Air quality
; Quality control
; Size distribution
; Subway stations
; Ventilation
; Barcelona metro system
; Forced ventilation
; Mechanical ventilation
; Metro system
; Particle number concentration
; Single-track tunnel
; Tunnel ventilation
; Ultrafine particle
; Subways
; air quality
; atmospheric particle
; atmospheric pollution
; chemical composition
; concentration (composition)
; emission
; environmental factor
; metro system
; nitrogen
; particle size
; pollution monitoring
; size distribution
; tunnel
; ventilation
; air conditioning
; air quality
; Article
; chemical composition
; circadian rhythm
; exhaust gas
; night
; particle size
; particulate matter
; priority journal
; railway
; urban area
; Barcelona [Catalonia]
; Catalonia
; Spain
Scopus学科分类:
Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要:
An extensive air quality campaign was performed at differently designed station platforms in the Barcelona metro system, aiming to investigate the factors governing airborne particle number (N) concentrations and their size distributions. The study of the daily trends of N concentrations by different size ranges shows that concentrations of N0.3–10 are closely related with the schedule of the metro service. Conversely, the hourly variation of N0.007–10 (mainly composed of ultrafine particles) could be partly governed by the entrance of particles from outdoor emissions through mechanical ventilation. Measurements under different ventilation settings at three metro platforms reveal that the effect on air quality linked to changes in the tunnel ventilation depends on the station design. Night-time maintenance works in tunnels are frequent activities in the metro system; and after intense prolonged works, these can result in higher N concentrations at platforms during the following metro operating hours (by up to 30%), this being especially evident for N1–10. Due to the complex mixture of factors controlling N, together with the differences in trends recorded for particles within different size ranges, developing an air quality strategy at metro systems is a great challenge. When compared to street-level urban particles concentrations, the priority in metro air quality should be dealing with particles coarser than 0.3�μm. In fact, the results suggest that at narrow platforms served by single-track tunnels the current forced tunnel ventilation during operating hours is less efficient in reducing coarse particles compared to fine. � 2017 Elsevier Ltd
Institute of Environmental Assessment and Water Research (IDAEA), CSIC, C/Jordi Girona 18-26, Barcelona, Spain; School of Earth and Ocean Science, Cardiff University, Park Place, Cardiff, United Kingdom; Transports Metropolitans de Barcelona, TMB Santa Eul�lia, Av. Del Metro s/n, L'Hospitalet de Llobregat, Spain
Recommended Citation:
Reche C,, Moreno T,, Martins V,et al. Factors controlling particle number concentration and size at metro stations[J]. Atmospheric Environment,2017-01-01,156