输大量市民，这些市民必须呼吸通风有限的空气。这些大气条件可能会增加来自户外和室内空气的空气污染物浓度。已经研究了通风条件和维护活动对空气污染物浓度的影响。2015 年和 2016 年，在巴塞罗那大都市区的九个地铁站的十个平台上采集了室内空气中空气动力学直径小于 2.5μm 的颗粒物（PM）。对这些颗粒进行了多环芳烃（PAH）和有机示踪化合物的分析。PAH 的浓度处于街道空气水平范围内，在较冷的时期 PAH 值较高。夜间维护活动并未对白天平台上的空气质量产生影响。使用藿烷、尼古丁和左旋葡聚糖作为分子示踪化合物的浓度进行的源分配分析表明，平台上检测到的 75%的 PAH 源自户外 PM。具有先进通风和将地铁系统与平台隔开的屏蔽门的现代化地铁站显示出最低的 PAH 和 PM 浓度。
