Particulate matter concentrations in urban metro systems: Case studies and a literature review

Many experimental results round the worls have measured elevated concentrations of fine particles in underground metro systems, with significant implications for human health caused by the protacted exposition to Particulate Matter (PM). On the basis of these considerations, the aim of this research is to propose an original literature review with respect to the particulate matter concentrations (PM10 and PM2.5) both for underground and for ground-level urban metro system.